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Affordable Care Act

The ACA Marketplace

2025 KFF Marketplace Enrollees Survey

In 2025, about one in three ACA enrollees said they would be “very likely” to look for a lower-premium Marketplace plan If their premium payments doubled.

Cost Concerns and Coverage Changes: A Follow-Up Survey of ACA Marketplace Enrollees

Following the expiration of the enhanced premium tax credits for people with Affordable Care Act (ACA) Marketplace plans, a new KFF follow-up survey of the same Marketplace enrollees KFF surveyed in 2025 finds half (51%) of returning enrollees say their health care costs are “a lot higher” this year compared to last year, including four in 10 who specifically say their premiums are “a lot higher.”

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POLLING

Tracking the Public’s Views on the ACA

While overall opinion of the Affordable Care Act has been more favorable than unfavorable since 2017, there remain deep partisan divides. See how public opinion on the ACA has changed from the inception of the law to the present. This interactive tool highlights key moments when views shifted and trends based on party identification, income, age, gender, and race/ethnicity.
DATA

Marketplace Enrollment is Down in 2026—But All of the Data Isn’t in Yet

ANALYSIS

Higher Premium Payments or Higher Deductibles: The ACA's Tradeoffs

QUIZ

Test Your Knowledge of the Affordable Care Act

ANALYSIS

Competition Increased in Individual Market But Fell in Fully Insured Group Markets

Timely insights and analysis from KFF staff

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  • Trends in Employer-Sponsored Insurance Offer and Coverage Rates, 1999-2014

    Issue Brief

    This issue brief uses data from the National Health Interview Survey (NHIS) to examine trends in employer-sponsored health insurance (ESI) for different of individuals and households in the United States. While ESI remains the leading source of coverage for nonelderly people, the percentage covered by an employer plan has declined over the past 15 years. A similar pattern exists with firm offer rates; fewer workers were offered health insurance from their employer in 2014 than in 1999. Families with low and modest incomes have been most affected by these declines.

  • Surprise Medical Bills

    Issue Brief

    This brief explores the problem of "surprise medical bills" -- charges arising when an insured individual inadvertently receives care from an out-of-network provider. It reviews studies on the extent of the issue, including Kaiser Family Foundation polling data, and outlines state and federal policy responses, including rules and proposed rules for Medicare and plans in Affordable Care Act marketplaces.

  • How has the ACA Medicaid Expansion Affected Providers Serving the Homeless Population: Analysis of Coverage, Revenues, and Costs

    Issue Brief

    To further understand how the first full year of Medicaid expansion has affected patients who are homeless and the providers who care for them, this analysis uses data from the Uniform Data System (UDS) for health centers to examine changes in insurance coverage, revenues and costs among Health Care for the Homeless (HCH) projects serving the homeless population.

  • Assessing ACA Marketplace Enrollment

    Issue Brief

    This analysis examines factors that may have kept 2016 enrollment in Affordable Care Act (ACA) marketplace plans from reaching early projections, and it estimates that sign-ups will continue to grow modestly in coming years.

  • Outreach and Enrollment Strategies for Reaching the Medicaid Eligible but Uninsured Population

    Issue Brief

    This brief identifies a range of successful strategies to reach and enroll Medicaid- and CHIP-eligible individuals as well as options to facilitate renewals. It draws on a collection of previous work examining state enrollment experiences after implementation of the ACA. In sum, it shows that states that have achieved enrollment success have embraced an array of strategies and approaches that include promoting the expansion through strong leadership and collaboration, implementing broad marketing and outreach campaigns, establishing a coordinated and diverse network of assisters, developing effective eligibility and enrollment systems that coordinate with the Marketplace, and planning ahead to translate coverage gains into improved access to care.

  • Medicaid Expansion Waivers: What Will We Learn?

    Issue Brief

    Section 1115 waivers authorize research and demonstration projects that, in the view of the Health and Human Services (HHS) Secretary, further the purposes of the Medicaid program. The ACA implemented new requirements for these waivers, including that states must have a publicly available, approved evaluation strategy. This brief examines some of the major research questions and hypotheses relevant to the federal and state evaluations of Medicaid expansion Section 1115 waivers and explores key challenges that may hamper research and evaluation efforts.

  • Medicare-for-All vs. Single Payer: The Impact of Labels

    News Release

    In his latest column for The Wall Street Journal’s Think Tank, “Medicare-for-All vs. Single Payer: The Impact of Labels”, Drew Altman uses new polling on a Medicare-for-all or single payer health system to explain how what you call a health reform plan can substantially affect the public’s response. All previous Drew Altman columns are online.

  • Medicare-for-All vs. Single Payer: The Impact of Labels

    From Drew Altman

    In this column for The Wall Street Journal’s Think Tank, "Medicare-for-All vs. Single Payer: The Impact of Labels", Drew Altman uses new polling on a Medicare-for-all or single payer health system to explain how what you call a health reform plan can substantially affect the public's response.