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Affordable Care Act

The ACA MarketplaceS

Change in February effectuated enrollment, by state, 2025-2026

How Has ACA Marketplace Enrollment Changed Across States in 2026?

ACA Marketplace enrollment fell this year in every state except New Mexico, which was the only state to fully replace the enhanced premium tax credits that expired last year with a state-funded subsidy, according to a new KFF analysis of effectuated enrollment data. The Marketplace enrollment decline—the first in seven years—follows several years of rapid enrollment growth and coincides with the end of the enhanced federal subsidies.

How Much and Why ACA Marketplace Premiums Are Going Up in 2027

ACA Marketplaces insurers are proposing a median premium increase of 15% in 2027, according to KFF’s updated analysis of 276 insurers with publicly available filings across all 50 states and the District of Columbia. This is the second consecutive year of double-digit premium hikes. Last year’s median nationwide proposed rate change was 18%, and the median finalized rate change was 20%. While this proposed rate change is lower than last year, it represents the second-highest requested rate change since 2018, as premium growth had been relatively flat in this market for several years.

About the ACA

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Did the Affordable Care Act Make Health Care More Affordable?

The expiration of the ACA’s enhanced premium tax credits at the start of 2026, combined with rising insurer premiums, put a spotlight on health care affordability that extends beyond Marketplace enrollees. KFF’s Cynthia Cox examines the ACA’s record and the broader underlying question it raises: what’s a fair price for Americans people to pay for health care?

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  • Summary of Coverage Provisions in the Patient Protection and Affordable Care Act

    Issue Brief

    This short summary describes the health coverage provisions contained in the final version of the Affordable Care Act signed into law in March 2010, including the individual mandate requirements, expansion of public programs, health insurance exchanges, changes to private insurance and employer requirements.

  • Explaining Health Reform: Key Changes in the Medicare Advantage Program

    Issue Brief

    This brief examines the changes in the 2010 health reform law affecting the Medicare Advantage program, which gives beneficiaries the option of enrolling in private insurance plans for their Medicare benefits, instead of the traditional fee-for-service program. The reform law will gradually reduce Medicare payments to these plans to bring the average payment closer to the costs of traditional fee-for-service Medicare, while rewarding plans with high-quality ratings. The brief also describes new benefit requirements for…

  • State Budgets Under Federal Health Reform: The Extent and Causes of Variations in Estimated Impacts

    Issue Brief

    This analysis examines the potential costs and savings that the health reform law may generate for state budgets, a topic of great interest at a time when states continue to struggle with tight budgets in the wake of the recession. The analysis seeks to explain why recent state estimates of the likely impact of health reform on their budgets vary widely, and discusses the major expected sources of costs and savings as the new law…

  • Pulling it Together: The Most Popular Provision in the ACA?

    Perspective

    In our most recent monthly tracking poll, we asked the American people what elements of the health reform law they like and dislike. Surprisingly, the runaway favorite was a relatively obscure requirement that health plans provide consumers with a short, easy to understand description of their benefits and coverage. Sixty percent of the American people gave this requirement for greater transparency in health insurance benefits a very favorable rating, the only provision in the law…

  • The Cost and Coverage Implications of the ACA Medicaid Expansion: National and State-by-State Analysis

    Report

    A central goal of the Patient Protection and Affordable Care Act (ACA) is to significantly reduce the number of uninsured by providing a continuum of affordable coverage options through Medicaid and new Health Insurance Exchanges. Following the June 2012 Supreme Court decision, states face a decision about whether to adopt the Medicaid expansion. These decisions will have enormous consequences for health coverage for the low-income population. This analysis uses the Urban Institute’s Health Insurance Policy…

  • Covering the Uninsured: Options for Reform

    Issue Brief

    Download PDF Key Facts on the Uninsured In 2007, 45 million nonelderly people in the United States lacked health coverage More than eight in ten uninsured people (81%) come from working families About two-thirds of the nonelderly uninsured are from low-income families (income below 200% of poverty, about $42,400 for a family of 4 in 2007) More than one in three people (35%) living in poverty are uninsured, compared with one in twenty people (5%)…

  • The Decline in the Uninsured in 2007: Why Did It Happen and Can It Last?

    Issue Brief

    This policy brief examines the underlying shifts in health insurance coverage in 2007, which resulted in a 1.5 million decrease in the number of uninsured people under age 65, due to increased public coverage. This includes about 300,000 in Massachusetts, which implemented its comprehensive health reform that year. The brief also projects that the current economic downturn and rising unemployment rate likely will cause the number of uninsured to grow by at least 2 million…

  • Health Affairs Article: Beyond Incrementalism? SCHIP and the Politics of Health Reform

    Report

    This article examines the political and legislative history of the Children's Health Insurance Program and analyzes the lessons for policymakers who are contemplating broader health care reform. It was published online in the journal Health Affairs and was authored by Jonathan Oberlander, an associate professor, social medicine and health policy and management, at the University of North Carolina at Chapel Hill, and Barbara Lyons, a vice president of the Kaiser Family Foundation and deputy director…

  • Explaining Health Care Reform: What is Health Insurance?

    Issue Brief

    A key element in any comprehensive health reform plan is defining what health insurance is and the amount of insurance coverage people will have. There are two components to that coverage: the types of services covered (e.g., physician care, hospitalization, prescription drugs, etc.), and the cost sharing required of enrollees (e.g., the annual deductible, the copayments or coinsurance, and the maximum out-of-pocket costs for a year). The overall approach to reform drives the kinds of…

  • Explaining Health Care Reform: How Might a Reform Plan Be Financed?

    Issue Brief

    One of the key challenges in enacting a health care reform plan is how to finance it among government, employers, and individuals. Of particular concern to policymakers is what effect a health reform plan would have on government spending and the federal budget. President Obama and Congressional leaders have said that any health reform plan should not add to the budget deficit over a 10 year period. This brief explains the likely sources of added…