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KFF’s policy research provides facts and analysis on a wide range of policy issues and public programs.
KFF designs, conducts and analyzes original public opinion and survey research on Americans’ attitudes, knowledge, and experiences with the health care system to help amplify the public’s voice in major national debates.
KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the organization’s core operating programs.
State Health Facts is a KFF project that provides free, up-to-date, and easy-to-use health data for all 50 states, the District of Columbia, and the United States. It offers data on specific types of health insurance coverage, including employer-sponsored, Medicaid, Medicare, as well as people who are uninsured by demographic characteristics, including age, race/ethnicity, work status, gender, and income. There are also data on health insurance status for a state's population overall and broken down by age, gender, and income.
This analysis apportions the increase in the number of uninsured across the 50 states and DC. CBO estimates that the reconciliation law will increase the number of uninsured by 10M in 2034 and rise to over 14M if enhanced premium tax credits for ACA Marketplace enrollees expire later this year.
On June 27, 2025, the U.S. Supreme Court issued its opinion on Kennedy v. Braidwood Management, ruling that the ACA requirement that most private insurers and Medicaid expansion programs cover preventive services recommended by the United States Preventive Services Task Force (USPSTF) with no cost-sharing is constitutional.
This brief uses 2021 Medicaid claims data to examine utilization among Medicaid expansion adults and estimate how much cost sharing these enrollees could be required to pay under the new requirement if all states imposed the maximum cost sharing amounts. This is an illustrative analysis intended to describe which enrollees may be subject to the most cost sharing under the new provisions rather than estimate exactly what expansion enrollees may actually pay.
To understand the impact of Medicaid work requirements included in the budget reconciliation bill being debated in Congress, KFF has undertaken two different analyses using different data sources. Using 2023 data from the Survey of Income and Program Participation, this analysis looks at the share of adults who work at least 80 hours per month, the reasons some do not, and how consistently individuals meet the requirement over a six-month period.
In a new column, Dr. Drew Altman, KFF's President and CEO, examines the different counts of the number of people on Medicaid that are currently in use, which range from 69 to 83 million, and why it might matter. He also discusses other ways to assess the reach of the program: “possibly it’s useful to explain why there are different numbers out there about what seemingly is an all-time simple question: how many people are on Medicaid,” Altman says.
This brief looks at changes to Marketplace plans recently finalized by the Centers for Medicare and Medicaid Services (CMS) that may incentivize insurers to make their plans less generous. With less generous plans, consumers could face higher out-of-pocket costs, though those who don't qualify for premium tax credits could see lower premiums.
This analysis details the number of people who would become uninsured from policy changes in the ACA Marketplaces and Medicaid. The Congressional Budget Office estimates that, taken together, these changes will result in 16 million more uninsured people in the year 2034 than would otherwise be the case.
This chart examines individual market enrollment data from 2011 through 2025, when enrollment reached a record high of 25.2 million people. Affordable Care Act (ACA) Marketplace enrollment increased following the enactment of enhanced premium tax credits in 2021, as more individuals became eligible for subsidies.
This analysis examines the potential impacts of a provision in the House reconciliation bill that proposes reducing the federal matching rate for the Affordable Care Act (ACA) Medicaid expansion population from 90% to 80% for states that either provide health coverage or financial assistance to purchase health coverage to individuals who are not “a qualified alien.”
The Biden administration finalized several major Medicaid regulations with the intent of improving access to Medicaid services. Collectively, the rules span hundreds of pages of text, are extremely complex, and were set to be implemented over several years, with measurable increases in federal Medicaid spending. Overturning the rules would reduce regulation of managed care companies, nursing facilities, and other providers; increase barriers to enrolling in and renewing Medicaid coverage, and roll back enrollee protections, payment transparency, and requirements for improved access.
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