While there is no singular definition of public health, it has broadly been defined as “the science and art of preventing disease, prolonging life, and promoting health,” and “what we do together as a society to ensure the conditions in which everyone can be healthy”. Definitions and objectives for public health have evolved over time, as it is not a static concept (see Box 1). Public health encompasses a wide variety of programs and activities, including controlling the spread of communicable disease, preventing chronic diseases, improving nutrition, improving air and water quality, promoting safer workplaces, reducing automobile accidents, and more.

The overarching focus for a public health system is to help with disease prevention, health promotion, and to close gaps in health disparities in groups of people. These groups can range from small communities to populations at the national and even global levels. Public health’s focus on health equity in groups of people can be contrasted with clinical medicine, which is mostly focused on preventing and treating illness in individuals.   

A Brief History of Public Health in the U.S.

In the United States, public health evolved as a practice and a discipline over time with roots that extend back to the early history of the nation (the first governmental public health agency, the Marine Hospital Service, was formed in 1798). As scientific understanding about causes and effective interventions for diseases improved over time, public health practices evolved and expanded across the country. The 19^th century saw a “great sanitary awakening” in the U.S., as illness came to be understood as an indicator of poor social and environmental conditions, and investments in hygiene and sanitation grew to combat disease in communities around the country, especially in large cities. After the U.S. Civil War, states began to set up boards of health to oversee growing investments and attention to public health activities in communities. The first state-level agency for public health was created in New York in 1866; Massachusetts established its first state board of health in 1869 and other states and jurisdictions followed. As the understanding of the germ theory of disease grew, state and local health departments created infectious disease laboratories in the 1890s. In the early to mid-20^th century, state and local health departments grew in size and responsibilities and many of the public health interventions and focus areas that we see today were established and expanded.

In addition, a number of milestones occurred in the 20^th century to grow the federal government’s role in public health, including new legislation such as the Food and Drug Act of 1906 (allowed federal oversight of manufacture, labeling and sale of foods) and the Sheppard-Towner Act of 1922 (authorized federal government funding of state-level public health efforts for the first time, in this case for maternal and child health programs). As part of the social welfare reforms undertaken via the “New Deal” in the 1930s and the “Great Society” in the 1960s, federal responsibilities, oversight, and funding for public health grew significantly. Many core federal departments and agencies we still have today were established during this period. From the late 1960s through today, U.S. public health efforts have experienced periods of decline and periods of growth often linked with broader social trends, changing perceptions about health threats, and economic and fiscal conditions in the country. During the first Trump administration and continuing through the Biden administration, the COVID-19 pandemic represented one of the greatest public health challenges of the last 100 years and led to an expansion of the government’s public health response. However, the expansion has proven temporary and during the second Trump administration, public health efforts face resource cuts and an uncertain future.

Public health powers and responsibilities derive from the U.S. Constitution and are shared across federal, state, and local levels of government – each of which has unique roles in such efforts that can vary state by state and even community by community. While many of public health efforts are funded and implemented through public (i.e. governmental) programs, private actors are also involved in funding and delivering public health services in the U.S. Given the many actors involved and the variations across federal, state and local roles and approaches, public health in the U.S. has often been referred to as a “patchwork” system.  

Key Public Health Frameworks, Services, Capabilities and Characteristics

Public health efforts are typically guided at the broadest level by strategies or frameworks outlining the services, capabilities and activities that help deliver on the mission to protect and promote communities’ health. A key framework for U.S. public health over the last few decades has been the 10 Essential Public Health Services (EPHS) framework, originally developed in 1994 by a federal workgroup (with input from outside experts), and updated in 2020. The EPHS highlights ten key public health service areas that include: monitoring population health status and community needs, investigating and addressing hazards and health problems, and using legal and regulatory actions to improve and protect the public’s health (see Table 1). An underlying principle of promoting equity underlies all service areas in this framework.

The “Foundational Public Health Services (FPHS)” framework is another key resource. This framework emerged from a 2013 convening of stakeholders who, in response to a recommendation from the Institute of Medicine, set out to define “a minimum package of public health capabilities and programs that no jurisdiction can be without.” The FPHS, which is now overseen by the Public Health Accreditation Board (PHAB), outlines eight “foundational capabilities” and five “foundational areas” that are central for delivering public health services to communities (see Table 2). These foundational areas include: communicable disease control, environmental public health, and maternal, child & family health, while foundational capabilities include assessment & surveillance, emergency preparedness & response, and communications.

The EPHS and FPHS frameworks overlap but are also seen as complementary, with the EPHS describing activities the public health system overall should undertake in communities, and the FPHS representing a minimum package of governmental public health activities that should be present everywhere.

Other strategies and frameworks have been formed and shaped through numerous governmental and non-governmental expert bodies and reports. Particularly influential have been recommendations and guidance from the National Academy of Medicine (previously the Institute of Medicine), which published a milestone report on the U.S. public health system in 1998 and key follow-up reports in 2002 and 2017.

In addition to these frameworks and capabilities, public health can be identified through certain defining characteristics, which include:

• Being science-based. Effective public health policies and activities draw from the best available science and evidence and are adapted and updated as new information and scientific understanding improves.
• Focusing on prevention. Ultimately, the goal of public health interventions is to prevent disease or otherwise improve health outcomes in groups of people. When public health works, the result is often the absence of disease and/or longer, healthier lives in a community. This means the benefits derived from public health interventions – disease prevented – are often unseen and hard to quantify.
• Addressing health inequities. Underlying the public health approach is a recognition that all people have an equal right to better health. However, in reality there are significant health disparities across different demographic groups and geographic areas. Therefore, public health interventions often emphasize addressing health needs in underserved, marginalized, disadvantaged, and otherwise vulnerable populations in support of health equity.

Social Determinants of Health

The health of a population can be greatly affected by non-medical factors, which would include things like educational access and quality, health care access and quality, neighborhood characteristics, social and community practices, and economic health and stability. These other, broader societal and community-wide factors are known as the “social determinants of health” (SDOH, see Figure 1). Unequal access to SDOH can feed health disparities. For example, communities that have less access to grocery stores with healthy foods face greater challenges with nutrition, which raises the risks of heart disease, diabetes, obesity and other conditions in these communities compared to others with health food options. During an epidemic or pandemic, the lack of sick leave policies and precarious economic circumstances can leave workers – especially low-wage workers – with little flexibility to take time off from work, raising their risk of infection and continuing community transmission. In general, racial and ethnic health and health care disparities can result in higher rates of illness and death for minority populations across a wide range of health conditions.

Many public health programs recognize the importance of social determinants of health, and sometimes work in partnership with other public and private efforts to help develop and implement complementary approaches aimed at improving health equity. The CDC recommends that public health departments consider how social determinants affect health in their communities, highlighting how a focus on implementing the 10 Essential Public Health Services can help address inequities that arise from these social conditions. Still, there are limits to how directly public health programs can address these issues given that they often involve broad social conditions such as employment, discrimination, housing, and education.

Source: KFF. Race, Inequality, and Health. https://www.kff.org/health-policy-101-race-inequality-and-health/?entry=table-of-contents-what-factors-drive-racial-and-ethnic-health-disparities

As indicated in the name, “public” health is primarily shaped and supported through the public sector, i.e., governments. In the U.S., public health powers and responsibilities are shared across federal, state, and local levels of government. Legal authorities for public health powers are derived from the U.S. Constitution and relevant federal, state, and local laws (see Box 2 for an overview of the legal basis for U.S. public health powers). A set of public health departments and agencies at each of these levels forms the organizational backbone of the U.S. public health system. However, many private sector actors, such as non-governmental community-based organizations, academic institutions, private companies, philanthropies, and others, also have roles in the public health system.

Federal Government

Each of the three branches of the federal government (Executive, Legislative, and Judicial) has a role in shaping and implementing public health in the U.S.

The President (Executive Branch)

Federal responsibilities and oversight of public health are spread across numerous executive branch agencies and departments overseen by the President (also see “Congress and the Executive Branch and Health Policy). The President, White House, and executive branch agencies also have the authority to set certain aspects of national public health policy, such as determining under which circumstances and for what diseases that individuals entering the U.S. may be subject to quarantine, isolation, and/or other public health measures, invoking border and migration control measures for public health issues such as those allowed under Title 42, and instituting public health controls or other measures on interstate travel and commerce.

The key federal departments and agencies involved in oversight and implementation of public health in the U.S. include:

Department of Health and Human Services (HHS) currently has 13 operating divisions and is overseen by[RS1]  a secretary, with multiple assistant secretaries responsible for specific offices and programs. For example, the Office of the Assistant Secretary of Health (OASH) oversees key HHS public health offices and regional offices, as well as the U.S. Public Health Service Commissioned Corps. Also within OASH is the Office of the Surgeon General, which has historically served as a center for expertise on many public health issues and has at times released influential reports, affecting U.S. public health policy and practice in areas such as tobacco, HIV/AIDS, and drunk driving. A reorganization of the department has been proposed, which, if enacted, would reduce the number of operating divisions and shift the organizational locations of some offices at HHS (more below). The following are the core public health-focused operating divisions within HHS:

• Centers for Disease Control and Prevention (CDC) is considered the leading public health agency of the federal government. The CDC is comprised of a central Office of the Director, nine national centers covering different areas of U.S. public health, and a center for global health. CDC houses experts, laboratories, communication services, and other capabilities directed to improve the public’s health and respond to emergencies. One of CDC’s core functions is to support state and local public health efforts through funding and technical assistance. CDC’s budget includes an annually appropriated discretionary amount provided by Congress each year (CDC’s FY2024 enacted budget for its core public health programs was $9.25 billion), and also several programs whose budget is determined by specific Congressionally-mandated program authorizations, such as the Vaccines for Children program (in FY2024 the budget for these mandatory programs totaled $8.03 billion). During outbreaks and other health emergencies, Congress has often provided additional emergency supplemental funding to support CDC response activities. CDC is led by a director, historically appointed by the President without need for Senate confirmation. Due to a law passed by Congress in December 2022, the CDC director position is a Senate-confirmed position as of January 2025.
• Food and Drug Administration (FDA) is responsible for protecting public health by ensuring the safety, efficacy, and security of human and veterinary drugs, biological products, and medical devices. FDA also works to maintain the safety of (some of) the U.S. food supply, cosmetics, and products that emit radiation. FDA review and authorization/approval is necessary for all prescription drugs and all vaccines intended for use in humans, along with many other medical products and health devices. The total program level budget at FDA (the amount of money the FDA can spend for its activities) is comprised of both Congressionally appropriated funds and user fees collected via regulatory review of many of the products under FDA’s purview. In FY2024, the FDA’s total program level budget was $7.2 billion, of which $3.3 billion (46%) came from user fees. The FDA is led by a commissioner, a Senate-confirmed position.
• Administration for Strategic Preparedness and Response (ASPR) is an operating division within HHS that leads medical and public health preparedness for, response to, and recovery from disasters and other public health emergencies. This includes activities to support development of medical countermeasures for health emergencies, a stockpile of emergency medical supplies and equipment for use during emergency responses, and support and technical assistance to state and local public health agencies to improve their response capacities. It is comprised of multiple centers, including the Center for Preparedness, the Center for Response, the Center for the Biomedical Advance Research and Development Authority (BARDA), and the Center for the Strategic National Stockpile. ASPR’s operating budget for FY2024 was $3.65 billion. ASPR is led by an Assistant Secretary for Preparedness and Response, a Senate-confirmed position.
• Other HHS Operating Divisions: Other HHS agency programs also play a role in public health, including by helping to build capacity, respond to outbreaks and serve communities, even if they may be more directly focused on clinical care and services, including HRSA’s community health center program and Ryan White HIV/AIDS Program, and SAMSHA’s programs on substance abuse and mental health.

The current Trump administration announced there will be a reorganization of these HHS operating divisions.  For example, the administration proposed to create a new agency called the Administration for a Healthy America (AHA) that would consolidate several existing HHS agencies, including OASH, HRSA, SAMHSA, and expects to place ASPR within CDC, among other changes.  

Several other departments and agencies outside of HHS play a role in promoting the nation’s public health.

These include:

• U.S. Department of Agriculture (USDA), which supports U.S. agriculture through assistance to farmers, and also oversees programs aimed at improving health, ending hunger, ensuring food safety, and other areas. USDA also protects public health through regulating aspects of the nation’s food supply and also providing food services for children and low-income people across the country. USDA’s Food Safety and Inspection Service (FSIS) regulates processors of meat, poultry, and eggs, and helps respond to foodborne disease outbreaks. The department’s Food and Nutrition Service oversees programs to provide food and nutrition education in schools as well as the Supplemental Nutrition Assistance Program (SNAP), which provides food benefits to low-income families.

• Environmental Protection Agency (EPA) helps protect human health related to environmental risks through research and regulation in areas including product safety, indoor air quality, drinking water, and aspects of food safety.

• Department of Defense (DoD) oversees programs focused on the health and safety of active-duty military members and their families, and also supports a number of public health functions such as health surveillance and emergency response.

• Department of Homeland Security (DHS) provides support to help state and local public health agencies improve preparedness and response to terrorism and other public health threats.

• Occupational Safety and Health Administration (OSHA) in the U.S. Department of Labor works to promote safe and healthy working conditions nationwide through setting and enforcing standards, and implementing training, outreach, education, and other assistance programs for worker safety.

Department of Veterans Affairs (VA) oversees programs focused on the health of military veterans and their families, including public health programs to help promote health and prevent disease in these populations.

This is not meant to be a comprehensive list; other federal agencies also have responsibilities and activities important for public health.

U.S. Congress (Legislative Branch)

Congress (the House of Representatives and the Senate) makes laws, conducts oversight of the Executive branch, and determines the level of federal spending; all roles that are relevant to the U.S. public health system. Much of the federal funding for public health is for discretionary programs rather than mandatory ones (see Funding below), so Congress must come to agreement and pass bills annually to determine how much money goes to these programs. Congress may pass additional emergency funding to states and localities for public health efforts during national emergencies, such as was done numerous times during COVID-19. Congress may also pass laws that change federal practices related to public health, such as a 2022 law that made the CDC director a Senate-confirmed position. Oversight responsibilities for public health in the legislative branch are divided across a number of different Congressional committees with jurisdiction over different aspects of public health policy, and oversight of different Executive branch agencies and departments working in public health.

Federal Courts (Judicial Branch)

U.S. federal courts, up to and including the Supreme Court, pass judgment on how or whether federal public health laws and policies can be carried out and settle disputes between the federal government, individuals, states, and private companies over how public health activities are regulated and implemented. The legal basis for many current public health practices, such as vaccination requirements, rests on federal court decisions and precedents (see Box 2). Federal courts have also weighed in on the legality of a number of federal public health policies enacted during the response to COVID-19, such the CDC masking requirement for public transportation issued in January 2021 that was challenged and ultimately overturned by a federal court in April 2022, and the COVID-19 vaccination mandate for federal workers implemented by the Biden administration in September 2021 that was ultimately rescinded after legal challenges were raised in federal courts.

State, Local, and Territorial Governments

States are given primary responsibility for many public health powers under the U.S. Constitution (see Box 1). Each of the 50 states plus Washington D.C., five U.S. territories (American Samoa, Mariana Islands, Guam, Puerto Rico, and the Virgin Islands), and three associated states (Marshall Islands, Micronesia, and Palau) has public health departments that are responsible for implementing public health programs in their jurisdictions. Funding for public health programs at the state and local levels comes from a combination of federal, state, and other sources (see funding section below).

Across States, Public Health Governance Varies

How public health is governed differs across these states and territories. Some have a very centralized governance model, where most or all parts of the state are served by local units of the state health agency and primary decision-making powers reside with state representatives. Others have a more decentralized governance structure, where most or all parts of the state are served by local public health agencies that may be independent of the state health agency. Still others have a mixed or shared approach to public health governance between the state and local decision makers. A 2022 analysis by the Association of State and Territorial Health Organizations (ASTHO) found that of the 50 states and D.C., 16 are centralized, 27 decentralized, and 8 have a mixed or shared approach to governance (See Figure 2).

This variation in governance leads to very different processes across states for how public health policy is determined and implemented. While more decentralized public health governance can result in public health programs that are more tailored to the needs of specific areas, it can also make coordinated public health action more challenging, especially during outbreaks and pandemics, as occurred during COVID-19.

Common Public Health Activities at the State Level

According to a 2022 survey conducted by ASTHO, the activities most commonly implemented by state public health agencies in 2022 included:

• communicable disease screening, prevention, and treatment, such as for HIV/AIDS and sexually transmitted diseases (all 51 state health agencies, including D.C., provide these services);
• public health surveillance such as tracking chronic and communicable diseases as well as injuries (all 51 state health agencies);
• immunization support, including managing orders and distributing vaccines for children and maintaining a childhood immunization registry (all 51 state health agencies);
• laboratory services such as foodborne illness testing and influenza virus typing (50 state health agencies, all except Kentucky).

Other very common public health activities across states include: chronic disease prevention, family planning, maternal and child health home visits, tobacco cessation and prevention programs, food safety, inspection and training programs, and cancer screenings.

Local and Tribal Health Agencies

Even as state governments have the primary mandate to oversee public health policies and programs, many public health programs within states and territories are implemented through local (such as regional, county, city, and tribal) health departments. According to the National Association of County and City Health Officials (NACCHO), over 3,300 local health agencies are responsible for implementing public health programs across the country. Depending on the governance model present in each state, these local public health departments may have more or less autonomy regarding public health in their jurisdictions. Some areas may have local boards of health authorized by state laws, which establish guidelines for the operation of public health programs at more local level jurisdictions. In addition, under U.S. law, the 574 federally recognized American Indian and Alaska Native tribes and villages have many powers of self-government, which include responsibilities for implementing public health programs. Given this varied approach across states and at the local level, the U.S. is often referred to as having a “patchwork” public health system.

Non-governmental/Community-Based Actors

Also important for public health are a wide variety of non-governmental, including community-based, actors. This includes the public health professional associations that often advocate for and represent public health practitioners, such as the aforementioned ASTHO and NACCHO, plus the Council of State and Territorial Epidemiologists (CSTE), the Association of Immunization Managers (AIM), the American Public Health Association (APHA), Trust for Americas Health (TFAH), community-based organizations, philanthropic organizations, and many others. Colleges and universities are also important: there are at least 66 schools of public health, 164 public health programs, and 29 baccalaureate public health programs at institutions of higher learning in the U.S., which support research, training, and education programs in this field. A host of private companies are important for U.S. public health functions, including pharmaceutical and medical device companies, laboratories, and many others.

Funding for public health comes primarily from government spending, which includes federal funding (both regular and supplemental appropriations) passed through to state and local governments via grants and cooperative agreements, as well as funding appropriated by state governments, and funds from city, county, district, and other local governmental sources. In addition, there may be non-governmental sources of funding for public health services, such as those from philanthropic and other private organizations. Over the last twenty years there have been periods of funding declines and growth for public health in the United States – sometimes referred to as a “boom-bust cycle” of support. For example, between 2010 and 2019, spending for state public health departments declined by 16% and spending for local public health departments declined by 18%, by some estimates. However, during the COVID-19 pandemic, public health budgets grew due to an influx of federal, state, and other response funding.

Estimating how much funding is directed to public health across the U.S. is challenging for a number of reasons. For one, there is variation across federal agencies & departments, states, and local governments on how “public health” spending is defined and how that data is collected, resulting in a lack of standardization and comparability. Second, public health programs may draw from and blend multiple sources of funding across federal, state, and local sources, making tracking and de-duplicating funding estimates challenging. Also, many public health departments, particularly at the state and local levels, have limited capacity and lack the resources and systems necessary to effectively track and report spending. Recognizing these challenges, there are sources we can look at that provide some idea about how much is spent on public health at the federal, state, and local levels:

• National public health spending estimates. One commonly cited estimate for national-level public health spending is the Centers for Medicare and Medicaid Services (CMS) Office of the Actuary’s National Health Expenditure Accounts (NHEA) data, which includes an annual Public Health Activity Estimate (PHE) for federal, and state and local spending on public health (as well as an estimate for all health spending). Figure 3 shows the PHE for federal, state and local public health spending between 2013-2023, ranging from a low of $80 billion in 2013 to a high of over $240 billion in 2020. Until 2020, these data indicated that the bulk of public health funding in the U.S. came from state and local sources. This changed during COVID-19, due to a massive increase in federal public health funding in 2020-2022 through supplemental (emergency) appropriations; the latest available data (from 2023) indicate that 3.3% of all U.S. health spending was directed to public health ($160 billion out of $4.87 trillion in total health spending). Some researchers who have studied the PHE believe it to be an overestimate of actual spending on public health.

• Individual departments and agencies. Some departments and agencies release data on how much funding they provide to public health programs nationally, which represent a subset of national public health spending amounts. For example, CDC provides annual spending data on all its grants, cooperative agreements, and emergency appropriations directed to state and local public health departments (CDC public health funding profiles). The CDC reported that it provided over $15 billion in grants to health departments across the country in FY2023, which includes funding derived from CDC’s core discretionary funds as well as mandatory funds for programs such as Vaccines for Children. The top state recipients (per capita) of CDC funds included Washington, D.C., Alaska, Maryland, and Vermont (see Figure 4).

• State-level public health funding estimates. State spending on public health budgets comes from a combination of federal, state, and other sources. According to the ASTHO, in FY2021 (the latest data available, which came during the COVID-19 pandemic response that featured significant federal supplemental appropriations), federal sources comprised the largest share of state health department budgets (53%), followed by state sources (36%) and other sources (11%, see Figure 5).

ASTHO also reports that the largest category of state public health expenditure in 2021 was COVID-19 response activities, followed by clinical care services, and women, infants, and children (WIC) programs (see Figure 6). ASTHO data from 2018 (the most recent pre-pandemic year with data available) show the largest categories of public health expenditure then were clinical services (30%) and Women, Infants and Children (WIC) programs (23%).

• Public health spending at the local (city/county/tribal) level: NACCHO reports that in 2021, local health departments drew a majority of their budgets from federal sources (55%, which included pass-throughs (26%), direct funding (25%), and Medicaid/Medicare-related sources (4%)). A further 21% came from state sources, 14% from local sources, and the remaining 10% from other sources. In 2021, NACCHO reports the mean and median annual expenditure per capita on public health by local health departments were $78 and $49, respectively.
• Funding gap estimates: One study suggests that foundational public health capacities require an overall investment of at least $32 per person per year from all levels of government but, as of 2019 (prior to the COVID-19 pandemic), investment in public health capabilities was approximately $19 per person, indicating at least a $13 gap in annual per-capita spending on public health. While funding increased significantly during the COVID-19 pandemic, much of that support is time-limited.

The public health workforce includes persons working for federal, state, and local health departments as well as those in the private sector working in community-based and voluntary organizations, hospitals and health care systems, and schools. Responsibilities for these workers can include providing health care services in public clinics, collecting and analyzing data; performing health inspections and safety monitoring at places of work, residence, and recreational facilities; developing, administering, and evaluating public health programs and policies; and providing public health education and communication services to communities, among others.

Over the last twenty years local public health departments have faced a general decline in workforce numbers in line with declines in public health budgets, with the notable exception of a rise in workforce funding due to additional federal funding (and more state and local funding) in response to the COVID-19 pandemic, although this support was time-limited. One study estimates between 2009 and 2019, the number of workers at local health departments dropped from 162,000 to 136,000, a 17% decline that translates into a loss of more than 1 worker per 10,000 residents served. Subsequently, additional funding from pandemic response led to growth in the public health workforce, even if temporarily: NACCHO estimates that in 2022 there were 182,000 public health workers at local health departments nationwide, the highest total in at least two decades. Looking specifically at the epidemiologist workforce, the Council of State and Territorial Epidemiologists (CSTE) estimates 5,706 epidemiologists worked at health departments of the 50 states and DC in 2024, which is a 38% increase over the 4,135 reported in 2021. These national numbers, however, mask an uneven distribution of the public health workforce, as rural health departments have low per-capita staffing numbers compared to large, primarily urban health departments.

Workforce retention has been an issue before, during, and after COVID-19, and is exacerbated now as pandemic-era funding expires. NACHHO and CSTE point to impending workforce losses and note that, despite the recent growth in the workforce, there is still a large gap between current staffing levels at health departments and what is needed to fully implement Foundational Public Health Services nationwide. In addition, the public health workforce faces stress, burnout, and relatively low pay, which contributes to turnover and retention issues.

The Centers for Disease Control and Prevention (CDC) has defined health communication as “the study and use of communication strategies to inform and influence individual and community decisions that enhance health.”  Public health communication encompasses a broad and long-standing field of research and practice, and in the U.S. communication is recognized as one of the ten Essential Public Health Services and one of the eight Foundational Capabilities for Public Health.

There is a history of successful implementation of communications approaches to improve the public’s health. In the 20^th century, for example, there were notable U.S. campaigns to raise awareness about the negative health effects of tobacco use, increase the use of seat belts, and improve nutrition and physical activity, all of which contributed to improved health across the country. 

However, implementing effective public health communication strategies can be difficult, especially in the context of a public health emergency such as an outbreak or pandemic. There is a history of U.S. public health authorities facing communication challenges to combat infectious disease epidemics, including HIV/AIDS and Ebola. More recently many of these same challenges, along with new ones, arose in the context of the COVID-19 pandemic response. 

At present, some key challenges for public health communication in the U.S. include:

• A “fractured” system of health communicators and sources of health information that includes governmental institutions at the global, federal, state, and local level along with private organizations and individuals, which together can produce an often overwhelming amount of information, not all of which is trustworthy;
• An evolving set of communication channels for public health information that includes traditional mass media along with a rapidly changing landscape of social media and other online communication networks;
• A marked decline in trust in health institutions and increased skepticism of expert advice in recent years, as demonstrated in KFF polling;
• The politicization of public health science and public health messaging, especially during and after the COVID-19 pandemic;
• More exposure to public health misinformation (the spread of inaccurate or false information) and disinformation (the deliberate spread of false information with the intention to mislead). 

Still, there are strategies that can help address these challenges, such as:

• Improving coordination on public health messaging among key messengers in public health;
• Collaborating with information channels such as social media companies to understand and reduce the spread of misinformation;
• Presenting and disseminating information from trusted sources through multiple channels;
• Tailoring messages to intended audiences;
• Engaging in two-way communication that encourages dialogue with members of the public and addresses questions and concerns, especially with those in the “malleable middle” who remain open to updating their opinions on health issues;
• Proactively countering misinformation and disinformation;
• Applying continual improvement strategies to learn from successes and failures in public health communication; and
• Building trusted relationships with communities by engaging consistently over time, rather than only during crises.

Case Surveillance, Reportable and Notifiable Diseases

Disease surveillance, which has been defined as the “ongoing, systematic collection, analysis, and interpretation of health-related data,” is a core function of the public health system. This includes collecting case information for diseases of importance, reporting and analyzing that information and investigating it if there is a need. In the U.S., responsibilities for public health surveillance activities are shared among state and local, federal, and private actors, just like for many aspects of public health.

Initial reports on cases of disease may originate from providers such as medical practitioners, hospitals, or laboratories. When a practitioner diagnoses and/or receives a positive lab result for certain conditions, this information is typically reported to the appropriate local and/or state health department, as determined by state disease reporting laws. Such reporting to state and local health departments is mandatory for a specific set of diseases, which are known as reportable diseases. The specific list of reportable diseases – most of which are infectious diseases that can pose a threat to public health – can differ between states, depending upon each jurisdiction’s health priorities. Reports to state/local health departments will often include some personally identifiable data on the individual(s) diagnosed, to allow public health authorities to investigate and follow-up. This way, state and local health departments can provide necessary services to affected individuals, and also use reported information to locate the source of potential new outbreaks or health threats and intervene to prevent further spread.

In turn, state and local health departments may also send de-identified data about confirmed cases of certain diseases and conditions that are tracked nationally to the CDC. This notification is voluntary — the federal government cannot require states to report diseases as that is a public health authority that rests at the state level. CDC does maintain a list of notifiable diseases that it requests state and local health departments provide through its National Notifiable Diseases Surveillance System (NNDSS). This list is updated every year using case definitions refined in collaboration between CDC and Council of State and Territorial Epidemiologists (CSTE). In 2023, for example, there were 123 reportable conditions on CDC’s notifiable diseases list.

Federal Declarations and Powers During Public Health Emergencies

The COVID-19 pandemic demonstrated how consequential public health emergencies can be. It presented the biggest challenge to the U.S. public health system and the largest public health response in a century, and it has had an effect on how public health is practiced across the country. In the event of a threat that is determined to represent a public health emergency, different components of the executive branch can make public health emergency declarations that unlock different flexibilities and resources for response purposes:

• The President can issue a national emergency declaration pursuant to Section 201 of the National Emergencies Act, which will remain in effect until terminated by the President or through a joint resolution of Congress, or if the President does not issue a continuation notice annually. Such a notice was issued by President Trump for COVID-19 and was extended by President Biden. Declaring a national emergency allows the federal government to waive certain programmatic requirements related to Medicaid and Medicare, among other provisions.
• The Secretary of HHS can declare a “public health emergency (PHE)” under Section 319 of the Public Health Service Act. A PHE lasts for 90 days and must be renewed to continue, and Congress must be notified of the declaration within 48 hours. Declaring a PHE allows the HHS Secretary the flexibility to take a number of different actions, such as: tap into emergency funds, rapidly approve grants and contracts, waive or modify requirements within health programs such as Medicare and Medicaid, adjust Medicare reimbursement policies for certain drugs, hire new temporary staff and reassign personnel, and other actions. Public health emergency declarations over the past decade have included those for COVID-19, opioids, hurricanes, wildfires, and an epidemic of Zika that began in 2016. 
• The Secretary of HHS can also make a separate emergency declaration pursuant to Section 564 of the Federal Food, Drug, and Cosmetic (FD&C) Act, which can justify the use of emergency use authorization (EUA) for medical countermeasures needed for emergency response, such as new vaccines, treatments, and/or diagnostics. The EUA mechanism facilitates the availability and use of medical countermeasures determined to be safe and effective, but have not yet been formally approved by FDA. An emergency declaration issued pursuant to Section 564 of the FD&C Act remains in effect until terminated by the HHS Secretary. 

The HHS Secretary can also declare an emergency under the Public Readiness and Emergency Preparedness (PREP) Act (pursuant to Section 319F-3 of the Public Health Service Act), which allows the Secretary to provide liability immunity for companies and other actors for their activities and products developed and implemented to respond to a public health emergency. Such a declaration was made for COVID-19 by the Trump administration and continued by the Biden administration, which provided liability protections for vaccine manufacturers, etc.

Because most public health powers reside at the state level, the federal government has limited ability to issue nationwide mandates related to public health. However, during declared emergencies, the federal government does have expanded powers to do so, though the limits to these powers have been a point of contention during and after the COVID-19 emergency declaration. Examples include:

• Mandates for federal workers or federal buildings/lands (mask mandate, vaccine mandate)
• Airline and interstate travel-related mandates (e.g., mask mandates for interstate air, train, or bus travel, contact tracing/information tracking through airlines). A 1944 statute empowers the CDC “to make and enforce such regulations as in [its] judgment are necessary to prevent the introduction, transmission, or spread of communicable diseases from foreign countries into the States . . . or from one State . . . into any other . . . State.”  However, this authority has been the subject of litigation and a federal judge issued a ruling in 2022 that ended the CDC’s mask mandate for public transport during COVID-19.
• Mandates for immigrants and international visitors (such as quarantine and isolation for incoming air passengers)

Even during emergencies, the federal government does not have the power to mandate widespread business or school closures, or vaccine mandates affecting the country’s population as a whole. State governments (and sometimes local governments), however, do have those authorities, and the federal government can make recommendations for state and local authorities to follow.

Water Fluoridation

Fluoridating water has been a long-standing public health practice in most communities across the U.S. and has been supported and recommended by the federal government for decades. The CDC considers fluoridation to be one of the most important public health interventions ever implemented. However, there has been growing scrutiny of the practice, and debates in many parts of the country about whether to continue fluoridation. Robert F. Kennedy Jr., the Secretary of Health and Human Services in the Trump administration, has long been critical of water fluoridation and has said the Trump administration will recommend that fluoride be removed from public water. Even so, key professional associations, public health experts, and many policymakers continue to support fluoridation as an important tool for improving dental health.

While the federal government does have some role in determining water fluoridation policies nationally, it does not have legal authority to require state and local communities to fluoridate their water, nor to remove fluoridation in areas where it is already policy. Instead, these decisions – just like many public health policy decisions in the U.S. – are made at the state and local levels. There are some states that require water systems of a certain size within their state to provide fluoridated water, while others leave this decision to city, county, or other officials, or leave the choice up to voters who decide via local referendums. At the same time, the federal government – specifically the Environmental Protection Agency (EPA) – does have the primary authority to set and regulate the maximum level of fluoridation in public water systems. In addition, the CDC provides recommendations about best practices for achieving public health benefits from fluoridation that communities may choose to adopt.

The public health system in the U.S. is a decentralized one, with most authorities and programs delegated to the state and local levels. This “patchwork” system can be a strength and a weakness. While it allows for tailoring public health to more local needs, it also makes more coordinated and uniform action more challenging, particularly in times of emergencies; in addition, public health services and capacity vary significantly across the country, meaning that not all communities have the same level of access and there are resulting inequities in community health status. In addition, while the COVID-19 pandemic brought more attention and funding to public health, it also brought more scrutiny and contributed to a more politicized environment concerning public health, setting up new challenges for its future, including for funding and policy.

The current Trump administration has taken a very different approach to public health compared to the Biden administration. Whereas President Biden oversaw a notable increase in public health investments and expansion of public health efforts during his presidential term, the Trump White House has implemented aggressive cuts to funding, programs, and staff at CDC, FDA, NIH and elsewhere. This includes moves to cut support for federal programs related to diversity, equity, and inclusion (DEI) and racial inequities, and those that address the health needs of LGBTQ+ people. Current HHS Secretary Kennedy stated that “nothing is going to be off limits” when it comes to policy changes at HHS, and so far, he and other staff have initiated a major reorganization, restricted NIH[RS1]  funding for health research, and requested a 25% cut in the department’s budget going forward. Vaccines, a cornerstone of public health efforts and infectious disease control, have been a target for Secretary Kennedy’s policy changes, as he announced new policies and recommendations for COVID-19 vaccines, canceled hundreds of millions of funding for mRNA vaccine research, installed anti-vaccine advocates to key staff positions, dismissed all members of a key federal vaccine advisory committee and hand-selected new members with a history of vaccine skepticism,  and vowed to change a key federal vaccine compensation program underlying the childhood vaccine market. Therefore, public health in the U.S. could be facing a turning point, and the next few years may bring continued turmoil to U.S. public health policy.

• KFF Health Information and Trust Program
• KFF Tracking Poll on Health Information and Trust: Vaccine Safety and Trust
• How Does the Department of Health and Human Services (HHS) Impact Health and Health Care?
• How Does the Federal Government Monitor Vaccine Safety?
• Water Fluoridation in the U.S.: The Federal Role in Policy and Practice
• Childhood Vaccination Rates Continue to Decline
• How HHS, FDA, and CDC Can Influence U.S. Vaccine Policy
• Measles Elimination Status: What It Is and How the U.S. Could Lose It
• State Reported Efforts to Address Health Disparities: A 50 State Review
• New Federal Support for the Public Health Workforce: Analysis of Funding by Jurisdiction
• The Future of Public Health, Institute of Medicine
• The Future of Public Health in the 21^st Century, Institute of Medicine
• Public Health 3.0: A Call to Action for Public Health to Meet the Challenges of the 21st Century, National Academies of Medicine
• Wallace M, Sharfstein JM. The Patchwork U.S. Public Health System. New England Journal of Medicine.

Michaud, J., Kates, J., Oum, S., & Rouw, A., U.S. Public Health 101. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-u-s-public-health (date accessed).

Medicare is the federal health insurance program established in 1965 under Title XVIII of the Social Security Act for people age 65 or older, regardless of income or medical history, and later expanded to cover people under age 65 with long-term disabilities. Today, Medicare provides health insurance coverage to 68 million people, including 61 million people age 65 or older and 7 million people under age 65. Medicare covers a comprehensive set of health care services, including hospitalizations, physician visits, and prescription drugs, along with post-acute care, skilled nursing facility care, home health care, hospice, and preventive services. People with Medicare can choose to get coverage under traditional Medicare or Medicare Advantage private plans.

Medicare spending comprised 13.5% of the federal budget in 2024 and 21.2% of national health care spending in 2023. Funding for Medicare comes primarily from government contributions, payroll tax revenues, and premiums paid by beneficiaries. Over the longer term, the Medicare program faces financial pressures associated with higher health care costs, growing enrollment, and an aging population.

Most people become eligible for Medicare when they reach age 65, regardless of income, health status, or medical conditions. Residents of the U.S., including citizens and permanent residents, are eligible for premium-free Medicare Part A if they have worked at least 40 quarters (10 years) in jobs where they or their spouses paid Medicare payroll taxes and are at least 65 years old. People under age 65 who receive Social Security Disability Insurance (SSDI) payments generally become eligible for Medicare after a two-year waiting period. People diagnosed with end-stage renal disease (ESRD) and amyotrophic lateral sclerosis (ALS) become eligible for Medicare with no waiting period.

Medicare covers a diverse population in terms of demographics and health status, and this population is expected to grow larger and more diverse in the future as the U.S. population ages. Currently, most people with Medicare are White, female, and between the ages of 65 and 84 (Figure 1). The share of U.S. adults who are age 65 or older is projected to grow from 17% in 2022 to nearly a quarter of the nation’s total population (24%) in 2060. Among people ages 65 and older, the share of people ages 80 and older will increase from 23% in 2022 to 34% in 2060. As the U.S. population ages, the number of Medicare beneficiaries is projected to grow by more than one-third from 68 million people in 2024 to more than 93 million people in 2060. The Medicare population will also grow more racially and ethnically diverse. By 2060, people of color will comprise 44% of the U.S. population ages 65 and older, up from a quarter in 2022.

While many Medicare beneficiaries enjoy good health, others live with health problems that affect their quality of life, including multiple chronic conditions, limitations in their activities of daily living, and cognitive impairments. In 2022, nearly half (45%) of Medicare beneficiaries had four or more chronic conditions, more than a quarter (28%) had a functional impairment, and 17% had a cognitive impairment (Figure 2).

Most Medicare beneficiaries have limited financial resources, including income and assets. In 2024, one in four Medicare beneficiaries – 16.5 million people with Medicare – lived on incomes below $24,600 per person, and half (32.9 million) of all Medicare beneficiaries lived on incomes below $43,200 per person; one in four Medicare beneficiaries had savings below $18,950 per person in 2024, while half had savings below $110,100 per person. Income among Medicare beneficiaries is generally lower for women than men, for people of color than White beneficiaries, and for beneficiaries under age 65 with disabilities than older beneficiaries (Figure 3).

Benefits. Medicare covers a comprehensive set of medical care services, including hospital stays, physician visits, and prescription drugs. Medicare benefits are divided into four parts: 

• Part A, also known as the Hospital Insurance (HI) program, covers inpatient care provided in hospitals and short-term stays in skilled nursing facilities, hospice care, post-acute home health care, and pints of blood received at a hospital or skilled nursing facility. An estimated 67.5 million people were enrolled in Part A in 2024. In 2023, 13% of beneficiaries in traditional Medicare had an inpatient hospital stay, while 7% used home health care services (which are also covered under Part B), and 3% had a skilled nursing facility stay (Figure 4). (Comparable utilization data for beneficiaries in Medicare Advantage is not available.)
• Part B,the Supplementary Medical Insurance (SMI) program, covers outpatient services such as physician visits, outpatient hospital care, and preventive services (e.g., mammography and colorectal cancer screening), among other medical benefits. An estimated 62 million people were enrolled in Part B in 2024. A larger share of beneficiaries use Part B services compared to Part A services. For example, in 2023, more than 9 in 10 (92%) traditional Medicare beneficiaries used physician and other services covered under Part B and 59% used outpatient hospital services.
• Part C, more commonly referred to as the Medicare Advantage program, allows beneficiaries to enroll in a private plan, such as a health maintenance organization (HMO) or preferred provider organization (PPO), as an alternative to traditional Medicare. Medicare Advantage plans cover all benefits under Medicare Part A, Part B, and, in most cases, Part D (Medicare’s outpatient prescription drug benefit), and typically offer extra benefits, such as dental services, eyeglasses, and hearing exams. In 2025, 34.1 million beneficiaries are enrolled in Medicare Advantage, which is 54% of Medicare beneficiaries who are eligible to enroll in Medicare Advantage plans. (See “What Is Medicare Advantage and How Is It Different From Traditional Medicare?” for additional information.) 
• Part D is a voluntary outpatient prescription drug benefit delivered through private plans that contract with Medicare, either stand-alone prescription drug plans (PDPs) or Medicare Advantage prescription drug (MA-PD) plans. In 2025, 54.8 million beneficiaries are enrolled in Part D, with 58% enrolled in MA-PDs and 42% enrolled in PDPs. In 2023, over 9 in 10 Medicare beneficiaries enrolled in Part D (93%) used prescription drugs. (See “What Is the Medicare Part D Prescription Drug Benefit?” for additional information.)

Although Medicare covers a comprehensive set of medical benefits, Medicare does not cover long-term care services. Additionally, coverage of vision services, dental care, and hearing aids is not part of the standard benefit, though most Medicare Advantage plans offer some coverage of these services.

Premiums and cost sharing. Medicare has varying premiums, deductibles, and coinsurance amounts that typically change each year to reflect program cost changes.

• Part A: Most beneficiaries do not pay a monthly premium for Part A services, but are required to pay a deductible for inpatient hospitalizations ($1,676 in 2025). (People who are working contribute payroll taxes to Medicare and qualify for premium-free Part A at age 65 based on having paid 1.45% of their earnings over at least 40 quarters.) Beneficiaries are generally subject to cost sharing for Part A benefits, including extended inpatient stays in a hospital ($419 per day for days 61-90 and $838 per day for days 91-150 in 2025) or skilled nursing facility ($209.50 per day for days 21-100 in 2025). There is no cost sharing for home health visits.
• Part B: Beneficiaries enrolled in Part B, including those in traditional Medicare and Medicare Advantage plans, are generally required to pay a monthly premium ($185 in 2025). Beneficiaries with annual incomes greater than $106,000 for a single person or $212,000 for a married couple in 2025 pay a higher, income-related monthly Part B premium, ranging from $259 to $628.90. Approximately 8% of Medicare beneficiaries with Part B coverage are expected to pay income-related Part B premiums in 2025. Part B benefits are subject to an annual deductible ($257 in 2025), and most Part B services are subject to coinsurance of 20 percent.
• Part C: In addition to paying the Part B premium, Medicare Advantage enrollees may be charged a separate monthly premium for their Medicare Advantage plan, although three-quarters (76%) of enrollees are in plans that charge no additional premium in 2025. Medicare Advantage plans are generally prohibited from charging more than traditional Medicare, but vary in the deductibles and cost-sharing amounts they charge. Medicare Advantage plans typically establish provider networks and may require higher cost sharing for services received from non-network providers.
• Part D: Part D plans vary in terms of premiums, deductibles, and cost sharing. People in traditional Medicare who are enrolled in a separate stand-alone Part D plan generally pay a monthly Part D premium unless they qualify for full benefits through the Part D Low-Income Subsidy (LIS) program and are enrolled in a premium-free (benchmark) plan. In 2025, the average enrollment-weighted premium for stand-alone Part D plans is $39 per month, substantially higher than the enrollment-weighted average monthly portion of the premium for drug coverage in MA-PDs ($7 in 2025).

Sources of coverage. Most people with Medicare have some type of coverage that may protect them from unlimited out-of-pocket costs and may offer additional benefits, whether it’s coverage in addition to traditional Medicare or coverage from Medicare Advantage plans, which are required to have an out-of-pocket cap and typically offer supplemental benefits (Figure 5). However, based on KFF analysis of data from the 2022 Medicare Current Beneficiary Survey, 3.2 million people with Medicare have no additional coverage, which places them at risk of facing high out-of-pocket spending or going without needed medical care due to costs. 

• Medicare Advantage plans now cover more than half (54%) of all Medicare beneficiaries enrolled in both Part A and Part B, or 34 million people (in 2022, Medicare Advantage enrollment was just under half of beneficiaries, or 29.9 million people). (See “What Is Medicare Advantage and How Is It Different From Traditional Medicare?” for additional information.)
• Employer and union-sponsored plans provided some form of coverage to 14.5 million Medicare beneficiaries – nearly a quarter (24%) of Medicare beneficiaries overall in 2022. Of the total number of beneficiaries with employer coverage, 9.1 million beneficiaries had this coverage in addition to traditional Medicare (31% of beneficiaries in traditional Medicare), while 5.4 million beneficiaries were enrolled in Medicare Advantage employer group plans. (These estimates exclude 5.6 million Medicare beneficiaries with Part A only in 2022, primarily because they or their spouse were active workers and had primary coverage from an employer plan and Medicare as a secondary payer.) 
• Medicare supplement insurance, also known as Medigap, covered 2 in 10 (21%) Medicare beneficiaries overall, or 42% of those in traditional Medicare (12.5 million beneficiaries) in 2022. Medigap policies, sold by private insurance companies, fully or partially cover Medicare Part A and Part B cost-sharing requirements, including deductibles, copayments, and coinsurance. 
• Medicaid, the federal-state program that provides health and long-term services and supports coverage to low-income people, was a source of coverage for 11.6 million Medicare beneficiaries with low incomes and modest assets in 2022 (19% of all Medicare beneficiaries), including 7.0 million enrolled in Medicare Advantage and 4.6 million in traditional Medicare. (This estimate is somewhat lower than KFF estimates published elsewhere due to different data sources and methods used.) For these beneficiaries, referred to as dual-eligible individuals, Medicaid typically pays the Medicare Part B premium and may also pay a portion of Medicare deductibles and other cost-sharing requirements. Most dual-eligible individuals are eligible for full Medicaid benefits, including long-term services and supports.

Medicare Advantage, also known as Medicare Part C, allows beneficiaries to receive their Medicare benefits from a private health plan, such as a health maintenance organization (HMO) or preferred provider organization (PPO). Medicare pays private insurers to provide Medicare-covered benefits (Part A and B, and often Part D) to enrollees. Virtually all Medicare Advantage plans include an out-of-pocket limit for benefits covered under Parts A and B, and most offer additional benefits not covered by traditional Medicare, such as vision, hearing, and dental. The average Medicare beneficiary can choose from 34 Medicare Advantage plans with prescription drug coverage offered by eight insurance companies in 2025. These plans vary across many dimensions, including premiums, cost-sharing requirements, out-of-pocket limits, extra benefits, provider networks, prior authorization and referral requirements, denial rates, and prescription drug coverage.

More than half of all eligible Medicare beneficiaries (54%) are currently enrolled in a Medicare Advantage plan, up from 25% in 2010 (Figure 6). The share of eligible Medicare beneficiaries in Medicare Advantage plans varies across states, ranging from 2% in Alaska to 63% in Alabama and Michigan.  Growth in Medicare Advantage enrollment is due to a number of factors. Medicare beneficiaries are attracted to Medicare Advantage due to the multitude of extra benefits, the simplicity of one-stop shopping (in contrast to traditional Medicare where beneficiaries might also purchase a Part D plan and a Medigap plan), and the availability of plans with no premiums beyond the Part B premium, driven in part by the current payment system that generates high gross margins in this market (see “How Does Medicare Pay Private Plans in Medicare  Advantage and Medicare Part D?” for additional information). Insurers market these plans aggressively, airing thousands of TV ads for Medicare Advantage during the Medicare open enrollment period. In some cases, Medicare beneficiaries have no choice but to be enrolled in a Medicare Advantage plan for their retiree health benefits as some employers are shifting their retirees into these plans; if they are dissatisfied with this option, they may have to give up retiree benefits altogether, although they would retain Medicare and have the option to choose traditional Medicare (potentially with a Medigap supplement).

There are several differences between Medicare Advantage and traditional Medicare. Medicare Advantage plans can establish provider networks, the size of which can vary considerably for both physicians and hospitals, depending on the plan and the county where it is offered. These provider networks may also change over the course of the year. Medicare Advantage enrollees who seek care from an out-of-network provider might be required to pay higher cost sharing or pay in full out of pocket for their care. In contrast, traditional Medicare beneficiaries can see any provider that accepts Medicare and is accepting new patients. In 2019, 89% of non-pediatric office-based physicians accepted new Medicare patients, with little change over time. Only 1% of all non-pediatric physicians formally opted out of the Medicare program in 2024.

Medicare Advantage plans also often use tools to manage utilization and costs, such as requiring enrollees to receive prior authorization before a service will be covered and requiring enrollees to obtain a referral for specialists or mental health providers. In 2024, virtually all Medicare Advantage enrollees were in plans that required prior authorization for some services, most often higher-cost services. Medicare Advantage insurers made nearly 50 million prior authorization determinations in 2023 (Figure 7). Prior authorization and referrals to specialists are used less frequently in traditional Medicare, with prior authorization generally applying to a limited set of services.

Medicare Advantage plans are required to use payments from the federal government that exceed their costs of covering Part A and B services (known as rebates) to provide supplemental benefits to enrollees, such as lower cost sharing, extra benefits not covered by traditional Medicare, or reducing the amount of Part B and/or Part D premiums. Examples of extra benefits include eyeglasses, hearing exams, preventive dental care, and gym memberships (Figure 8). (See “How Does Medicare Pay Private Plans in Medicare Advantage and Medicare Part D?” for a discussion of how Medicare pays Medicare Advantage plans.) Medicare Advantage plans must also include a cap on out-of-pocket spending, which provides protection from catastrophic medical expenses. Traditional Medicare does not have an out-of-pocket limit, though purchasing a Medigap policy effectively provides protection from catastrophic costs for beneficiaries in traditional Medicare. (See “What Does Medicare Cover and How Much Do People Pay for Medicare Benefits?” for a brief discussion of Medigap.)

Medicare Part D, Medicare’s voluntary outpatient prescription drug benefit, was established by the Medicare Modernization Act of 2003 (MMA) and launched in 2006. Before the addition of the Part D benefit, Medicare did not cover the cost of outpatient prescription drugs. Under Part D, Medicare helps cover prescription drug costs through private plans that contract with Medicare to offer the Part D benefit to enrollees, which is unlike coverage of Part A and Part B benefits under traditional Medicare, and beneficiaries must enroll in a Part D plan if they want this benefit.

A total of 54.8 million people with Medicare are currently enrolled in plans that provide the Medicare Part D drug benefit, including plans open to everyone with Medicare (stand-alone prescription drug plans, or PDPs, and Medicare Advantage drug plans, or MA-PDs) and plans for specific populations (including retirees of a former employer or union and Medicare Advantage Special Needs Plans, or SNPs). Nearly 6 in 10 Part D enrollees are in MA-PDs, as overall enrollment in Medicare Advantage plans has grown in recent years. Just over 13 million low-income beneficiaries receive extra help with their Part D plan premiums and cost sharing through the Part D Low-Income Subsidy Program (LIS).

For 2025, the average Medicare beneficiary has a choice of 14 stand-alone Part D plans and 34 Medicare Advantage drug plans. These plans vary in terms of premiums, deductibles and cost sharing, the drugs that are covered, any utilization management restrictions that apply, and pharmacy networks. People in traditional Medicare who are enrolled in a separate stand-alone Part D plan generally pay a monthly Part D premium unless they qualify for full benefits through the Part D LIS program and are enrolled in a premium-free (benchmark) plan. In 2025, the average enrollment-weighted premium for stand-alone Part D plans is $39 per month. In 2025, most stand-alone Part D plans include a deductible, averaging $491. Plans generally impose a tiered structure to define cost-sharing requirements and cost-sharing amounts charged for covered drugs, typically charging lower cost-sharing amounts for generic drugs and preferred brands and higher amounts for non-preferred and specialty drugs, and a mix of flat dollar copayments and coinsurance (based on a percentage of a drug’s list price) for covered drugs.

The standard design of the Medicare Part D benefit currently has three distinct phases, where the share of drug costs paid by Part D enrollees, Part D plans, drug manufacturers, and Medicare varies. Based on changes in the Inflation Reduction Act, these shares changed in 2024 and 2025 (Figure 9). Most notably, the Part D benefit now includes a $2,000 out-of-pocket spending cap, meaning Part D enrollees face no additional costs once their out-of-pocket costs exceed $2,000 in 2025. Previously, enrollees with high drug costs who did not receive low-income subsidies were responsible for paying 5% of their total drug costs when they reached the catastrophic coverage phase. This new out-of-pocket spending cap is projected to help an estimated 11 million Part D enrollees in 2025, including 6.1 million enrollees not receiving low-income subsidies.

The Inflation Reduction Act of 2022, signed into law by President Biden on August 16, 2022, includes several provisions to lower prescription drug costs for people with Medicare and reduce drug spending by the federal government, including several changes related to the Part D benefit. These provisions include (but are not limited to) (Figure 10):

• Requiring the Secretary of the Department of Health and Human Services to negotiate the price of some Part D and Part B drugs covered under Medicare. The law that established the Part D benefit included a provision known as the “noninterference” clause, which prevented the HHS Secretary from being involved in price negotiations between drug manufacturers and pharmacies and Part D plan sponsors. In addition, the Secretary of HHS does not currently negotiate prices for drugs covered under Medicare Part B (administered by physicians). To date, Medicare has completed one round of price negotiation on 10 Part D drugs, with negotiated prices available in 2026, and selected 15 more Part D drugs for price negotiation in the second round, with negotiated prices available in 2027.
• Adding a hard cap on out-of-pocket drug spending under Part D, which phased in beginning in 2024, and was limited to $2,000 in 2025 (increasing to $2,100 in 2026). As noted above, under the original design of the Part D benefit, enrollees had catastrophic coverage for high out-of-pocket drug costs, but there was no limit on the total amount that beneficiaries paid out of pocket each year.  
• Limiting the out-of-pocket cost of insulin products to no more than $35 per month in all Part D plans and in Part B and making adult vaccines covered under Part D available for free as of 2023. Until these provisions took effect, beneficiary costs for insulin and adult vaccines were subject to varying cost-sharing amounts.
• Expanding eligibility for full benefits under the Part D Low-Income Subsidy program in 2024, eliminating the partial LIS benefit for individuals with incomes between 135% and 150% of poverty. Beneficiaries who receive full LIS benefits pay no Part D premium or deductible and only modest copayments for prescription drugs until they reach the catastrophic threshold, at which point they face no additional cost sharing.
• Requiring drug manufacturers to pay a rebate to the federal government if prices for drugs covered under Part D and Part B increase faster than the inflation rate, with the initial period for measuring Part D drug price increases running from October 2022-September 2023. Previously, Medicare had no authority to limit annual price increases for drugs covered under Part B or Part D. Year-to-year drug price increases exceeding inflation are not uncommon and affect people with both Medicare and private insurance.

In 2024, Medicare was estimated to spend $464 billion on benefits covered under Part A and Part B for beneficiaries in traditional Medicare. Medicare pays providers in traditional Medicare using various payment systems depending on the setting of care (Figure 11).

Medicare relies on a number of different approaches when determining payments to providers for Part A and Part B services delivered to beneficiaries in traditional Medicare. These providers include hospitals (for both inpatient and outpatient services), physicians, skilled nursing facilities, home health agencies, and several other types of providers. Of the $464 billion in estimated spending on Medicare benefits covered under Part A and Part B in traditional Medicare in 2024, $149 billion (32%) was for hospital inpatient services and $68 billion (15%) was for hospital outpatient services, $71 billion (15%) was for services covered under the physician fee schedule, and $176 billion (38%) was for all other Part A or Part B services for beneficiaries in traditional Medicare.

Medicare uses prospective payment systems for most providers in traditional Medicare. These systems generally require that Medicare pre-determine a base payment rate for a given unit of service (e.g., a hospital stay, an episode of care, a particular service). Then, based on certain variables, such as the provider’s geographic location and the complexity of the patient receiving the service, Medicare adjusts its payment for each unit of service provided. Medicare updates payment rates annually for most payment systems to account for inflation adjustments. 

The main features of hospital, physician, outpatient, and skilled nursing facility payment systems (altogether accounting for 69% of spending on Part A and Part B benefits in traditional Medicare) are described below:

• Inpatient hospitals (acute care): Medicare pays hospitals per beneficiary discharge using the Inpatient Prospective Payment System. The rate for each discharge corresponds to one of over 770 different categories of diagnoses – called Medicare Severity Diagnosis Related Groups (MS-DRGs), which reflect the principal diagnosis, secondary diagnoses, procedures performed, and other patient characteristics. DRGs that are likely to incur more intense levels of care and/or longer lengths of stay are assigned higher payments. Medicare’s payments to hospitals also account for a portion of hospitals’ capital and operating expenses.
• Medicare also makes additional payments to hospitals in particular situations. These include additional payments for rural or isolated hospitals that meet certain criteria. Further, Medicare makes additional payments to help offset costs incurred by hospitals that are not otherwise accounted for in the inpatient prospective payment system. These include add-on payments for treating a disproportionate share (DSH) of low-income patients, as well as for covering costs associated with care provided by medical residents, known as indirect medical education (IME). While not part of the Inpatient Prospective Payment System, Medicare also pays hospitals directly for the costs of operating residency programs, known as Graduate Medical Education (GME) payments.
• Physicians and other health professionals: Medicare reimburses physicians and other health professionals (e.g., nurse practitioners) based on the Physician Fee Schedule for over 10,000 services. Payment rates for these services are based on three components: (1) clinician work, (2) practice expenses, and (3) professional liability insurance (also known as medical malpractice insurance), which are measured in terms of “relative value units” (RVUs). Each component is adjusted to account for differences across geography and then multiplied by a conversion factor. Payment rates for individual services may be updated each year based in part on the recommendations of the AMA/Specialty Society RVS Update Committee (RUC), a volunteer committee of physicians and other professionals overseen by the American Medical Association (AMA). CMS also makes annual updates to the conversion factor based on statutory factors, as well as adjustments to preserve budget neutrality, which may result in payment cuts for physicians and other clinicians whenever the projected cost of all Physician Fee Schedule spending is expected to increase by more than $20 million for the year.
• Payment rates specified under the Physician Fee Schedule are subject to further adjustments under the Quality Payment Program, established by the Medicare Access and CHIP Reauthorization Act of 2015 (MACRA). Clinicians can receive payment increases if they participate in qualified advanced alternative payment models (A-APMs), which bear some financial risk for the costs of patient care, while those who participate in the Merit-based Incentive Payment System (MIPS) may receive payment increases or decreases (or no change) depending on their performance on specific quality measures. (See “What Is Medicare Doing to Promote Alternative Payment Models?” for more information about alternative payment models in Medicare.)
• While not part of the Physician Fee Schedule, Medicare also pays for a limited number of drugs that physicians and other health care providers administer. For drugs administered by physicians, which are covered under Part B, Medicare reimburses providers based on a formula set at 106% of the Average Sales Price (ASP), which is the average price to all non-federal purchasers in the U.S, inclusive of rebates (other than rebates paid under the Medicaid program).

• Hospital outpatient departments: Medicare pays hospitals for ambulatory services provided in outpatient departments, using the Hospital Outpatient Prospective Payment System, based on the classification of individual services into Ambulatory Payment Classifications (APC) with similar characteristics and expected costs. Final determination of Medicare payments for outpatient department services is complex. It incorporates both individual service payments and payments “packaged” with other services, partial hospitalization payments, as well as numerous exceptions, such as payments for new technologies. Medicare payment rates for services provided in hospital outpatient departments are typically higher than for similar services provided in physicians’ offices, and evidence indicates that providers have shifted the billing of services to higher-cost settings. There is bipartisan interest in proposals to expand so-called “site-neutral” payments, meaning that Medicare would align payment rates for the same service across settings.
• Skilled Nursing Facilities (SNFs): SNFs are freestanding or hospital-based facilities that provide post-acute inpatient nursing or rehabilitation services. Medicare pays SNFs based on the Skilled Nursing Facility Prospective Payment System, and payments to SNFs are determined using a base payment rate, adjusted for geographic differences in labor costs, case mix, and, in some cases, length of stay. Daily rates consider six care components – nursing, physical therapy, occupational therapy, speech–language pathology services, nontherapy ancillary services and supplies, and non–case mix (room and board services).

Medicare Advantage. Medicare pays firms offering Medicare Advantage plans a set monthly amount per enrollee. The payment is determined through an annual process in which plans submit “bids” for how much they estimate it will cost to provide benefits covered under Medicare Parts A and B for an average beneficiary. The bid is compared to a county “benchmark”, which is the maximum amount the federal government will pay for a Medicare Advantage enrollee and is a percentage of estimated spending in traditional Medicare in the same county, ranging from 95 percent in high-cost counties to 115 percent in low-cost counties. When the bid is below the benchmark in a given county, plans receive a portion of the difference (the “rebate”), which they must use to lower cost sharing, pay for extra benefits, or reduce enrollees’ Part B or Part D premiums. Payments to plans are risk adjusted, based on the health status and other characteristics of enrollees, including age, sex, and Medicaid enrollment. In addition, Medicare adopted a quality bonus program that increases the benchmark for plans that receive at least four out of five stars under the quality rating system, which increases plan payments.

Generally, Medicare pays more to private Medicare Advantage plans for enrollees than their costs would be in traditional Medicare. The Medicare Payment Advisory Commission (MedPAC) reports that while it costs Medicare Advantage plans 83% of what it costs traditional Medicare to pay for Medicare-covered services, plans receive payments from CMS that are 120% of spending for similar beneficiaries in traditional Medicare, on average. The higher spending stems from features of the formula used to determine payments to Medicare Advantage plans, including setting benchmarks above traditional Medicare spending in half of counties and higher benchmarks due to the quality bonus program, resulting in bonus payments of at least $12.7 billion in 2025. This amount is four times greater than spending on bonus payments in 2015 (Figure 12).

The higher spending in Medicare Advantage is also related to the impact of coding intensity, where Medicare Advantage enrollees look sicker than they would if they were in traditional Medicare, resulting in plans receiving higher risk adjustments to their monthly per person payments, translating to an estimated $84 billion in excess payments to plans in 2025.

Higher payments to Medicare Advantage plans allow them to offer extra benefits attractive to enrollees. However, these benefits come at a cost to all beneficiaries through higher Part B premiums – amounting to $13 billion in 2025 alone – and contribute to the strain on the Medicare Part A Hospital Insurance Trust Fund. (See “How Much Does Medicare Spend and How Is the Program Financed?” for additional information .)

Medicare Part D. Medicare pays Part D plans, both stand-alone prescription drug plans and Medicare Advantage plans that offer drug coverage, based on an annual competitive bidding process. Plans submit bids yearly to Medicare for their expected costs of providing the drug benefit plus administrative expenses. Plans receive a direct subsidy per enrollee, which is risk-adjusted based on the health status of their enrollees, plus reinsurance payments from Medicare for the highest-cost enrollees and adjustments for the low-income subsidy (LIS) status of their enrollees. (Unlike Medicare Advantage, there is no quality bonus program that provides higher payments to Part D plans with higher Part D quality ratings.) Risk-sharing arrangements with the federal government (“risk corridors”) limit plans’ potential total losses or gains.

Under reinsurance, Medicare subsidizes 20% of total drug spending incurred by Part D enrollees with relatively high drug spending above the catastrophic coverage threshold, as of 2025, down from 80% in prior years, based on a provision of the Inflation Reduction Act. This provision was designed to shift more of the responsibility for catastrophic drug costs to Part D plans and drug manufacturers. Plans now pay 60% of total drug costs above the catastrophic threshold, up from 15% to 20% in prior years. (See “What Is the Medicare Part D Prescription Drug Benefit?” for more detail on plan liability under various phases of the Part D benefit and more information on changes to Part D included in the Inflation Reduction Act.) In the aggregate, Medicare’s reinsurance payments to Part D plans in 2025 are estimated to account for 18% of total Part D spending, down from close to half of total Part D spending (46%) in 2024 (Figure 13).

For 2025, Medicare’s actuaries estimate that Part D plans will receive direct subsidy payments averaging $1,855 per enrollee overall, $1,313 for enrollees receiving the LIS, and $517 in reinsurance payments for very high-cost enrollees.

While Medicare has traditionally paid providers on a fee-for-service basis, the program is implementing various alternative payment models designed to tie payments under traditional Medicare to provider performance on quality and spending. Although the overarching goals of these various models are similar—improving the quality and affordability of patient care, increasing coordination between care teams, and reducing health care costs—the specific aims vary by model.

A notable example of an alternative payment model within Medicare is the Medicare Shared Savings Program (MSSP), a permanent accountable care organization (ACO) program in traditional Medicare established by the Affordable Care Act (ACA) that offers financial incentives to providers for meeting or exceeding savings targets and quality goals. ACOs are groups of doctors, hospitals, and other health care providers who voluntarily form partnerships to collaborate and share accountability for the quality and cost of care delivered to their patients. The MSSP currently offers different participation options to ACOs, allowing these organizations to share in savings only or both savings and losses, depending on their level of experience and other factors.

ACOs have a defined patient population for the purpose of calculating annual savings or losses. Beneficiaries in traditional Medicare may choose to align themselves to an ACO (voluntary alignment) or may be assigned to a particular ACO based on where they received a plurality of their primary care services. In either case, beneficiaries are free to seek treatment from any provider who accepts Medicare and are not limited to ACO-affiliated providers. This contrasts with enrollment in Medicare Advantage, where beneficiaries are generally limited to seeing providers in their plan’s network or face higher out-of-pocket costs for seeing out-of-network providers.

In 2023, the Medicare Shared Savings Program saved Medicare an estimated $2.1 billion relative to annual spending targets. As of 2025, there are 476 MSSP ACOs nationwide, with over 643,000 participating clinicians and 10.8 million beneficiaries aligned to MSSP ACOs (Figure 14).

The ACA also established the Center for Medicare and Medicaid Innovation (CMMI, also known as the Innovation Center), an operating center within the Centers for Medicare & Medicaid Services tasked with designing and testing alternative payment models to address concerns about rising health care costs, quality of care, and inefficient spending within the Medicare, Medicaid, and CHIP programs. Since its start in 2010, CMMI has launched more than 80 models across six different categories, including accountable care models, disease-specific models, health plan models, and others (Figure 15). CMMI models are designed to be tested over a limited number of years, but Congress gave CMMI the authority to expand models nationwide permanently if they meet certain quality and savings criteria. As of the most recent estimate, six models have shown statistically significant savings, and four have met the requirements for permanent expansion into the wider Medicare program, including the Medicare Diabetes Prevention Program and the Home Health Value-Based Purchasing Model.

While the overall aims of CMMI are set in law, changes of administration have brought about changes in the strategic direction of the Innovation Center and the types of models that have been pursued, along with the reframing or termination of certain models from the previous administration. For example, the Biden administration placed a greater emphasis on health equity in CMMI models, while the second Trump administration is prioritizing evidence-based preventive care, empowering consumers with data and information to make health decisions, and promoting choice and competition in health care markets.

According to the Congressional Budget Office (CBO), the activities of CMMI increased federal spending by $5.4 billion from 2011 to 2020, which CBO attributes in part to the mixed success of many models at generating sufficient savings to offset their high upfront costs. (CBO had initially projected that CMMI would reduce federal spending by $2.8 billion in its first decade of operation.) However, evidence suggests that savings vary by model type, with the greatest savings found among state and community-based models. Further, a review of select CMMI models provides evidence of improvements in care coordination, team-based care, and other care delivery changes, even in the absence of savings. CBO projects that CMMI’s activities will come closer to the breakeven point regarding federal spending over the course of the current decade (2024-2033).

Spending. Medicare plays a significant role in the health care system, accounting for 21% of total national health spending in 2023, a quarter of spending on both hospital care and physician and clinical services, and 32% of spending on retail prescription drug sales (Figure 16).

In 2024, Medicare spending, net of income from premiums and other offsetting receipts, totaled $910 billion and accounted for 13% of the federal budget — a similar share as spending on Medicaid, the ACA, and the Children’s Health Insurance Program combined, and defense spending (Figure 17).

In 2025, Medicare benefit payments are estimated to total $1.1 trillion, up from $632 billion in 2015 (including spending for Part A, Part B, and Part D benefits in both traditional Medicare and Medicare Advantage). Medicare spending per person has also grown, increasing from $5,800 to $16,700 between 2000 and 2023 – or 4.7% average annual growth over the 23-year period. In recent years, however, growth in spending per person has been lower in Medicare than in private health insurance .

Spending on Medicare Part A benefits (mainly hospital inpatient services) has decreased as a share of total Medicare spending over time as care has shifted from inpatient to outpatient settings, leading to an increase in spending on Part B benefits (including physician services, outpatient services, and physician-administered drugs). Spending on Part B services now accounts for the largest share of Medicare benefit spending (50% in 2024) (Figure 18). Moving forward, Medicare spending on physician services and other services covered under Part B is expected to grow to more than half of total Medicare spending by 2034, while spending on hospital care and other services covered under Part A is projected to decrease further as a share of the total.

Payments to Medicare Advantage plans for Part A and Part B benefits tripled as a share of total Medicare spending between 2014 and 2024, from $156 billion to $462 billion, partly due to steady enrollment growth in Medicare Advantage plans. Growth in spending on Medicare Advantage also reflects that Medicare pays more to private Medicare Advantage plans for enrollees than their costs in traditional Medicare, on average. (See “How Does Medicare Pay Private Plans in Medicare Advantage and Medicare Part D?” for additional information.) These higher payments have contributed to growth in spending on Medicare Advantage and overall Medicare spending. In 2024, half of all Medicare program spending for Part A and Part B benefits was for Medicare Advantage plans, up from just under 30% in 2014. Between 2024 and 2034, Medicare Advantage payments are projected to total close to $9 trillion, $2.5 trillion more than spending under traditional Medicare (Figure 19).

Financing. Medicare funding, which totaled $1.1 trillion in 2024, comes primarily from governmnet contributions (44%), payroll tax revenues (35%), and premiums paid by beneficiaries (15%). Other sources include taxes on Social Security benefits, payments from states, and interest.

The different parts of Medicare are funded in varying ways, and revenue sources dedicated to one part of the program cannot be used to pay for another part (Figure 20).

• Part A, which covers inpatient hospital stays, skilled nursing facility (SNF) stays, some home health visits, and hospice care, is financed primarily through a 2.9% tax on earnings paid by employers and employees (1.45% each). Higher-income taxpayers (more than $200,000 per individual and $250,000 per couple) pay a higher payroll tax on earnings (2.35%). Payroll taxes accounted for 88% of Part A revenue in 2024.
• Part B, which covers physician visits, outpatient services, preventive services, and some home health visits, is financed primarily through a combination of government contributions (72% in 2024) and beneficiary premiums (26%) (and 2% from interest and other sources). The standard Part B premium that most Medicare beneficiaries pay is calculated as 25% of annual Part B spending, while beneficiaries with annual incomes over $106,000 per individual or $212,000 per couple pay a higher, income-related Part B premium reflecting a larger share of total Part B spending, ranging from 35% to 85%.
• Part D, which covers outpatient prescription drugs, is financed primarily by government contributions (75%) and beneficiary premiums (13%), with an additional 12% of revenues coming from state payments for beneficiaries enrolled in both Medicare and Medicaid. Higher-income enrollees pay a larger share of the cost of Part D coverage, as they do for Part B.
• The Medicare Advantage program (sometimes referred to as Part C) does not have its own separate revenue sources. Funds for Part A benefits provided by Medicare Advantage plans are drawn from the Medicare HI trust fund. Funds for Part B and Part D benefits are drawn from the Supplementary Medical Insurance (SMI) trust fund. Beneficiaries enrolled in Medicare Advantage plans pay the Part B premium and may pay an additional premium if required by their plan. In 2025, 76% of Medicare Advantage enrollees pay no additional premium.

Measuring the level of reserves in the Medicare Hospital Insurance trust fund, out of which Part A benefits are paid, is a common way of measuring Medicare’s financial status. Each year, Medicare’s actuaries provide an estimate of the year when the reserves are projected to be fully depleted. In 2025, the Medicare Trustees projected sufficient funds would be available to pay for Part A benefits in full until 2033, 8 years from now – three years earlier than the 2024 projection. At that point, in the absence of Congressional action, Medicare will be able to pay 89% of costs covered under Part A using payroll tax revenues. At the same time, the Congressional Budget Office has recently updated its projection of the Part A trust fund, extending the year of trust fund depletion to 2052, based on changes in its projections of Part A spending and revenues and a change in CBO’s modeling related to graduate medical education payments. OACT projects both lower income and higher spending under Part A than CBO, as well as faster Part A spending growth, which helps to account for the difference in the projected HI trust fund depletion dates.

Since 2010, the projected year of trust fund reserve depletion, based on projections by Medicare’s actuaries, has ranged from 5 years out (in 2021) to 19 years out (in 2010) (Figure 21).

The level of reserves in the Part A Trust Fund is affected by growth in the economy, which affects revenue from payroll tax contributions, health care spending and utilization trends, and demographic trends: an increasing number of beneficiaries as the population ages, especially between 2010 and 2030 when the baby boom generation reaches Medicare eligibility age, and a declining ratio of workers per beneficiary making payroll tax contributions. 

Part B and Part D do not have financing challenges similar to Part A, because both are funded by beneficiary premiums and government contributions that are set annually to match expected outlays. However, future increases in spending under Part B and Part D will require increases in government (and taxpayer) funding and higher premiums paid by beneficiaries.

Looking to the future, Medicare faces a number of challenges from the perspective of beneficiaries, health care providers and private plans, and the federal budget. These include:

• How best to address the fiscal challenges arising from an aging population and increasing health care costs through spending reductions and/or revenue increases.
• Whether and how to improve coverage for Medicare beneficiaries, including an out-of-pocket limit in traditional Medicare, enhanced financial support for lower-income beneficiaries, and additional benefits, such as dental and vision.
• How to control spending while ensuring fair and adequate payments to hospitals, physicians and other providers, and Medicare Advantage plans, including whether and how to reduce overpayments to Medicare Advantage plans.
• How to address the implications for traditional Medicare of the predominant role that Medicare Advantage now plays in covering Medicare beneficiaries.

Any potential changes to Medicare to address these challenges could have implications for federal spending and taxpayers, the solvency of the Medicare Hospital Insurance trust fund, total health care spending, the affordability of health care for Medicare’s growing number of beneficiaries, many of whom have limited incomes, and access to high-quality medical care.

• What to Know about Medicare Spending and Financing
• A Current Snapshot of the Medicare Part D Prescription Drug Benefit
• Medicare Advantage in 2025: Enrollment Update and Key Trends 
• Key Facts About Medicare Part D Enrollment, Premiums, and Cost Sharing in 2025 
• What to Know about the Medicare Open Enrollment Period and Medicare Coverage Options
• Explaining the Prescription Drug Provisions in the Inflation Reduction Act
• A Snapshot of Sources of Coverage Among Medicare Beneficiaries
• Medicare Advantage Quality Bonus Payments Will Total at Least $12.7 Billion in 2025
• FAQs about the Inflation Reduction Act’s Medicare Drug Price Negotiation Program
• How Many Physicians Have Opted Out of the Medicare Program?
• The Facts About Medicare Spending
• Medicare Part D in 2025: A First Look at Prescription Drug Plan Availability, Premiums, and Cost Sharing
• Medicare Advantage 2025 Spotlight: A First Look at Plan Offerings 
• Income and Assets of Medicare Beneficiaries
• What to Know About How Medicare Pays Physicians 
• Medicare Advantage Insurers Made Nearly 50 Million Prior Authorization Determinations in 2023 
• Implementation Dates for 2025 Reconciliation Law 
• Health Provisions in the 2025 Reconciliation Law 

Cubanski, J., Freed, M., Ochieng, N., Cottrill, A., Fuglesten Biniek, J., & Neuman, T., Medicare 101. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-medicare/ (date accessed).

Medicaid is the primary program providing comprehensive coverage of health and long-term care to about 80 million low-income people in the United States. Medicaid accounts for nearly one-fifth of health care spending (and over half of spending for long-term care) and a large share of state budgets. Medicaid is jointly financed by states and the federal government but administered by states within broad federal rules. Because states have the flexibility to determine what populations and services to cover, how to deliver care, and how much to reimburse providers, there is significant variation across states in program spending and the share of people covered by the program.  Changes to Medicaid and the Affordable Care Act included in the tax and spending budget reconciliation law enacted in July 2025 are expected to reduce federal Medicaid spending by $911 billion over 10 years and reduce the number of people with health insurance by 10 million (three-quarters of which stems from the cuts to Medicaid).

Medicaid is the primary program providing comprehensive coverage of health care and long-term care to about 80 million low-income people in the United States. Medicaid accounts for nearly one-fifth of health care spending (and half of spending for long-term care) and a large share of state budgets (Figure 1).

Subject to federal standards, states administer Medicaid programs and have flexibility to determine what populations and services to cover, how to deliver care, and how much to reimburse providers. States can obtain Section 1115 waivers to test and implement approaches that differ from what is required by federal statute if the Secretary of Health and Human Services (HHS) determines the waivers would advance program objectives. Because of this flexibility, there is significant variation across state Medicaid programs, and, as a result, the share of state residents covered by the program (Figure 2).

Title XIX of the Social Security Act and a large body of federal regulations and sub-regulatory guidance govern the program, defining federal Medicaid requirements and states’ options and authorities. At the federal level, the Centers for Medicare and Medicaid Services (CMS) within the Department of Health and Human Services (HHS) administers Medicaid and oversees states’ programs. States may choose to participate in Medicaid, but if they do, they must comply with core federal requirements. Not all states opted to participate in Medicaid immediately after its enactment in 1965, but by the 1980s, all states had opted in. Medicaid coverage was historically tied to cash assistance—either Aid to Families with Dependent Children (AFDC) or federal Supplemental Security Income (SSI). Over time, Congress expanded federal minimum requirements and provided new coverage requirements and options for states, especially for children, pregnant women, and people with disabilities. In 1996, legislation replaced Aid to Families with Dependent Children with Temporary Assistance to Needy Families (TANF) and severed the link between Medicaid eligibility and cash assistance for children, pregnant women, and low-income parents. The Children’s Health Insurance Program (CHIP) was established in 1997 to cover low-income children above the cut-off for Medicaid with an enhanced federal match rate (Figure 3).

In 2010, the Affordable Care Act (ACA) expanded Medicaid to nearly all nonelderly adults with income up to 138% FPL ($21,597 annually for an individual in 2025) through a new coverage pathway for parents with incomes above states’ mandatory eligibility levels for parents/caretakers and adults without dependent children who had traditionally been excluded from Medicaid coverage. However, the ACA Medicaid expansion coverage is effectively optional for states because of a 2012 Supreme Court ruling. As of July 2025, 41 states, including Washington, D.C., have expanded Medicaid (Figure 4). States receive a higher rate of federal matching funding for people who are enrolled through the expansion coverage pathway. Under the ACA, all states were also required to modernize and streamline Medicaid eligibility and enrollment processes to help individuals obtain and maintain coverage.

The COVID-19 pandemic profoundly affected Medicaid spending and enrollment. At the start of the pandemic, Congress enacted legislation that included a requirement that Medicaid programs keep people continuously enrolled in exchange for enhanced federal funding. As a result, Medicaid/CHIP enrollment grew substantially, and the uninsured rate dropped. The unwinding of these provisions started on April 1, 2023, and millions were disenrolled from Medicaid; however, Medicaid enrollment remains higher than prior to the start of the pandemic in February 2020.

Passage of the tax and spending reconciliation budget bill in July 2025 included significant changes to Medicaid that are expected to reduce federal Medicaid funding and reduce Medicaid enrollment over the next 10 years relative to what would have been expected under current law. For the first time, the law conditions Medicaid eligibility for Medicaid expansion enrollees on meeting work and reporting requirements.  These work requirements, which will go into effect on January 1, 2027, or sooner at state option, represent the largest source of federal Medicaid funding reductions and the largest source of enrollment declines in the law. The law makes other changes. Beyond work requirements, the largest cuts to Medicaid stem from provisions that would: reduce and limit provider taxes, a mechanism that nearly all states use to finance the state share of Medicaid; reduce the payments states require managed care organizations to make to health care providers (“state-directed payments”); delaying enforcement of certain provisions in the Biden administration’s rules simplifying Medicaid eligibility and renewal processes; and increasing frequencies of eligibility redeterminations for expansion enrollees. Combined, those changes and work requirements account for nearly 90% of the expected cuts in federal spending according to the Congressional Budget Office (CBO).

States are guaranteed federal matching dollars without a cap for qualified services provided to eligible enrollees. The match rate for most Medicaid enrollees is determined by a formula in the law that provides a match of at least 50% and provides a higher federal match rate for states with lower per capita income (Figure 5). States may receive a higher match rate for certain services and populations. The ACA expansion group is financed with a 90% federal match rate, so states pay 10%, and the American Rescue Plan Act included an additional temporary fiscal incentive to states that newly adopt the Medicaid expansion; however, the tax and spending law eliminated the incentive, effective January 1, 2026. In FY 2023, Medicaid spending totaled $880 billion of which 69% was federal spending. Medicaid spending growth typically accelerates during economic downturns as enrollment increases. Spending growth also peaked after the implementation of the ACA and, more recently, due to enrollment growth tied to the pandemic-related continuous enrollment provision.

Overall, Medicaid accounts for a large share of most states’ budgets and is often central to state fiscal decisions; however, state spending on Medicaid is second to state spending on elementary and secondary education, and the program is also the largest source of federal revenue for states. In state fiscal year 2023, Medicaid accounted for 30% of total state expenditures, 15% of expenditures from state funds (general funds and other funds), and 57% of expenditures from federal funds received by the state.

Social Security, Medicare , and Medicaid are the three main entitlement programs, accounting for 41% of all federal outlays in FFY 2024. Of these three programs, Medicaid is the smallest in terms of federal outlays, though it covers more people than Medicare or Social Security. Overall, federal spending on domestic and global health programs and services accounted for 29% of net federal outlays in FFY 2023, including spending on Medicare (13%), Medicaid and CHIP (10%), and other health spending (6%). Dating back to the 1980s, there have been efforts to limit federal financing for Medicaid either through a block grant to states or through a cap on spending per enrollee as a way to help reduce federal spending. Such efforts could shift costs to states, forcing them to make tough choices about whether to pay for the federal cuts, which would require higher taxes or reductions in non-Medicaid state spending, or to reduce Medicaid spending by limiting Medicaid eligibility, covering fewer benefits, or paying less to providers. Although early discussions over the tax and spending law included proposals that would have reduced the federal Medicaid match rate and imposed a cap on per-enrollee spending, these changes to Medicaid financing were not included in the final version of the bill that passed.

Medicaid is an entitlement, meaning individuals who meet eligibility requirements are guaranteed coverage. The federal government sets minimum eligibility standards, but states may expand coverage beyond these minimum requirements.  Federal minimum eligibility levels for children and pregnant individuals are set at 133% of the federal poverty level (FPL) with a mandatory 5 percentage point income disregard or effectively 138% FPL ($36,777 for a family of 3 in 2025); however, median eligibility levels for these groups were 255% FPL for children and 213% FPL for pregnant individuals as of January 2025. As a result of the ACA, the median coverage level for parents and adults without dependent children is 138% FPL, but for states that have not adopted the ACA expansion, the median eligibility for parents was 33% FPL. In non-expansion states, adults without dependent coverage are not eligible for Medicaid coverage and those with incomes below the FPL fall into the coverage gap.

Medicaid coverage is also available to certain individuals who qualify on the basis of being age 65 and older or having a disability. These coverage categories are referred to as “non-MAGI” pathways because they do not use the Modified Adjusted Gross Income (MAGI) financial methodology that applies to pathways for pregnant people, parents, and children with low incomes. In addition to considering advanced age, disability status, and income, many non-MAGI pathways also have asset limits. Medicaid generally covers individuals who qualify for Supplemental Security Income (SSI), but nearly all other non-MAGI pathways are optional, resulting in substantial state variation.  Each group has different rules about income and assets, making eligibility complex (Figure 6).

Medicaid coverage is limited for immigrants, and except for emergency services, Medicaid coverage is not available for undocumented immigrants. A number of states, however, use state funds to provide coverage to all or some undocumented immigrants.

While Medicaid covers 1 in 5 people living in the United States, Medicaid is a particularly significant source of coverage for certain populations. In 2023, Medicaid covered 4 in 10 children, 8 in 10 children in poverty,  1 in 6 nonelderly adults, and 6 in 10 nonelderly people in poverty. Relative to White children and adults, Medicaid covers a higher share of Black, Hispanic, and American Indian or Alaska Native (AIAN) children and adults. Medicaid covers over 1 in 3 people with disabilities overall (4 in 10 people with disabilities ages 19-64), who are defined as having one or more difficulty related to hearing, vision, cognition, ambulation, self-care, or independent living (Figure 7).

Medicaid provides coverage for a number of special populations.  For example, Medicaid covers 41% of all births in the United States, 42% of children with special health care needs, 5 in 8 nursing home residents, 29% of non-elderly adults with any mental illness, and 40% of non-elderly adults with HIV. Medicaid pays Medicare premiums and often provides wraparound coverage for services not covered by Medicare (like most long-term care) for nearly 1 in 5 Medicare beneficiaries (13 million).  Medicaid is a key source of coverage for individuals experiencing homelessness and those transitioning out of carceral settings, particularly in states that have adopted the Medicaid expansion.

Among the non-elderly covered by Medicaid, nearly half are children under age 19, 6 in 10 are people of color, 57% are female, and three-quarters are in a family with a full- or part-time worker. Even though most adult Medicaid enrollees are working, many do not have an offer of employer-sponsored coverage, or it is not affordable.

Medicaid covers a broad range of services to address the diverse needs of the populations it serves. In addition to covering the services required by federal Medicaid law, all states elect to cover at least some services that are not mandatory (Figure 8). All states cover prescription drugs, and most states cover physical therapy, eyeglasses, and dental care. Medicaid provides comprehensive benefits for children, known as Early Periodic Screening Diagnosis and Treatment (EPSDT) services. EPSDT is especially important for children with disabilities because it allows children access to a broader set of benefits to address complex health needs than what is traditionally covered by private insurance. Unlike commercial health insurance and Medicare, Medicaid also covers non-emergency medical transportation, which helps enrollees get to appointments, and long-term care, including nursing home care and many home care services (also known as home and community-based services, or HCBS). Coverage for long-term care is mandatory for nursing facilities, but most coverage of home care is optional. In recent years, states have expanded coverage of behavioral health services and benefits to help enrollees address social determinants of health (SDOH) like nutrition or housing.

Most people age 65 and older and many people under age 65 with disabilities have Medicare, but Medicare does not cover most LTC; instead, Medicaid is the primary payer for LTC. LTC encompasses the broad range of paid and unpaid medical and personal care services that assist with activities of daily living (such as eating, bathing, and dressing) and instrumental activities of daily living (such as preparing meals, managing medication, and housekeeping). They are provided to people who need such services because of aging, chronic illness, or disability. These services include nursing facility care, adult daycare programs, home health aide services, personal care services, transportation, and supported employment. They may be provided over several weeks, months, or years, depending on an individual’s health care coverage and level of need. There have been longstanding challenges finding enough workers to provide LTC for all people who need such services, and the COVID-19 pandemic exacerbated those issues considerably. As the population ages and advances in medicine and technology enable people with serious disabilities to live longer, the number of people in need of LTC is expected to grow.

In 2024, the median annual costs of care in the U.S. were $127,750 for a private room in a nursing home, $70,800 for an assisted living facility, and $77,792 for a home health aide. Medicare provides home health and skilled nursing facility care under specific circumstances, but the Medicare benefit is considered “post-acute” care and generally not available for people needing services on an ongoing basis. Medicaid plays a key role in access to LTC for people who qualify because LTC costs are difficult for most people to afford when paying out-of-pocket. In some cases, people only qualify for Medicaid after exhausting their savings on the costs of LTC. In 2023, Medicaid paid 61% of the $459 billion spent on LTC in the U.S. (Figure 9).

LTC may be provided in various settings broadly categorized as institutional or non-institutional. Institutional settings include nursing facilities and intermediate care facilities for people with intellectual disabilities. Services provided in non-institutional settings are known as home care (also known as home and community-based services, or HCBS), and these settings may include a person’s home, adult day care centers, assisted living settings, and group homes. Federal Medicaid statutes require states to cover institutional LTC and home health, but nearly all home care is optional. Even without a mandate to cover home care, Medicaid LTC spending has shifted from institutional to non-institutional settings over time. In 2023, most spending for LTC in the U.S. was for home care (Figure 9). That shift reflects beneficiary preferences for receiving care in non-institutional settings and requirements for states to provide services in the least restrictive setting possible stemming from the Olmstead decision. In 2023, there were 6.3 million people who used Medicaid LTC, of which 4.9 million (77%) used home care and 1.4 million (23%) used institutional care (Figure 10). While overall, over three-quarters of people who used Medicaid LTC exclusively used home care services, the share varied across states (Figure 10).  To qualify for coverage of LTC under Medicaid, people must meet state-specific eligibility requirements regarding their levels of income, wealth, and functional limitations.

Managed care is the dominant delivery system for Medicaid enrollees with 75% of Medicaid beneficiaries enrolled in comprehensive managed care organizations (MCOs). Medicaid MCOs provide comprehensive acute care and, in some cases, LTC to Medicaid beneficiaries and are paid a set per member per month payment for these services. In FFY 2023, payments to managed care and health plans accounted for the largest share (55%) of Medicaid spending, with capitated payments to comprehensive MCOs accounting for 52% of Medicaid spending and payments to other Medicaid managed care (e.g., primary care case management (PCCM) arrangements or specialty plans) accounting for another 3% (Figure 11). Smaller shares of total Medicaid spending in FFY 2023 were for fee-for-service acute care (21%), fee-for-service LTC (19%), Medicaid spending for Medicare premiums on behalf of enrollees who also have Medicare (3%), and disproportionate share hospital (DSH) payments (2%).

Medicaid spending is driven by multiple factors, including the number and mix of enrollees, their use of health care and long-term care, the prices of Medicaid services, and state policy choices about benefits, provider payment rates, and other program factors. During economic downturns, enrollment in Medicaid grows, increasing state Medicaid costs while state tax revenues are declining. Due to the federal match, as spending increases during economic downturns, so does federal funding. During the pandemic-induced recession and the two economic downturns prior to the pandemic, Congress enacted legislation that temporarily increased the federal share of Medicaid spending to provide increased support for states to help fund Medicaid. High enrollment growth rates, tied first to the Great Recession, then ACA implementation, and later the pandemic, were the primary drivers of total Medicaid spending growth over the last two decades (Figure 12).

People eligible based on being age 65 or older or based on a disability comprise about 1in 5 enrollees but account for more than half of Medicaid spending, reflecting high health care needs and in many cases, use of LTC (Figure 13).

Across the states, spending per full-benefit enrollee ranged from a low of $4,780 in Alabama to $12,295 in the District of Columbia in 2023. Variation in spending across the states reflects considerable flexibility for states to design and administer their own programs – including what benefits are covered and how much providers are paid — and variation in the health and population characteristics of state residents. Within each state, there is also substantial variation in the average costs for each eligibility group, and within each eligibility group, per-enrollee costs may vary significantly, particularly for individuals eligible based on disability (Figure 14).

In 2023, people who used Medicaid LTC comprised 6% of Medicaid enrollment but 36% of federal and state Medicaid spending (Figure 15). High per-person Medicaid spending among enrollees who use LTC likely reflects the generally high cost of LTC and more extensive health needs among such groups that lead to higher use of other health care services and drugs as well.

As of July 2024, 42 states (including Washington, D.C.) contract with comprehensive, risk-based managed care plans – often administered by private insurance companies – to provide care to at least some of their Medicaid beneficiaries (Figure 16). Medicaid MCOs provide comprehensive acute care (i.e., most physician and hospital services) and, in some cases, LTC to Medicaid beneficiaries and are paid a set per member per month payment for these services. Medicaid MCOs represent a mix of private for-profit, private non-profit, and government plans. States have increased their reliance on MCOs with the aim of improving access to certain services, enhancing care coordination and management, and making future costs more predictable. While the shift to MCOs has increased budget predictability for states, the evidence about the impact of managed care on access to care, costs, and outcomes is both limited and mixed. Children and adults are more likely to be enrolled in MCOs than adults aged 65 and older and people eligible because of a disability; however, states are increasingly including beneficiaries with complex needs in MCOs. States are also increasingly leveraging Medicaid MCOs to help identify and address social determinants of health and to reduce health disparities.

A large body of research shows that Medicaid enrollees have substantially better access to care than people who are uninsured (who are also primarily low-income) and are less likely to postpone or go without needed care due to cost. Key measures of access to care and satisfaction with care among Medicaid enrollees are generally comparable to rates for people with private insurance (Figure 17). Given Medicaid enrollees have low incomes, federal rules include protections to limit out-of-pocket costs that can help improve access.  A 2023 KFF Survey of Consumer Experiences with Health Insurance found Medicaid enrollees report fewer cost-related problems compared to those with Marketplace or employer coverage. While most Medicaid enrollees will continue to be protected against large out-of-pocket costs, the tax and spending law newly requires states to impose cost sharing of up to $35 on certain services on Medicaid expansion adults who have incomes 100% – 138% FPL.

Longstanding research shows that Medicaid eligibility during childhood is associated with positive effects on health (including reduced avoidable hospitalizations and mortality) and impacts beyond health, such as improved long-run educational attainment. Early and updated research findings show that state Medicaid expansions to low-income adults are associated with increased access to care, increased economic security, improved self-reported health status, and other outcomes including increased early-stage cancer diagnosis rates, lower mortality rates for certain conditions (e.g., cancer, cardiovascular disease, liver disease), decreased maternal mortality, improved treatment management for conditions (e.g., diabetes, HIV), and improved outcomes related to substance use disorders. Gaps in access to certain providers (e.g., psychiatrists and dentists) are an ongoing challenge in Medicaid that may reflect system-wide problems, but may be exacerbated by provider shortages in low-income communities, Medicaid’s lower physician payment rates, and lower Medicaid physician participation compared with private insurance. In 2021, MACPAC found physicians were less likely to accept new Medicaid patients (74%) than those with Medicare (88%) or private insurance (96%), but these rates may vary by state, provider type, and setting. Medicaid acceptance was much higher where physicians practiced in community health centers, mental health centers, non-federal government clinics, and family clinics compared to the average for all settings. Provider participation rates may contribute to findings that Medicaid enrollees may experience more difficulty obtaining health care than those with private insurance.  A 2023 KFF Survey of Consumers found Medicaid enrollees report more problems with prior authorization and provider availability compared to people with other insurance types.

Section 1115 demonstration waivers offer states the ability to test new approaches in Medicaid that differ from what is required by federal statute, if CMS determines that such proposals are “likely to assist in promoting the objectives of the Medicaid program.” Nearly all states have at least one active Section 1115 waiver and some states have multiple 1115 waivers. Section 1115 waivers have been used over time and generally reflect priorities identified by the states as well as changing priorities from one presidential administration to another (Figure 18). Waivers have been used to expand coverage or benefits, change policies for existing Medicaid populations (e.g., testing premiums or other eligibility requirements), modify delivery systems, restructure financing or authorize new payments (e.g., supplemental payments or incentive-based payments), as well as make other program changes. 

Activity from the first Trump administration and the Biden administration tested how 1115 waivers can be used to advance administrative priorities and also tested the balance between states’ flexibility and discretion by the federal government. The first Trump administration’s Section 1115 waiver policy emphasized work requirements and other eligibility restrictions, payment for institutional behavioral health services, and capped financing. The Biden administration withdrew waiver approvals with work requirements, phased out approval of premium requirements, and instead encouraged states to propose waivers that expand coverage, reduce health disparities, advance “whole-person care,” and improve access to behavioral health care. Areas of focus during the Biden administration included leveraging Medicaid to address health-related social needs (including housing instability, homelessness, nutrition insecurity) and to provide health care to individuals transitioning from incarceration back into the community. Several states also received approval to provide multi-year continuous Medicaid coverage for children. Recent actions from the new Trump administration could signal efforts to curtail waivers related to social determinants of health, continuous eligibility and to limit 1115 waiver financing tools and flexibility. In addition, several states are seeking approval for work requirements waivers. Although the tax and spending reconciliation law now includes a national work requirement, some states may continue to pursue waivers to implement work requirements prior to January 1, 2027 when the national requirement goes into effect.

Various types of waivers and other emergency authorities can also be used to respond to emergencies. These authorities can help expand Medicaid capacity and focus on specific services, providers, or groups of enrollees that may be particularly impacted. During the COVID-19 pandemic, all 50 states and Washington, D.C. received approval to make changes using emergency authorities to facilitate access to care by expanding telehealth, eligibility, benefits and help address workforce issues for home- and community-based services.

Looking to the future, Medicaid faces a number of challenges, including: 

• How will the new work requirements, eligibility and cost sharing changes affect Medicaid enrollment and access to care, particularly for adults covered through the Medicaid expansion?
• What impact will the Medicaid changes have on the number of people without health insurance?
• How will states respond to federal Medicaid spending cuts and limits on their ability to use provider taxes to help finance the non-federal share of Medicaid spending?
• How will the cuts in Medicaid spending and enrollment affect health care providers (including rural providers) and the broader health care system? To what extent will a new temporary rural health fund totaling $50 billion blunt some of the effects of the cuts?
• Will administrative actions and federal funding cuts for Medicaid as well as broader federal changes in immigration policy affect Medicaid payment rates for long-term care and the long-term care workforce?
• Will Congress move to reverse some of the Medicaid cuts before they go into effect?

Policy changes to Medicaid have implications for the roughly 80 million people who rely on the program for health coverage, state and federal budgets and spending, and health care providers, including nursing facilities and home care providers. As the source of nearly one fifth of total health care spending, these changes will also have implications for the broader health care system. Changes in Medicaid enrollment will also affect overall coverage trends. Declines in Medicaid enrollment can be expected to increase the number of people who are uninsured, jeopardizing improvements in the affordability of and access to care for potentially millions of people.  

• 10 Things to Know About Medicaid
• Medicaid: What to Watch in 2025 | KFF
• Medicaid Financing: The Basics
• 10 Things to Know About Medicaid Managed Care
• 10 Things About Long-Term Services and Supports (LTSS)
• 50-State Medicaid Budget Survey Archives
• 50-State Medicaid Eligibility Survey Archives
• 50-State Survey Archives: Medicaid HCBS and Eligibility Based on Disability or Age 65+
• Status of State Medicaid Expansion Decisions: Interactive Map
• Medicaid Waiver Tracker: Approved and Pending Section 1115 Waivers by State
• Allocating CBO’s Estimates of Federal Medicaid Spending Reductions Across the States: Enacted Reconciliation Package | KFF
• Health Provisions in the 2025 Federal Budget Reconciliation Law
• Implementation Dates for 2025 Budget Reconciliation Law

Rudowitz, R., Tolbert, J., Burns, A., Hinton, E., Chidambaram, P., & Mudumala, A., Medicaid 101. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-medicaid/ (date accessed)

Health and health care disparities refer to preventable differences in health and health care among groups that stem from broader social and economic factors. Despite the recognition of disparities for decades and overall improvements in population health over time, many disparities persist, and in some cases, have widened over time. Disparities limit the overall health of the nation and result in unnecessary costs. This chapter provides an overview of what health and health care disparities are, the factors that drive them, the status of racial and ethnic health and health care disparities today, how recent federal actions may impact disparities, and future considerations. The information and data included in this chapter are current as of July 2025.

In the wake of the COVID-19 pandemic and racial reckoning following the murders of George Floyd and others, the federal government as well as many states and private entities increased efforts focused on addressing health disparities. Since taking office, the Trump administration has taken a range of actions to eliminate federal diversity and disparities-related initiatives, restructured and eliminated federal staff and offices that played key roles in identifying and addressing disparities, and implemented policies focused on restricting immigration and increasing interior enforcement to support mass deportation of immigrants. Moreover, the 2025 federal budget reconciliation law makes large cutbacks to federal spending for Medicaid and the Affordable Care Act’s (ACA’s) provisions. These actions will likely lead to widening disparities in health and health care going forward.

Health and health care disparities refer to preventable differences in health and health care among groups that stem from broader social and economic factors. There are multiple definitions of health disparities. The Centers for Disease Control and Prevention (CDC) defines health disparities as “preventable differences that populations experience in the burden of disease, injury, violence, or opportunities.” A health care disparity typically refers to differences between groups in health insurance coverage, affordability, access to and use of care, and quality of care. The terms “health inequality” and “inequity” also are used to describe differences that stem from systemic and unjust or inequitable social and economic policies. Racism, which the CDC previously defined as a system that includes structural, institutional, interpersonal, and internalized racism that assigns value and determine opportunities based on the way people look or the color of their skin, results in conditions that unfairly advantage some and disadvantage others. Racism and discrimination at all levels, intentional or not, contribute to differences in experiences across many aspects of everyday life as well as in health care settings, which can negatively impact people’s health and well-being.

Reflecting the intersectional nature of people’s identities, some individuals experience disparities across multiple dimensions beyond race and ethnicity such as citizenship, sexual orientation and gender identity, and disability status.  Disparities also occur within subgroups of broader racial and ethnic groups, such as gender, ethnic identity, immigration status, and English proficiency. For example, a KFF survey shows that Black women report more pervasive negative experiences in health care settings compared to other groups. These groups are not mutually exclusive and often intersect in meaningful ways.  The Healthcare Research and Quality Act of 1999, which established an Office of Priority Populations within the Agency for Healthcare Research and Quality (AHRQ) identifies designated priority populations, including “low-income populations, racial/ethnic minorities, maternal health, women, children/adolescents, elderly, and individuals with special health care needs.” The National Institute on Minority Health and Health Disparities, established under the Minority Health and Health Disparities Research and Education Act also has designated populations with health disparities, including “racial and/or ethnic minority populations, low socioeconomic status, underserved rural populations, people with disabilities, and sexual minority groups.”

Health equity generally refers to individuals achieving their highest level of health through the elimination of disparities in health and health care. The CDC describes health equity as when everyone has a fair and just opportunity to be as healthy as possible. The World Health Organization (WHO) states that “health equity is achieved when everyone can attain their full potential for health and well-being.” The WHO defines equity as the absence of unfair and avoidable differences among groups, regardless of their identity, where they live, and other social and economic factors. The terms health equity and equality both refer to efforts to achieve better health outcomes and access to health care services for all groups. While health equality refers to providing all people with the same resources and opportunities, it does not account for people’s different underlying needs or circumstances that may affect their ability to achieve optimal health outcomes and health care access.

The U.S. has a long history of policies and events that have resulted in stark differences in access to resources, opportunities, and power that contribute to racial and ethnic disparities in health today. Dating back to slavery and colonization of the Americas, people of color have been subject to abuse and mistreatment, including medical exploitation and experimentation, family separation, and efforts to eliminate cultural practices and languages. Historical discriminatory policies, such as redlining, have lasting effects today, leading to residential segregation of Black and Hispanic people into urban neighborhoods with more limited resources and increased health risks, including climate-related risks. Within medicine, disproven beliefs about biological differences by race persist today and have led to race permeating clinical decision making and treatment in multiple ways, including through providers’ attitudes and implicit biases, disease stereotyping and clinical nomenclature, and its use in clinical algorithms, tools, and treatment guidelines. Similarly, historical anti-immigrant policies have excluded and discriminated against certain groups, contributing to “othering” and “perpetual foreigner” stereotypes, particularly among Asian immigrants, with a resurgence in anti-Asian rhetoric amid the COVID-19 pandemic. Policies, such as the 1996 Welfare Reform Law, have restricted access to public assistance programs, including health coverage, contributing to persistent disparities in health coverage and care for immigrants today, who are disproportionately Hispanic or Asian.

Underlying inequities in social and economic factors that reflect historical and contemporary policies drive racial and ethnic disparities in health (Figure 1). Though health care is essential to health, studies suggest that social and economic factors, often referred to as  social determinants of health, are the primary drivers of health outcomes. These include factors such as access to housing, food, and economic and educational opportunities. Hispanic, Black, AIAN, and NHPI people fare worse compared to White people across many social and economic factors. Experiences for Asian people are mixed, although some subgroups of Asian people fare worse compared to White people. Asian immigrants face certain additional challenges.

Experiences with unfair treatment and discrimination negatively impact health and well-being. Despite growing calls to address racism in the wake of the COVID-19 pandemic and the accompanying racial reckoning, many adults continue to experience unfair treatment and discrimination in their daily lives and in health care settings. A 2023 KFF survey finds that at least half of AIAN (58%), Black (54%), Hispanic adults (50%), and about 4 in 10 Asian adults (42%) say they experienced at least one type of discrimination in daily life in the past year. These experiences include receiving poorer service than others at restaurants or stores; people acting as if they are afraid of them or as if they aren’t smart; being threatened or harassed; or being criticized for speaking a language other than English. Consistent with other research, which shows that racism has negative effects on mental health and results in certain negative physical health outcomes, among those with discrimination experiences, 4 in 10 (40%) say they “always” or “often” felt anxious in the past year, compared to 14% of adults who rarely or never experience such discrimination (Figure 2). Similarly, those with experiences of discrimination in their daily life are more than three times as likely as others to say they always or often felt lonely (26% vs. 7%) or depressed (25% vs. 7%) in the past year.

Racism and discrimination also negatively affect people’s health care experiences. KFF survey data also show that Black, Hispanic, AIAN, and Asian adults report higher levels of unfair treatment when seeking health care than their White counterparts and are more likely to report having certain negative experiences with a health care provider because of their race and ethnicity (Figure 3). About a quarter of adults who experienced unfair treatment, a negative experience with a provider, or a language access challenge say it led to worse health, being less likely to seek care, and/or switching providers. Similarly, as of 2023, one in four (25%) immigrant adults said that they were treated unfairly by a health care provider in the U.S., including nearly four in ten (38%) Black immigrant adults.

Addressing disparities in health and health care is important not only from an equity standpoint but also for improving the nation’s overall health and economic prosperity. Racial and ethnic health and health care disparities result in higher rates of illness and death across a wide range of health conditions, limiting the overall health of the nation. Research further finds that health disparities are costly, resulting in excess medical care costs and lost productivity, as well as additional economic losses due to premature deaths each year.

It is increasingly important to address health disparities as the population becomes more diverse and stark income inequalities persist (Figure 4). The population has become increasingly racially diverse, reflecting shifting immigration patterns, a growing multiracial population, as well as adjustments to how the U.S. Census Bureau measures race and ethnicity. The U.S. Census Bureau projects that people of color will account for over half (52%) of the population in 2050, with the largest growth occurring among people who identify as Asian or Hispanic. Income inequality within the U.S. has also widened over time. As of 2023, the top 10% of households in the U.S. had incomes above $216,000 compared with incomes at or below $17,100 among the lowest 10% of households.

Major recognition of health disparities began nearly four decades ago. In 1985, the Report of the Secretary’s Task Force on Black and Minority Health (commonly known as the Heckler Report) documented persistent health disparities that accounted for 60,000 excess deaths each year and synthesized ways to advance health equity. The Heckler Report led to the creation of the Office of Minority Health within the Department of Health and Human Services (HHS) (which was reportedly shut down by the Trump administration as part of the HHS staff restructuring and reductions) and influenced federal recognition of and investment in many aspects of health equity. In 2003, the Institute of Medicine’s Unequal Treatment: Confronting Racial and Ethnic Disparities in Health Care report was issued, which identified systemic racism as a major cause of health disparities in the United States.

Despite the recognition and documentation of disparities for decades and overall improvements in population health over time, many disparities persist, and in some cases, have widened over time .Analysis across a broad range of health measures finds that Black and AIAN people fare worse than their White counterparts across half or more of these measures. Data for Hispanic people are more mixed relative to White people, with them faring better on some measures but worse on others. In the aggregate, Asian people fare the same or better than White people on many measures of health, although this finding masks disparities among subgroups of the population. Data gaps limit the ability to examine disparities among NHPI people; where data are available, they point to disparities, particularly for certain subgroups of this population. Overall, Black, Hispanic, and AIAN people fare worse compared to White people across many measures of health outcomes including:

• AIAN and Black people had a shorter life expectancy at birth compared to White people based on provisional data from 2022. Life expectancy for Black people was about five years shorter than White people (72.8 vs. 77.5), and nearly ten years shorter for AIAN people (67.9).
• AIAN, Hispanic, and Black people experienced larger declines in life expectancy than White people between 2019 and 2021, largely reflecting an increase in excess deaths due to COVID-19.
• NHPI people had the highest age adjusted mortality rates for diabetes among all racial and ethnic groups at 49.6 per 100,000 deaths. The age-adjusted mortality rates for diabetes for AIAN (41.5 per 100,000) and Black people (39.1 per 100,000) were about twice as high as the rate for White people (19.8 per 100,000); Hispanic people (26.5 per 100,000) also had a higher diabetes death rate compared to White people in 2023. Although Black people did not have higher cancer incidence rates than White people overall and across most types of cancer, they had the highest overall cancer-related mortality rate as of 2022. Black people (165 per 100,000 deaths) were more likely to die from cancer than White people (148.4 per 100,000), and NHPI people had a slightly lower overall cancer-related mortality rate (141.4) to White people in 2022.
• Black infants were more than two times as likely to die as White infants (10.9 vs. 4.5 per 1,000 live births) as of 2023. AIAN infants (9.1 per 1,000) were roughly twice as likely to die as White infants (Figure 5). Hispanic infants (4.9 per 1,000) also had a slightly higher mortality rate than White infants in 2023.
• AIAN (118.7 per 100,000), NHPI (111.7 per 100,000), and Black (69.3 per 100,000) women also had the highest rates of pregnancy-related mortality in 2021

There are also ongoing racial and ethnic disparities in health coverage and access to care.  Despite large gains in coverage across groups since the ACA coverage expansions were implemented in 2014, as of 2022, nonelderly AIAN, Hispanic, Black, and NHPI people were more likely to be uninsured compared to their White counterparts (Figure 6). There are also large coverage disparities by immigration status, with a 2023 KFF/LA Times Survey of Immigrants showing that about one in five (18%) lawfully present immigrant adults and half (50%) of likely undocumented immigrant adults reported being uninsured as compared to less than one in ten citizens. In addition, Hispanic, Black, Asian, AIAN, and NHPI adults are more likely than White adults to report not having a personal health care provider, and Hispanic, Black, AIAN, and NHPI adults are more likely than White adults to report not seeing a doctor in the past 12 months because of cost.

In the wake of the COVID-19 pandemic and racial reckoning following the murders of George Floyd and others, the federal government as well as many states and private entities increased efforts focused on addressing health disparities. This increased focus led to the development of programs and initiatives focused on mitigating disparities, including efforts to address disparities in maternal and infant health, cancer, and chronic disease, as well as other efforts, such as increasing diversity in clinical trials for development of new drugs and devices. Research efforts also increased to understand disparities, the factors driving them, and effective interventions to mitigate them.

The Biden administration issued a series of executive orders and other efforts to advance health equity.  These included orders that outlined equity as a priority for the federal government, equity as a central part of the pandemic response and recovery efforts, and also directed federal agencies to develop Equity Action Plans. HHS’ equity action plan outlined a series of strategies that included efforts to improve access and address barriers to quality and affordable health care; prioritize behavioral health for underserved populations; and improve maternal health outcomes for rural, Tribal, and underserved racial and ethnic groups. HHS also enacted its climate action plan, including establishing the Office of Climate Change and Health Equity to address the impacts of climate change on health outcomes and health equity.  The administration released a Blueprint for Addressing the Maternal Health Crisis, a whole government approach to combatting maternal mortality and morbidity with a focus on reducing disparities in maternal health outcomes and improving overall pregnancy, birth, and postpartum outcomes. Federal efforts were also made to increase the availability of disaggregated data for smaller population groups, including AIAN and NHPI people, to understand and address the health and heath care disparities they face. During his term, President Biden reversed public charge regulations from the Trump administration’s first term to reduce fears about participating in programs, including Medicaid and the Children’s Health Insurance Program.

As one of his first actions in office, President Trump signed executive orders revoking federal diversity, equity, inclusion, and accessibility (DEIA) related programs and actions in the federal government and among federal contractors and grantees.  In implementing President Trump’s executive orders, the administration has taken significantly broader actions beyond eliminating DEI programs to eliminate priorities, actions, information, data, and funding related to concepts of diversity or disparities among federal agencies as well as federal contractors and grantees.The Office of Personnel Management directed agencies and departments to take down all outward facing media that “inculcate or promote” “gender ideology,” as well as to remove all public facing DEI related websites and content. This resulted in the temporary shutdown of websites and removal of key health datasets. While some web pages and datasets began returning in several days, they included a warning message that they were being modified to comply with President Trump’s executive orders and some materials, such as codebooks and questionnaires, did not immediately return. The administration also directed departments and agencies to pause grants provided to federal contractors to identify and review programs and activities for consistency with the President’s policies. Reports indicate that the administration flagged over 100 words that federal agencies should limit or avoid to comply with the President’s policies, including disparities, diversity, equity, and race; that the CDC ordered the withdrawal of papers pending publication to ensure language compliance; and that research grants were terminated to comply with new restrictions. As part of efforts to eliminate diversity and disparities related initiatives the administration also eliminated environmental justice actions and programs

The administration also eliminated about 10,000 employees from HHS, including many of those focused on addressing disparities as part of a restructuring effort. The HHS Office of Minority Health, CDC’s Office of Health Equity, the Office of Women’s Health, and the Office for Civil Rights are among the offices facing partial or complete cuts. The impact of these cuts is compounded by the loss of population-specific initiatives and offices. The administration’s proposed budget cuts to the Indian Health Services (IHS) and HHS include $900 million in cuts to the IHS budget and eliminating advanced appropriations.  In addition to eliminating staff directly working on disparities, other cuts were made that will have important implications for disparities. The restructuring cut jobs from the CDC’s National Center for Chronic Disease Prevention and Health Promotion, which has resulted in the termination of programs focused on diabetes, obesity, dementia, and kidney disease, which disproportionately affect people of color. The HHS restructuring has also impacted federal maternal and infant health programs, including layoffs of most staff at the CDC’s Division of Reproductive Health, which serves to provide data, research, and assistance to states “on issues related to reproductive health, maternal health, and infant health.” These staff cuts are accompanied by the suspension of the Pregnancy Risk Assessment Monitoring System, which has documented disparities in maternal mortality and morbidity for 38 years.

The actions to eliminate diversity and disparities related initiatives will likely lead to widening disparities, reversing recent efforts to advance health equity. Elimination of focused efforts to address health disparities will potentially further exacerbate disparities, contributing to worsening overall health and unnecessary health care costs. Focused plans and initiatives to mitigate health disparities seek to address the underlying inequities that drive disparities and meet the needs and preferences of diverse populations. In the absence of focused efforts, disparities will likely widen because the underlying inequities that contribute to them persist. Additionally, the elimination of information, data, and research will inhibit the ability to identify disparities and understand the factors driving them. Data are essential for identifying where disparities exist, directing efforts and resources to address disparities as they are identified, measuring progress toward achieving greater equity, and establishing accountability for achieving progress. Without adequate data and research, disparities may remain unseen and unaddressed.

The Trump administration has also made immigration policy changes focused on restricting entry at the border and increasing interior enforcement efforts to support mass deportation, which may contribute to widening disparities among immigrant families. Research suggests that these policies negatively affect the health and well-being of immigrant families, including citizen children living in these families. KFF survey data from 2025 show that immigrants’ worries about detention or deportation have risen sharply since 2023, even among lawfully present immigrants and naturalized citizens, and many say these worries are affecting their health. Moreover, accompanying KFF focus groups  found that immigration policies and actions undertaken by the Trump administration have led to increased fears, uncertainty, and financial hardships among immigrant families across immigration statuses that have had negative effects on their daily lives, health, and well-being, including negative mental health impacts on them and their children. Efforts to restrict immigration not only impact the health and well-being of immigrant families, but can also negatively impact the U.S. economy and workforce, given the role immigrants play, particularly in certain industries such as health care, construction, and agriculture.

Under the recently passed budget reconciliation law there are large cuts to federal spending for Medicaid and the ACA, which will likely lead to widening racial and ethnic disparities in health coverage and, in turn, exacerbate disparities in access to care. Medicaid is a major source of coverage for people of color, helping to fill gaps in employer sponsored coverage, particularly for children (Figure 7). The ACA’s coverage expansions through Medicaid and the Marketplaces contributed to large gains in health coverage across racial and ethnic groups and reduced racial disparities in coverage. The law includes substantial cuts to federal Medicaid spending and changes to the ACA, which the Congressional Budget Office projects will increase the number of uninsured by about 10 million by 2034. The law includes provisions that eliminate eligibility for Medicaid, subsidized ACA Marketplace, and Medicare coverage for many lawfully present immigrants. In addition to reductions in the legislation, the scheduled expiration of tax credits for Marketplace coverage in 2025 and recent Trump administration regulatory changes that make it harder to sign up for ACA coverage are expected to further increase the growth in the uninsured by millions.  Coverage losses, particularly in Medicaid, would widen racial and ethnic disparities in coverage given that larger shares of people of color are covered by the program. In turn, widening disparities in coverage would likely contribute to gaps in access to care and ultimately health outcomes.

Looking to the future, racial and ethnic disparities in health and health care remain a persistent problem, particularly as longstanding efforts to recognize and address them are being dismantled. These disparities are rooted in the ongoing impacts of racism and discrimination, which contribute to structural inequities in access to resources, opportunities, and health care as well as bias within health systems and daily life. As efforts to advance health equity face increasing challenges some key issues include:

How to mitigate bias and disparate treatment in the medical system, amid the growing use of AI and data-driven tools in health care and perpetuation of disproven beliefs about biologic differences by race.

How rollbacks to federal disparities initiatives and DEI programs will impact long term efforts to address disparities in health.

How to close racial and ethnic gaps and prevent further widening of disparities in health coverage and access to care amid efforts to cut Medicaid and other public programs.

What data and research will remain available to identify and understand disparities and develop interventions to address them.

How uneven impacts of climate change and climate-related health risks may impact disparities amid the rollbacks of federal environmental justice efforts.

• Survey on Racism, Discrimination and Health: Experiences and Impacts Across Racial and Ethnic Groups
• Health and Health Care Experiences of Immigrants: The 2023 KFF/LA Times Survey of Immigrants
• Disparities in Health and Health Care: 5 Key Questions and Answers
• Key Data on Health and Health Care by Race and Ethnicity
• Health Coverage by Race and Ethnicity, 2010-2022
• What is Driving Widening Racial Disparities in Life Expectancy?
• Racial Disparities in Maternal and Infant Health: Current Status and Efforts to Address Them
• Key Facts on Health Coverage of Immigrants
• Climate Change and Health Equity: Key Questions and Answers
• Medicaid and Racial Health Equity
• How History Has Shaped Racial and Ethnic Health Disparities: A Timeline of Policies and Events

Ndugga, N., Pillai, D., Hill, L., & Artiga, S., Race, Inequality, and Health. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-race-inequality-and-health/ (date accessed).

Health care costs in the United States generally grow faster than inflation. The U.S. far exceeds other large and wealthy nations in per capita health spending, and health care represents a much larger share of the economy in the U.S. than in peer nations. Despite substantial spending, the U.S. health system grapples with disparities and gaps in coverage. Elevated health care expenditure in the U.S. does not consistently translate into superior health outcomes. Rising health care costs instead contribute to Americans facing difficulties affording medical care and drugs, even among those with insurance.

Many people are familiar with the high and rising cost of health care in the United States from seeing how much they spend on their own health insurance premiums and out-of-pocket costs. In addition to these very visible health costs, there are also tax dollars that go to fund public programs and the amounts employers spend toward their employees’ health insurance premiums. Total national health expenditures include spending by both public programs and private health plans, as well as out-of-pocket health spending. Total health expenditures represent the amount spent on health care (such as doctor visits, hospital stays, and prescription drugs) and related activities (such as insurer overhead and profits, health research and infrastructure, and public health).

Total Health Spending Reached $4.9 Trillion in 2022

Health spending in the U.S. has risen sharply over the last several decades. The official data on national health expenditures from the Centers for Medicare and Medicaid Services (CMS) show health spending totaled $74.1 billion in 1970. By 2000, health expenditures had reached about $1.4 trillion, and in 2023 the amount spent on health had more than tripled to $4.9 trillion. In the first year of the COVID-19 pandemic, health spending accelerated by 10.4% from 2019 to 2020, even as the use of health care dropped, driven largely by public health spending and financial relief provided to health care providers. Most recently, health spending grew 7.5% from 2022 to 2023, faster than the previous year’s 4.6% increase from 2021 to 2022. Health spending is expected to continue to grow at a similar pace for the foreseeable future.

In the chart above, spending is shown in terms of both nominal dollar values (not inflation-adjusted) and constant 2023 dollars (inflation-adjusted based on the personal consumption expenditures, or PCE, index). Inflation in the health sector increased slightly faster than across the general economy in 2023.

Currently, health care represents about 18% of the U.S. economy (measured as a share of gross domestic product, or GDP). In other words, almost 1 out of every 5 dollars spent in the U.S. goes toward health care. Back in 1960, health spending represented just 5% of GDP, meaning 1 in every 20 dollars in the U.S. economy was spent on health care. 

Out-of-pocket costs have also risen over time. Out-of-pocket costs represent the amount of money spent by individuals on health care that is not paid for by a health insurance plan or public program like Medicare or Medicaid. This includes cost-sharing, the most common forms of which are deductibles (an amount that must be paid before most services are covered by the plan), copayments (fixed dollar amounts), and coinsurance (a percentage of the charge for services). (i.e., copays, deductibles, coinsurance), as well as health spending by uninsured people or spending by insured people for care that is not covered at all by health insurance. Out-of-pocket spending does not include the amount spent on a person’s monthly health insurance premium.

Out-of-pocket spending per person was $115 in 1970 (or, adjusted for inflation, $703). By 2023, out-of-pocket spending had reached $1,514 per person. Despite this rise in out-of-pocket spending, health insurance now covers a larger share of total health spending (73%) than it did in 1970 (27%), in part because more people have gained coverage, especially public coverage, but also because health insurance spending per enrollee has grown.

Over the last several decades, health spending has been driven higher by a number of factors, including but not limited to an aging population, rising rates of chronic conditions, advancements in medicine and new technologies, higher prices, and expansions of health insurance coverage. While there are always differences across countries, many of these factors driving health costs upward in the U.S. are also driving health costs growth in peer nations. For example, while the U.S. population is indeed aging and that is driving health costs up, many large and wealthy nations have even more rapidly aging populations.

Other factors may explain the United States’ relatively high health spending compared to its peers. The U.S. health system is fragmented, with many private and public payers, and with regulation of these payers split between states and the federal government. However, these features are not entirely unique to the U.S., either. Indeed, some other countries with much lower health spending have multiple private payers or differences in public programs across states or provinces.  The U.S. is also not alone in having a mainly fee-for-service payment system.

The U.S. health insurance system is largely voluntary, whereas peer countries’ health systems are almost entirely compulsory. Additionally, the U.S. federal and state governments have generally done less to directly regulate or negotiate prices paid for medical services or prescription drugs than have governments of similarly large and wealthy nations. The U.S. often pays higher prices for the same brand-name prescription drugs, hospital procedures, and physician care than similarly large and wealthy countries do.

There are other factors, largely outside the control of the health system that are also likely at play, such as socioeconomic conditions (like income inequality and other social determinants of health), and differences in so-called lifestyle factors (like diet, drug use, or physical activity) that could contribute both to higher spending and worse outcomes.

Breaking total national health spending into its components can reveal the major drivers of health costs and where cost containment efforts could be most effective. The charts below show various ways of examining the key contributors to health spending. For example, the National Health Expenditure Accounts show trends in how health spending varies by type of service (e.g., hospital care vs. retail prescription drugs) or by source of funds (e.g., private health plans vs. public programs). An alternative and relatively new approach to understanding health spending is to break out total health spending into the share that goes to treat certain diseases (e.g., heart disease, cancer). Finally, health spending can also be better understood by looking at trends in prices (e.g., the dollar amount for a hospital stay) and utilization (e.g., the number of hospital stays). 

Hospital and Physician Services Represent Half of Total Health Spending

Most health spending in the U.S. and in peer countries is on hospital and physician care, followed by prescription drugs. In the U.S., hospital spending represented close to a third (31.2%) of overall health spending in 2023, and physicians/clinics represented 20.1% of total spending. In comparison to other large and wealthy countries, the U.S.’s higher spending on inpatient and outpatient care explains the vast majority of higher spending on health care overall.

Spending Has Grown for Hospitals, Physicians, and Drugs

During the 1970s, growth in hospital expenditures outpaced other services, while prescriptions and physician and clinic services saw faster spending growth during the 1980s and 1990s. From 2020 to 2023, retail prescription drugs experienced the fastest growth in spending at 8.6%, following 3.3% average annual growth from 2010 to 2020. Average spending growth for hospitals and physicians/clinics between 2020 and 2022 was 6.2% and 6.3%, respectively.

On a Per-Enrollee Basis, Private Insurance Spending Has Typically Grown Much Faster Than Medicare and Medicaid Spending

Per enrollee spending by private insurance grew by 80.4% from 2008 to 2023 – much faster than both Medicare and Medicaid spending growth per enrollee (50.3% and 30.3%, respectively). Private insurance often pays higher prices for health care compared to prices paid by Medicare and Medicaid.

Per enrollee spending by Medicaid rose by 7.9% in 2023 from the previous year, and also continued to increase in private insurance and Medicare (5.9% and 7.1% respectively). Medicare and private insurance per-enrollee spending continued to grow faster between 2021 and 2023 after slower growth in 2020. Medicaid per-enrollee spending had previously declined in 2021 as total enrollment grew, particularly among children and non-elderly adults, who generally have lower per-enrollee spending.

A Substantial Share of Health Spending Goes Toward the Treatment of Circulatory and Musculoskeletal Conditions

An alternative way of examining the components of health spending is to use the Bureau of Economic Analysis (BEA)’s Health Care Satellite Account, which estimates spending and price growth by disease category (e.g., cancer, infectious disease). This approach differs from the official categorization of health spending by service type (e.g., provider services). Essentially, the new satellite account redefines the “commodity” in healthcare as the treatment for specific diseases, rather than a hospital stay or a physician visit. BEA researchers found that the largest categories of medical services spending include the treatment of circulatory diseases (10.4% of health spending in 2021), musculoskeletal conditions (9.4%) and infectious diseases (9%). Another large share of health spending (15.1%) is for “ill-defined conditions,” which can include routine check-ups and follow-up care that is not easily designated for a particular illness.

Health Spending is a Function of Prices and Use

Health services spending is generally a function of prices (e.g., the dollar amount charged for a hospital stay) and utilization (e.g., the number of hospital stays).

People and health plans in the U.S. often pay higher prices for the same prescription drugs or hospital procedures than people in other large and wealthy nations do. In terms of utilization, there is not much evidence that people in the U.S. use more health care. In fact, Americans generally have shorter average hospital stays and fewer physician visits per capita. Therefore, a large part of the difference in health spending between the U.S. and its peers can be explained by higher prices, more so than higher utilization.

Over time, within the U.S., prices and utilization have driven health cost growth to varying degrees. In the 1980s and early 1990s, growth in health care prices far exceeded growth in use. Faster growth in health prices in the U.S. during this time drove the divergence in per capita health spending between the U.S. and other large, wealthy OECD countries. While health care prices have grown more moderately in recent decades, prices in the U.S. for health services continue to exceed what other countries pay.

More recently, the COVID-19 pandemic led to fluctuations in health care use. Early in the pandemic, many health services, such as elective surgeries, were postponed or cancelled and many elected to not get care to avoid infections at health care sites. In 2021, health services use increased by 9% from the previous year, but subsequent years showed slightly lower growth rates (2024 health services use increased 5.6% from 2023). This increase in health care use in 2021 followed a sharp decrease in health utilization in 2020. Health care prices increased moderately – between 2 and 3% – between 2020 and 2024, but changing market conditions since the pandemic and policies enacted in 2025 are likely to increase health costs at an increasing rate.

A small portion of the population accounts for a large share of health spending in a given year. Although we tend to focus on averages, a small number of people spend around the average since individual health needs vary over the life course. Some portions of the population (older adults and those with serious or chronic illnesses) require more and higher-cost health services than those who are younger, healthier, or otherwise in need of fewer or less costly services.

Older People and People with Significant Health Needs Account for Most Health Expenditures

While there are people with high spending at all ages, overall, people 55 and over accounted for 54% of total health spending in 2022, despite making up only 31% of the population. In contrast, people under age 35 made up 44% of the population but were responsible for only 23% of spending.

People with significant health needs account for a large portion of total health spending. People reporting fair or poor health status account for 11% of the population and 27% of the total health spending.

A Small Share of the Population Incurs Most of Health Spending

In 2022, the top 5% of people with the highest health spending accounted for half of total health spending and had an average of $67,300 in health expenditures annually; people with health spending in the top 1% have average spending of over $147,000 per year. At the other end of the spectrum, the 50% of the population with total health spending below or equal to the 50th percentile accounted for only 3% of all health spending; the average spending for this group was $374.

Out-of-pocket spending on health services is concentrated similarly to overall health spending. In this chart, out-of-pocket spending includes direct payments to providers and cost-sharing, including deductibles, copays, and coinsurance, but does not include monthly premium payments or contributions towards health coverage. Out-of-pocket health spending is similarly concentrated among high-health-need individuals. A small portion of the population accounts for a substantial share of total out-of-pocket health spending in a year.

In 2022, people in the top 1% of out-of-pocket spending paid about $23,700 out-of-pocket for health services on average per year, and people in the top 10% spent an average of $6,126 out-of-pocket per year. People who are in the bottom 50% of out-of-pocket spending spent an average of $24 out of pocket.

In addition to being expensive for the nation as a whole, health care is often also expensive for individuals. High health costs can particularly pose a hardship for people who are in worse health and those with lower incomes. However, challenges affording health care are not limited to certain groups; these challenges are pervasive across the U.S. Even people with private health insurance through their employers are often exposed to high and rising deductibles, and therefore also face affordability challenges. A substantial share of the population does not have enough savings or other liquid assets to afford a high deductible or out-of-pocket maximum common in private health plans.

When health care is unaffordable, it can lead to cost-related access barriers, like forgoing or delaying needed medical care. For those who still receive unaffordable health care, this care can lead to medical debt and other forms of financial instability. Some people experience both types of affordability challenges, missing some needed care while also incurring medical debt for other care.

Half of Adults Say it is Difficult to Afford Health Care Costs

Almost half of U.S. adults say it is difficult to afford health care costs, and one in four say they or a family member in their household had problems paying for health care in the past 12 months. Younger adults, those with lower incomes, adults in fair or poor health, and the uninsured are particularly likely to report problems affording health care in the past year.

Among those under age 65, uninsured adults are more likely to say affording health care costs is difficult (82%) compared to those with health insurance coverage (44%).

Those who are covered by health insurance are not immune to the burden of health care costs. About 4 in 10 insured adults worry about affording their monthly health insurance premium, and 62% worry about affording their deductible before health insurance kicks in. Indeed, large shares of adults with employer-sponsored insurance (ESI) and those with Marketplace coverage rate their insurance as “fair” or “poor” when it comes to their monthly premium and out-of-pocket costs to see a doctor.

1 in 3 Adults Report Putting Off Health Care Because of Cost

Cost-related barriers to accessing health care are more common for some demographic groups than others. For example, people who are Hispanic, lower-income, in worse health, and/or uninsured tend to have higher rates of self-reported cost-related access barriers.

One-quarter of adults say that in the past 12 months they have skipped or postponed getting health care they needed because of the cost, according to KFF polling. Women are more likely than men to say they have skipped or postponed getting health care they needed because of the cost (38% vs. 32%). Adults ages 65 and older, most of whom are eligible for health care coverage through Medicare, are much less likely than younger age groups to say they have not gotten health care they needed because of cost. Three in four uninsured adults (75%) say they have skipped or postponed getting health care they needed due to cost. Insured people are not immune from cost-related barriers to accessing care and more than one in three adults with insurance (37%) report not getting health care they needed due to cost.

Despite the vast majority of the United States population having health insurance, medical debt is not uncommon. Different ways of measuring medical debt result in different estimates of prevalence, but regardless of the method, there is consensus that medical debt is a persistent and pervasive problem in the United States, including for people with insurance.

One way to examine medical debt is through credit reporting, but medical debt is often disguised as other forms of debt when people pay for medical bills on their credit cards or choose to pay off their medical bills while falling behind on other payments.

Another way to measure medical debt is with surveys, which can allow respondents to describe their debt with more detail or nuance. Questions about medical debt and other financial matters can be difficult to compare across surveys. For example, it is not always clear whether respondents are answering about their personal experiences or about their broader family or household. Surveys may also differ in the way they define medical debt or describe what forms of debt to include. 

The KFF Health Care Debt Survey asked respondents to think about money that they currently owe for their own health or dental care or someone else’s, such as a family member or dependent. The KFF Health Care Debt Survey finds that 41% of adults currently have some form of debt caused by their own or a family member’s medical or dental bills.

The  U.S. Survey of Income and Program Participation (SIPP)  asks whether money was owed for a medical bill and not paid in full during the past year for each person in the sample household. SIPP results, therefore, can be looked at on the individual level or for an overall household. This survey shows that about 1 in 12 adults have medical debt they owe for themselves or their family’s medical care in the past year.

Regardless of the survey used to examine medical debt, common themes emerge when looking at differences across demographic groups: adults who are Black, uninsured, lower-income, and in worse health are more likely to have medical debt. People with incomes under $40,000 are significantly more likely than people with higher incomes to go into debt to cover an unexpected medical bill, and people with disabilities are also much more likely to have significant medical debt, which, in addition to the burden of medical costs, could also reflect inadequate supplemental income for people who are unable to work due to disability or illness.

Nationally, Medical Debt Totals at Least $200 Billion

The Consumer Financial Protection Bureau (CFPB) estimates that $88 billion in medical debt is reflected on Americans’ credit reports. However, credit reports may not capture all forms of medical debt. For example, medical debt disguised as credit card debt or money owed to family or friends may not be captured. Surveys may capture medical debt that is not visible on credit reports or is otherwise disguised as another form of debt. The 2023 Survey of Income and Program Participation suggests that total medical debt owed was at least $200 billion at the end of 2023.

Medical Debt is Associated with Financial Vulnerability Across a Range of Indicators

The National Financial Capability Survey (NFCS) is a triennial survey sponsored by the FINRA Foundation that provides information on the financial security, experiences, and vulnerabilities of people and households.

People with medical debt are much more likely to have other forms of financial distress than those without medical debt. Indicators of financial vulnerability — such as spending more money than one’s income, having no “rainy day” fund, or agreeing with the statement “I am just getting by financially” — are more common among adults with medical debt than those without. Additionally, people with medical debt are more likely to overdraw their checking account, have a credit card balance that exposes them to interest payments, take a cash advance on their credit card, or have been contacted by debt collectors. Adults with medical debt are much more likely to use payday loans or other costly loans than those without medical debt.

Each year, actuaries from the Centers for Medicare and Medicaid Services (CMS) project future spending on health. With health care utilization returning to pre-pandemic levels and price inflation in the health sector continuing to outpace general economic inflation, per-person health spending increased 7% in 2023. Annual per capita health spending is projected to grow at an annual rate of 5% per capita on average from 2023 to 2032.

An aging population, labor pressure driving higher prices, and new high-cost prescription drugs coming to market are expected to contribute to a growth in health spending. Health spending was 17.6% of the U.S. economy in 2023 and is expected to reach 19.7% by 2032.

The pandemic has had direct and indirect effects on the health system that can make projections difficult. COVID-19 has led to new costs for vaccination, testing, and treatment and has also caused other shifts in health utilization and spending. Some people avoided medical settings out of concern of contracting COVID and thus missed or delayed routine care or cancer screenings earlier in the pandemic, for example, which could lead to pent-up demand, worsening health conditions, or more complex disease management going forward. Increased use of telemedicine could also shift spending patterns in the future. Further, the recent broad-based inflation trends in the economy and health sector employment trends also add to the uncertainty of these projections.

Federal Government Infusion of Public Health Funding Has Subsided Since Early in the COVID-19 Pandemic

Total national health spending includes spending on direct patient care, as well as spending on public health or prevention. After a sharp increase in federal funding in 2020 driven by the national response to the COVID-19 pandemic, spending on public health has fallen, decreasing by over 58% between 2022 and 2023. Meanwhile, state and local public health spending grew 5%, in line with previous years. Overall public health spending is expected to continue to decline over the next couple of years.

Signed in July 2025, the tax and budget reconciliation law (formerly known as the “One Big Beautiful Bill Act”) includes provisions for addressing federal spending on Medicaid and Affordable Care Act exchanges. The Congressional Budget Office (CBO) expects the law to decrease spending on Medicaid and the Affordable Care Act (ACA) Marketplaces by over $1 trillion and lead to 10 million more uninsured people through 2034.

Additional policy issues that will shape future health spending and affordability include:

• Evolution of State Cost Controls: States implementing measures to control health cost growth, including those potentially supported by the Biden Administration’s new AHEAD model, may prompt further experimentation; however, states can only regulate a subset of private health insurance plans.
• Price Transparency Requirements: Federal price transparency requirements aim to illuminate prices paid to hospitals and providers. There remain challenges with the quality of the data, though CMS continues to request suggestions for improved guidelines. As for a budgetary impact, CBO predicted minimal impact on health sector prices.
• Prescription Drug Pricing: The Trump administration’s 2025 executive order called on pharmaceutical manufacturers to match most-favored-nation prices (MFN, the lowest price offered in other developed nations). The effects of this order on prescription drug prices in the U.S. remain uncertain. Additionally, the Inflation Reduction Act of 2022, targeting Medicare drug spending through government negotiation of drug prices, is expected to reduce Medicare costs, but potential far-reaching effects are still unclear. While CBO expects minimal effects on the availability of new treatments, there is considerable uncertainty surrounding those estimates.
• Expansion of Virtual Care: The COVID-19-induced rise in telehealth, with expanded reimbursement and access, has uncertain impacts on care coordination, quality, health outcomes, and costs.
• Market Dynamics and Anticompetitive Practices: Consolidation among providers, insurers, and drug manufacturers has elevated health care prices, leading to regulatory actions against anticompetitive practices, aiming to protect consumers from rising costs.
• Provider Payment Reforms: Bipartisan efforts in site-neutral payment reform, addressing concerns about higher payments in outpatient settings, have led to Medicare implementing site-neutral payments in some settings and additional legislative proposals. However, challenges in provider charging practices and facility fees persist.
• Value-Based Payment Models: The proliferation of value-based care aims to transfer some of the cost risks from payers to providers, but concerns remain about the effectiveness of these approaches, limited quality improvement, administrative burdens, and reduced physician participation incentives. 
• Changes in Coverage: Despite reduced uninsured rates through continuous Medicaid enrollment and expanded Affordable Care Act Marketplace subsidies during the pandemic, affordability challenges persist among the insured. Renewed disenrollments from Medicaid and the expiration of Marketplace subsidies after 2025 may increase uninsured rates and affordability issues.
• Addressing Medical Debt: Ongoing efforts to address medical debt involve buying medical debt for forgiveness and regulatory actions. However, the root causes of high health costs and underinsurance remain untouched by most efforts to mitigate the negative effects of medical debt.

• National Health Spending Explorer – Peterson-KFF Health System Tracker
• How has U.S. spending on healthcare changed over time? – Peterson-KFF Health System Tracker
• How much is health spending expected to grow? – Peterson-KFF Health System Tracker
• What are the recent and forecasted trends in prescription drug spending? – Peterson-KFF Health System Tracker
• How does medical inflation compare to inflation in the rest of the economy? – Peterson-KFF Health System Tracker
• How many people have enough money to afford private insurance cost sharing? – Peterson-KFF Health System Tracker
• Americans’ Challenges with Health Care Costs | KFF
• How does cost affect access to healthcare? – Peterson-KFF Health System Tracker
• The burden of medical debt in the United States – Peterson-KFF Health System Tracker
• Health Care Debt In The U.S.: The Broad Consequences Of Medical And Dental Bills | KFF

Amin, K., Cox, C., Ortaliza, J. & Wager, E., Health Care Costs and Affordability. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-health-care-costs-and-affordability/ (date accessed).

The federal government is not the only place health policy is made in the U.S., but it is by far the most influential. Of the $4.9 trillion the U.S. spent on health in 2023, the federal government was responsible for roughly a third of all health services. The payment and coverage policies set for the Medicare program, in particular, often serve as a model for the private sector. Many health programs at the state and local levels are also impacted by federal health policy, either through direct spending or rules and requirements. Federal health policy is primarily guided by Congress, but carried out by the executive branch, predominantly by the Department of Health and Human Services. 

No one is “in charge” of the fragmented U.S. health system, but the federal government probably has the most influence, a role that has grown over the last 75 years. Today the federal government pays for care, provides it, regulates it, and sponsors biomedical research and medical training.  

The federal government pays for health coverage for well over 100 million Americans through Medicare, Medicaid, the Children’s Health Insurance Program (CHIP), the Veterans’ Health Administration, the Indian Health Service, and the Affordable Care Act (ACA).  It also pays to help provide insurance coverage for tens of millions who are active-duty and retired military and for civilian federal workers.

Federal taxpayers also underwrite billions of dollars in health research, mainly through the National Institutes of Health (NIH) and the Agency for Healthcare Research and Quality (AHRQ).

Federal public health policy is spearheaded by the Centers for Disease Control and Prevention. Its portfolio includes tracking not just infectious disease outbreaks in the U.S. and worldwide, but also conducting and sponsoring public health research and tracking national health statistics. 

The Health Resources and Services Administration (HRSA) funds critical health programs for underserved Americans (including Community Health Centers) and runs workforce education programs to bring more health services to places without enough health care providers. 

Meanwhile, in addition to overseeing the nation’s largest health programs, the Centers for Medicare and Medicaid Services (CMS) also operates the federal insurance Marketplaces created by the ACA and enforces rules made by the law for private insurance policies. 

While the federal government exercises significant authority over medical care and its practice and distribution, state and local governments still have key roles to play.  

States oversee the licensing of health care professionals, distribution of health care resources, and regulation of health insurance plans that are not underwritten by employers themselves. State and local governments share responsibility for most public health activities and often operate safety-net facilities in areas with shortages of medical resources. 

All three branches of the federal government – Congress, the executive branch, and the judiciary – play important roles in health policy. 

Congress makes laws that create new programs or modify existing ones. It also conducts “oversight” of how the executive branch implements the laws Congress has passed. Congress also sets the budget for “discretionary” and “mandatory” health programs (see below) and provides those dollar amounts. 

The executive branch carries out the laws made by Congress and operates the federal health programs, often filling in details Congress has left out through rules and regulations. Federal workers in the health arena may provide direct patient care, regulate how others provide care, set payment rates and policies, conduct medical or health systems research, regulate products sold by the private sector, and manage the billions of dollars the federal government spends on the health-industrial complex.  

Historically, the judiciary has had the smallest role in health policy, but has played a pivotal role in recent cases. It passes judgment on how or whether certain laws or policies can be carried out and settles disputes between the federal government, individuals, states, and private companies over how health care is regulated and delivered.  Recent significant decisions from the Supreme Court have affected the legality and availability of abortion and other reproductive health services and the constitutionality of major portions of the ACA.

The Executive Branch – The White House

Although most of the executive branch’s health policies are implemented by the Department of Health and Human Services (and to a smaller extent, the Departments of Labor and Justice), over the past several decades the White House itself has taken on a more prominent role in policy formation. The White House Office of Management and Budget not only coordinates the annual funding requests for the entire executive branch, but it also reviews and approves proposed regulations, Congressional testimony, and policy recommendations from the various departments. The White House also has its own policy support agencies – including the National Security Council, the National Economic Council, the Domestic Policy Council, and the Council of Economic Advisors – that augment what the President receives from other portions of the executive branch.

Most federal health policy is made through the Department of Health and Human Services. Exceptions include the Veterans Health Administration, run by the Department of Veterans Affairs; TRICARE, the health insurance program for active-duty military members and dependents, run by the Defense Department; and the Federal Employees Health Benefits Program (FEHB), which provides health insurance for civilian federal workers and families and is run by the independent agency the Office of Personnel Management.  

The health-related agencies within HHS are roughly divided into the resource delivery, research, regulatory, and training agencies that comprise the U.S. Public Health Service and the health insurance programs run by the Centers for Medicare and Medicaid Services (CMS). 

Ten of the 13 operating divisions of HHS are part of the U.S. Public Health Service, which also plays a role in U.S. global health programs. They are: 

• The Administration for Strategic Preparedness and Response (ASPR) 
• The Advanced Research Projects Agency for Health (ARPA-H)
  • The Agency for Healthcare Research and Quality (AHRQ) 
  • The Agency for Toxic Substances and Disease Registry (ATSDR) 
  • The Centers for Disease Control and Prevention (CDC) 
  • The Food and Drug Administration (FDA) 
  • The Health Resources and Services Administration (HRSA) 
  • The Indian Health Service (IHS) 
  • The National Institutes of Health (NIH) 
  • The Substance Abuse and Mental Health Services Administration (SAMHSA) 

The Centers for Medicare and Medicaid Services (CMS) is by far the largest operating division of HHS. It oversees not just the Medicare and Medicaid programs, but also the federal Children’s Health Insurance Program (CHIP) and the health insurance portions of the Affordable Care Act. Together, the programs under the auspices of CMS account for nearly a quarter of all federal spending in fiscal 2023, cost an estimated $1.5 trillion in fiscal 2023, and served more than 170 million Americans – more than half the population.

The current Trump administration has proposed a major restructuring of the health agencies under HHS, including creation of a new “Administration for a Healthy America.” As of September 2025, that restructuring has been blocked by court action.  However, a data analysis conducted by the news organization ProPublica found that as of August 2025, more than 20,500 workers – about 18 percent of the department’s workforce – had been laid off or left their jobs.

How Congress oversees the federal health care-industrial complex is almost as byzantine as the U.S. health system itself. Jurisdiction and responsibility for various health agencies and policies is divided among more than two dozen committees in the House and Senate (Tables 1 and 2). 

In each chamber, however, three major committees deal with most health issues.  

In the House, the Ways and Means Committee, which sets tax policy, oversees Part A of Medicare (because it is funded by the Social Security payroll tax) and shares jurisdiction over other parts of the Medicare program with the Energy and Commerce Committee. Ways and Means also oversees tax subsidies and credits for the Affordable Care Act and tax policy for most employer-provided insurance.  

The Energy and Commerce Committee has sole jurisdiction over the Medicaid program in the House and shares jurisdiction over Medicare Parts B, C, and D with Ways and Means. Energy and Commerce also oversees the U.S. Public Health Service, whose agencies include the Food and Drug Administration, the National Institutes of Health, and the Centers for Disease Control and Prevention.  

While Ways and Means and Energy and Commerce are in charge of the policymaking for most of the federal government’s health programs, the actual amounts allocated for many of those programs are determined by the House Appropriations Committee through the annual Labor-Health and Human Services-Education and Related Agencies spending bill.  

In the Senate, responsibility for health programs is divided somewhat differently. The Senate Finance Committee, which, like House Ways and Means, is in charge of tax policy, oversees all of Medicare and Medicaid and most of the ACA.  

The Senate counterpart to the House Energy and Commerce Committee is the Senate Health, Education, Labor and Pensions Committee, which has jurisdiction over the Public Health Service (but not Medicare or Medicaid).  

The Senate Appropriations Committee, like the one in the House, sets actual spending for discretionary programs as part of its annual Labor-HHS-Education spending bill. 

Under Article 1 of the U.S. Constitution, Congress is granted the exclusive power to “lay and collect Taxes, Duties, Imposts and Excises, and to pay the Debts and provide for the common Defence and General Welfare of the United States.”  

In 1974, lawmakers passed the Congressional Budget and Impoundment Control Act in an effort to standardize the annual process for deciding tax and spending policy for each federal fiscal year and to prevent the executive branch from making spending policy reserved to Congress. Among other things, it created the House and Senate Budget Committees and set timetables for each step of the budget process.  

Perhaps most significantly, the 1974 Budget Act also created the Congressional Budget Office (CBO). This non-partisan agency has come to play a pivotal role in not just the budget process, but in the lawmaking process in general. The CBO issues economic forecasts, policy options, and other analytical reports, but it most significantly produces estimates of how much individual legislation would cost or save the federal government. Those estimates can and do often determine if legislation passes or fails.

The annual budget process is supposed to begin the first Monday in February, when the President is to present his proposed budget for the fiscal year that begins the following Oct. 1. This is one of the few deadlines in the Budget Act that is usually met. 

After that, the action moves to Congress. The House and Senate Budget Committees each write their own “Budget Resolution,” a spending blueprint for the year that includes annual totals for mandatory and discretionary spending. Because mandatory spending (roughly two-thirds of the budget) is automatic unless changed by Congress, the budget resolution may also include “reconciliation instructions” to the committees that oversee those programs (also known as “authorizing” committees) to make changes to bring the cost of the mandatory programs in line with the terms of the budget resolution. The discretionary total will eventually be divided by the House and Senate Appropriations Committees between the 12 subcommittees, each responsible for a single annual spending (appropriations) bill. Most of those bills cover multiple agencies – the appropriations bill for the Department of Health and Human Services, for example, also includes funding for the Departments of Labor and Education.  

After the budget resolution is approved by each chamber’s Budget Committee, it goes to the House and Senate floor, respectively, for debate. Assuming the resolutions are approved, a “conference committee” comprised of members from each chamber is tasked with working out the differences between the respective versions. A final compromise budget resolution is supposed to be approved by both chambers by April 15 of each year. (This rarely happens.) Because the final product is a resolution rather than a bill, the budget does not go to the President to sign or veto.  

The annual appropriations process kicks off May 15, when the House may start considering the 12 annual spending bills for the fiscal year that begins Oct. 1. By tradition, spending bills originate in the House, although sometimes, if the House is delayed in acting, the Senate will take up its own version of an appropriation first. The House is supposed to complete action on all 12 spending bills by June 30, in order to provide enough time to let the Senate act, and for a conference committee to negotiate a final version that each chamber can approve by October 1. 

That October 1 deadline is the only one with consequences if it is not met. Unless an appropriations bill for each federal agency is passed by Congress and signed by the President by the start of the fiscal year, that agency must shut down all “non-essential” activities funded by discretionary spending until funding is approved. Because Congress rarely passes all 12 of the appropriations bills by the start of the fiscal year (the last time was in 1996, for fiscal year 1997), it can buy extra time by passing a “continuing resolution” (CR) that keeps money flowing, usually at the previous fiscal year’s level. CRs can last as little as a day and as much as the full fiscal year and may cover all of the federal government (if none of the regular appropriations are done) or just the departments for the unfinished bills. Congress may, and frequently does, pass multiple CRs while it works to complete the appropriations process. 

While each appropriations bill is supposed to be considered individually, to save time (and sometimes to win needed votes), a few, several, or all the bills may be packaged into a single “omnibus” measure. Bills that package only a handful of appropriations bills are cheekily known as “minibuses.”  

Meanwhile, if the budget resolution includes reconciliation instructions, that process proceeds on a separate track. The committees in charge of the programs requiring alterations each vote on and report their proposals to the respective budget committees, which assemble all of the changes into a single bill. At this point, the budget committees’ role is purely ministerial; it may not change any of the provisions approved by the authorizing committees.  

Reconciliation legislation is frequently the vehicle for significant health policy changes, partly because Medicare and Medicaid are mandatory programs. Reconciliation bills are subject to special rules, notably on the Senate floor, which include debate time limitations (no filibusters) and restrictions on amendments. Reconciliation bills also may not contain provisions that do not pertain directly to taxing or spending. 

Unlike the appropriations bills, nothing happens if Congress does not meet the Budget Act’s deadline to finish the reconciliation process, June 15. In fact, in more than a few cases, Congress has not completed work on reconciliation bills until the calendar year AFTER they were begun.   

Congress writes the nation’s laws, but it cannot account for every detail in legislation. So, it often leaves key decisions about how to interpret and enforce those laws to the various executive departments. Those departments write (and often rewrite) rules and regulations according to a very stringent process laid out by the 1946 Administrative Procedure Act (APA). The APA is intended to keep the executive branch’s decision-making transparent and to allow public input into how laws are interpreted and enforced.

Most federal regulations use the APA’s “informal rulemaking” process, also known as “notice and comment rulemaking,” which consists of four main parts: 

• Publication of a “Notice of Proposed Rulemaking (NPRM)” in the Federal Register, a daily publication of executive branch activities. 
• Solicitation to the public to submit written comments for a specific period of time (usually from 30 to 90 days). 
• Agency consideration of public reaction to the proposed rule; and, finally 
• Publication of a final rule, with an explanation including how the agency took the public comments into account and what changes, if any, were made from the proposed rule. Final rules also include an effective date, which can be no less than 30 days but may be more than a year in the future. 

In situations where time is of the essence, federal agencies may truncate that process by issuing “interim final rules,” which can take effect even before the public is given a chance to comment. Such rules may or may not be revised later.  

Not all federal interpretation of laws uses the APA’s specified regulatory process. Federal officials also distribute guidance, agency opinions, or “statements of policy.” 

Given how fragmented health policy is in both Congress and the executive branch, it should not be a surprise that major changes are difficult and rare.  

Add to that an electorate divided over whether the federal government should be more involved or less involved in the health sector, and huge lobbying clout from various interest groups whose members make a lot of money from the current operation of the system, and you have a prescription for inertia. 

Sometimes change does happen suddenly, however. In 2025, Republicans in control of the House, Senate, and White House narrowly passed a budget reconciliation bill that is projected to make deep cuts to the Medicaid program as well as add new barriers for people to maintain or enroll in health insurance under the ACA.

Another potential wildcard—in June of 2024, the Supreme Court overturned a 40-year-old precedent, known as “Chevron deference,” that gave the benefit of the doubt in interpreting ambiguous laws passed by Congress to federal agencies rather than judges. Overturning Chevron will likely make it easier for outsiders to challenge federal agency actions, but it will be some time before the full ramifications become clear.   

Another problem is that when a new health policy can dodge the minefield of obstacles to become law, it almost by definition represents a compromise that may help it win enough votes for passage, but is more likely to complicate an already byzantine system further. 

Unless the health system completely breaks down, it seems unlikely that federal policymakers will be able to move the needle very far in either a conservative or a liberal direction, although the second Trump administration is attempting to circumvent Congress entirely to remake federal health agencies and how they work. Whether that will withstand review by the courts remains to be seen.

• FAQs on Health Spending, the Federal Budget, and Budget Enforcement Tools
• Medicare 101
• Medicaid 101
• The Affordable Care Act 101
• Employer-Sponsored Health Insurance
• The Regulation of Private Insurance
• U.S. Public Health
• The U.S. Government and Global Health
• The U.S. Congress and Global Health: A Primer

Rovner, J., Congress, the Executive Branch, and Health Policy. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-congress-and-the-executive-branch-and-health-policy/ (date accessed).

Health coverage in the United States is marked by a blend of private and public insurance options that leaves about 8% of the population uninsured. This coverage system has evolved over the years, most recently with the implementation of the Affordable Care Act (ACA), which aimed to reduce the uninsured rate by expanding Medicaid, creating health insurance Marketplaces for individuals, and providing subsidies to make the coverage more affordable. Many factors, including economic conditions, federal and state policy changes, and significant health crises, such as the COVID-19 pandemic, influence the uninsured rate. The ACA and policy changes designed to protect coverage during the pandemic led to increased health coverage overall; however, passage of the 2025 Federal Budget Reconciliation Bill (referred to as the One Big Beautiful Bill Act) along with other policy changes are expected to increase significantly the number of people who are uninsured over the next ten years.

Health coverage in the U.S. is a complex patchwork of private and public insurance coverage options. In 2023, most residents had private insurance coverage, with nearly half covered by an employer-based plan. About 1 in 5 U.S. residents received coverage through the Medicaid program, the federal and state-financed comprehensive health coverage program for low-income people. Another roughly 15% of the population had health coverage from the federal Medicare program, which covers seniors and people under age 65 with long-term disabilities. About 6% of the population had private non-group insurance either purchased through the ACA Marketplace or off-market, and just over 1% of the population was covered through the military’s TRICARE or VA health care programs. The uninsured rate for the total population was 7.9% for the year (Figure 1). (In some cases, people have multiple forms of coverage. For example, about 12 million people are enrolled in both Medicare and Medicaid and are classified in these figures as covered by Medicaid.)

In 2023, there were 25.3 million uninsured residents ages 0-64, and the uninsured rate among the population ages 0-64 was 9.5%, the lowest rate in U.S. history (Figure 2). The analysis of the uninsured population focuses on coverage among people ages 0-64 since Medicare offers near-universal coverage for seniors—just 457,000, or less than 1%, of people over age 65 were uninsured.

Prior to the implementation of the ACA, gaps in the public insurance system and lack of access to affordable private coverage left over 40 million people without health insurance. The ACA expanded Medicaid coverage to nearly all adults with incomes up to 138% of the federal poverty level (FPL) (the poverty level in the continental U.S. is $15,650 for a single individual in 2025) and created new health insurance Marketplaces through which individuals can purchase coverage with financial help to afford premiums and cost-sharing. Following the passage of the ACA in 2010 and the rollout of the coverage provisions, the number of uninsured people ages 0-64 dropped to 27 million in 2016. The ACA envisioned that all states would adopt the Medicaid expansion; however, a Supreme Court ruling in 2012 made expansion optional for states. As of early 2025, 40 states and Washington, D.C. had adopted the ACA’s Medicaid expansion (Figure 3).

The declines in uninsured rates following implementation of the ACA coverage expansions were largest among poor and near-poor individuals, particularly adults. People of color, who had higher uninsured rates than White people prior to 2014, had larger coverage gains from 2013 to 2016 than White people, although the coverage disparities were not eliminated.

Before implementation of the ACA, expansions of Medicaid coverage and the enactment of the Children’s Health Insurance Program (CHIP) helped to lower the uninsured rate for children. Changes in the 1980s and early 1990s expanded Medicaid eligibility levels for children and pregnant people, and the establishment of CHIP in 1997 provided coverage for children with incomes above Medicaid thresholds. When states implemented CHIP, extensive outreach efforts along with the adoption of streamlined processes facilitated enrollment of children in Medicaid and CHIP and reduced the number of uninsured children.

After declining through 2016, the number of uninsured people and the uninsured rate began increasing in 2017 and continued to grow through 2019. Generally favorable economic conditions as well as policy changes during the Trump Administration, such as reduced funding for outreach and enrollment assistance, encouraging periodic Medicaid eligibility checks, changes to immigration policy related to public charge rules, and approval of some demonstration waivers to restrict enrollment led to a decline in Medicaid enrollment, which likely contributed to the increase in uninsured people.  

With the arrival of the COVID-19 pandemic, policies adopted to protect coverage drove a decline in the uninsured population from 2019 to 2023. The Families First Coronavirus Response Act required states to keep people continuously enrolled in Medicaid in exchange for enhanced federal funding. Medicaid continuous enrollment ended in March 2023, and most states completed renewals for individuals who enrolled during continuous enrollment by December 2024. In addition, the American Rescue Plan Act (ARPA) provided temporary enhanced ACA Marketplace subsidies to make Marketplace coverage more affordable, and these subsidies were renewed for another three years in the Inflation Reduction Act of 2022. These enhanced subsidies will expire at the end of December 2025 unless Congress acts to extend them.

Most people who are uninsured are adults under age 65, are in working low-income families, are people of color, and, reflecting geographic variation in income, immigration status, and the availability of public coverage, live in the South or West. In 2023, over 8 in 10 people ages 0-64 who were uninsured were adults and 16% were children.

Nearly three-quarters (73.7%) of the uninsured population ages 0-64 had at least one full-time worker in their family and an additional 11.2% had a part-time worker in their family (Figure 4). More than 8 in 10 (80.9%) people ages 0-64 who were uninsured were in families with incomes below 400% FPL in 2023 and nearly half (46.7%) had incomes below 200% FPL. People of color comprised 62.9% of the uninsured population ages 0-64 in 2023 despite making up about 46% of residents ages 0-64. Most uninsured individuals (74.2%) were U.S. citizens, while 25.8% were noncitizens in 2023. Nearly three-quarters lived in the South and West.

Adults ages 19 to 64 are more likely to be uninsured than children. The uninsured rate among children (5.3%) was less than half the rate among adults ages 19-64 (11.1%) in 2023, largely due to the broader availability of Medicaid and CHIP coverage for children than for adults. Among adults ages 19-64, men had higher uninsured rates than women in 2023 (12.6% vs. 9.5%).

Reflecting persistent disparities in coverage, people of color are generally more likely to be uninsured than White people. In 2023, American Indian and Alaskan Native (AIAN) and Hispanic people ages 0-64 had the highest uninsured rates at 18.7% and 17.9%, respectively, which were nearly three times higher than the uninsured rate for White people (6.5%). Uninsured rates for Native Hawaiian or Pacific Islander (NHPI) (12.8%) and Black people (9.7%) ages 0-64 were also higher than the rate for their White counterparts (Figure 5). These differences in uninsured rates are driven by lower rates of private coverage among these groups. Medicaid coverage helps to narrow these differences but does not fully offset them.

Noncitizens are more likely than citizens to be uninsured. Nearly one-third of noncitizen immigrants were uninsured in 2023 while the uninsured rate for U.S.-born citizens was 7.5% and 8.9% for naturalized citizens. One in 4 children has an immigrant parent, including over 1 in 10 (12%) who are citizen children with at least one noncitizen parent.

Uninsured rates vary by state and by region and were generally higher in states that had not taken up the ACA Medicaid expansion in 2023 (Figure 6). Economic conditions, availability of employer-sponsored coverage, and demographics are other factors contributing to variation in uninsured rates across states.

The fragmented U.S. health coverage system leads to gaps in coverage. While employer-based insurance is the prevalent source of coverage for the population ages 0-64, not all workers are offered coverage by their employer or, if offered, can afford their share of the premiums. Medicaid covers many low-income individuals, especially children, but eligibility for adults remains limited in most states that have not adopted the ACA Medicaid expansion. While subsidies for Marketplace coverage are available for many low and moderate-income people, few people can afford to purchase private coverage without financial assistance.

The cost of health coverage and care poses a challenge for the country broadly and is a significant barrier to coverage for people who are uninsured. In 2023, 63.2% of uninsured adults ages 18-64 said they were uninsured because coverage is not affordable, making it the most common reason cited for being uninsured (Figure 7). Other reasons included not being eligible for coverage (27.0%), not needing or wanting coverage (26.6%), and signing up being too difficult (23.9%).

Not all workers have access to coverage through their jobs. In 2023, 64.7% of uninsured workers worked for an employer that did not offer them health benefits. Among uninsured workers who are offered coverage by their employers, cost is often a barrier to taking up the offer. Low-income families with employer-based coverage spend a significantly higher share of their income toward premiums and out-of-pocket medical expenses compared to those with income above 200% FPL.

A decade after the implementation of the ACA coverage options, 10 states have not adopted the Medicaid expansion, leaving 1.4 million uninsured people without an affordable coverage option. A coverage gap exists in states that have not adopted the expansion for poor adults who earn too much to qualify for Medicaid coverage but not enough to be eligible for subsidies in the Marketplace.

Lawfully-present immigrants generally must meet a five-year waiting period after receiving qualified immigration status before they can qualify for Medicaid. States have the option to cover eligible children and pregnant people without a waiting period, and as of January 2025, 38 states have elected the option for children, and 32 states have taken up the option for lawfully-present pregnant individuals. Under current law, lawfully-present immigrants are eligible for Marketplace tax credits, including those who are not eligible for Medicaid because they have not met the five-year waiting period. Undocumented immigrants are ineligible for federally-funded coverage, including Medicaid and Marketplace coverage, although some states provide fully state-funded health coverage to these individuals.

Health care provisions in the 2025 reconciliation package narrow eligibility for federally-subsidized health coverage, including Medicaid and CHIP, Medicare, and Marketplace subsidies, to a limited group of lawfully-present immigrants. These changes take effect on January 1, 2027 and are expected to increase the number of lawfully residing immigrants without health coverage.

Though financial assistance is available to many of the remaining uninsured under the ACA, not everyone who is uninsured is eligible for free or subsidized coverage. Nearly 6 in 10 (14.5 million) uninsured individuals in 2023 were eligible for financial assistance through Medicaid or subsidized Marketplace coverage (Figure 8). However, over 4 in 10 uninsured (10.9 million) were outside the reach of the ACA because their state did not expand Medicaid, their immigration status made them ineligible, or they were deemed to have access to an affordable Marketplace plan or offer of employer coverage (Figure 8).

Lacking health insurance in the United States can impact a person’s access to health care, their financial situation, and their health status. It can also broadly impact a community’s public health (illustrated by the COVID-19 pandemic) and the economy through lower productivity.

Adults who are uninsured are almost five times more likely than adults with insurance to report not having a usual source of care, which is often a key entry point for accessing health care whether for preventive services or for treating existing conditions. Consequently, in 2023, nearly half (46.6%) of uninsured adults ages 18-64 reported not seeing a doctor or health care professional in the past 12 months compared to 15.6% with private insurance and 14.2% with public coverage (Figure 9). Uninsured individuals are also more likely to face cost barriers to accessing needed care. In 2023, uninsured adults were nearly three times more likely to report not getting medical care due to cost compared to publicly insured adults and four times more likely than privately insured adults (22.6% vs 7.7% and 5.1%, respectively).

The lack of access to health care and a delay in seeking care due to costs mean uninsured people are more likely to be hospitalized for avoidable health problems and to experience declines in their overall health. Research also shows that when they are hospitalized, uninsured people receive fewer diagnostic and therapeutic services and have higher mortality rates than those with insurance.

Uninsured individuals often face unaffordable medical bills when they do seek care, which can lead to medical debt and other forms of financial instability. Nearly half of uninsured adults reported difficulty paying for health care, compared to 21% of insured adults and over 8 in 10 (84%) uninsured adults said they worried that health care costs would put them in debt or increase their existing debt, compared to 71% of adults with insurance (Figure 10). Uninsured adults are also more likely to face negative consequences due to health care debt, such as using up savings, having difficulty paying other living expenses, or borrowing money.

Driven by pandemic-era policies to promote health coverage, the number of people without insurance and the uninsured rate dropped to historic lows in recent years. Although millions of people lost Medicaid coverage during the unwinding of continuous enrollment, Medicaid enrollment remains higher than in February 2020, before the start of the pandemic. Enhanced Marketplace subsidies adopted during the pandemic led to record Marketplace signups, with enrollment topping 25 million in 2025. States have also taken action to reduce the number of people who are uninsured. In 2023, two states, North Carolina and South Dakota, newly adopted the Medicaid expansion, and several states have expanded state-funded coverage for certain individuals regardless of immigration status.

However, actions by Congress and the Trump Administration threaten to reverse these recent coverage gains. Congress passed the 2025 Federal Budget Reconciliation package on July 3, 2025, which makes significant changes to Medicaid and ACA Marketplaces, and President Trump signed the reconciliation package into law on July 4, 2025.  The Congressional Budget Office (CBO) estimates that the law will increase the number of people without health insurance by 10 million. The expiration of the enhanced premium tax credits for Marketplace enrollees, which will happen at the end of 2025 unless Congress takes action to extend them, will further increase the number of people without health insurance. CBO projects that over 14 million more people will be uninsured in 2034 due to the combined effects of the reconciliation package and the expiration of the enhanced Marketplace subsidies. In addition to these potential coverage losses, the Trump administration’s increased immigration enforcement activities are likely to have a broad chilling effect that could cause immigrants to decide to disenroll or not enroll themselves or their children, most of whom are U.S. citizens, in health coverage programs even if they are eligible due to immigration-related fears.

Enactment of the ACA helped close some gaps in our fragmented health coverage system and led to a significant decline in the number of people who were uninsured. Recent efforts built on that success to further shrink the share of people without insurance. Yet, despite this success and the ACA’s continued favorability—the public has a favorable view of the ACA by a 2 to 1 margin—policymakers enacted cuts to federal support for Medicaid and ACA coverage to fund other budget priorities. The impact on health coverage and people’s ability to access needed health care services will be significant.

• Key Facts about the Uninsured Population 
• How Many Uninsured Are in the Coverage Gap and How Many Could be Eligible if All States Adopted the Medicaid Expansion?
• A Closer Look at the Remaining Uninsured Population Eligible for Medicaid and CHIP
• Health Coverage by Race and Ethnicity, 2010-2023
• Key Facts on Health Coverage of Immigrants
• How Does Cost Affect Access to Health Care?
• State-Funded Health Coverage for Immigrants
• How Will the One Big Beautiful Bill Act Affect the ACA, Medicaid, and the Uninsured Rate?

Tolbert, Jennifer, Bell, Clea, Cervantes, Sammy & Singh, Rakesh, The Uninsured Population and Health Coverage. In Altman, Drew (Editor), Health Policy 101, (KFF, October 2025) https://www.kff.org/health-policy-101-the-uninsured-population-and-health-coverage/ (date accessed).