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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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  • New Survey Finds 72% of Previously Uninsured Californians Now Have Coverage, Including 78% of Those Eligible for New Affordable Care Act Options

    News Release

    For Remaining Uninsured Residents, Cost and Immigration Status Are Main Obstacles Three years after the Affordable Care Act’s coverage expansions were fully implemented in California, nearly three quarters (72%) of the state’s previously uninsured residents now have health coverage, finds the fourth Kaiser Family Foundation Longitudinal Panel Survey, which is tracking the experiences of a randomly selected group of Californian adults who were uninsured in 2013. This is similar to the share who reported having insurance…

  • The ACA Marketplace Problems in Context (and Why They Don’t Mean Obamacare Is ‘Failing’)

    From Drew Altman

    In this Wall Street Journal Think Tank column, Drew Altman discusses the latest challenges faced by the Affordable Care Act (ACA) marketplaces and why they should be kept in perspective: “If Obamacare had bipartisan support, they would be treated much more like mundane implementation issues to be addressed by Congress than glaring headlines about Obamacare failure.”

  • Data Note: Effect of State Decisions on State Risk Scores

    Issue Brief

    To gauge whether individual market risk pools are healthier in states that have expanded Medicaid and did not allow transitional plans, this data note compares average state risk scores using data from the Centers for Medicare & Medicaid Services Summary Report on Risk Adjustment for the 2015 benefit year. The analysis finds that states that expanded Medicaid and did not allow transitional plans had lower average risk scores, suggesting the risk pools in those state’s…

  • At Tax Time, No Public Backlash Over Obamacare’s Individual Mandate

    From Drew Altman

    This was published as a Wall Street Journal Think Tank column on April 21, 2015. Tax season has come and gone with no great outbreak of protest about the Affordable Care Act’s least popular provision: the individual mandate. This central element of the ACA was included to help ensure that the individual insurance market would have balanced pools of healthier people and sicker people to help spread insurance risk and keep premiums reasonable. While most of the…

  • Data Note: How Has the Individual Insurance Market Grown Under the Affordable Care Act?

    Issue Brief

    This data note examines changes in the individual insurance market under the Affordable Care Act. Through analysis of filings by insurers to state insurance departments, the Kaiser Family Foundation estimates that the number of people enrolled in the individual insurance market grew 40 percent from the end-of-year 2013 to the end-of-year 2014 and has likely continued growing in 2015 as well.

  • Medicaid Expansion, Health Coverage, and Spending: An Update for the 21 States That Have Not Expanded Eligibility

    Issue Brief

    Ever since the Supreme Court ruled in June 2012 that states could effectively choose whether or not to accept the Affordable Care Act’s expansion of Medicaid eligibility, that choice has been one of the most prominent and often one of the most contentious issues for states. In this report, we provide new projections of the impact of Medicaid expansion on health coverage, Medicaid enrollment, and costs in states that have not expanded Medicaid.

  • Americans’ Health Priorities Diverge From Washington’s Focus on Obamacare

    News Release

    In his latest column for The Wall Street Journal's Think Tank, Drew Altman finds the public’s health-care priorities have more to do with drug costs and other real-world issues people deal with using the health-care system than the ongoing partisan wrangling over the Affordable Care Act. All previous columns by Drew Altman are available online.

  • Briefing on the ACA in CA: Year One & Beyond

    Event Date:
    Event

    Continuing an effort to explore Affordable Care Act (ACA) implementation in the states, the Kaiser Family Foundation and the Blue Shield of California Foundation examined ACA implementation in California (CA) at a Sacramento, Calif. briefing and panel discussion on May 28. A state official, experts and advocates discussed issues and challenges related to implementation of the law, and the practical impact of providing coverage to roughly 4.5 million Californians who have coverage via the state…

  • Coverage Expansions and the Remaining Uninsured: A Look at California During Year One of ACA Implementation

    Report

    California is a bellwether state for understanding the impact of the Affordable Care Act (ACA). Much attention has been paid to enrollment in California's new coverage options, such as the Medicaid expansion (Medi-Cal) and plans sold through ACA marketplaces (Covered California), and to changes in the uninsured from 2013 to 2014. However, less is known about how this coverage has affected people’s access to care and financial security, and why others remain uninsured. This report,…