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The ACA Marketplace

2025 KFF Marketplace Enrollees Survey

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, according to a KFF survey conducted in 2025.

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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.

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  • 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…

  • Two Medicaid-Related Initiatives That Help Promote Long-Term Care at Home and in the Community, Rather Than in Institutions, Are Set To Expire at the End of December

    News Release

    Two initiatives that for years have helped shift Medicaid enrollees away from nursing homes in favor of long-term care at home and in the community face year-end deadlines that could undercut that trend, according to two new KFF issue briefs. While there does not appear to be substantive disagreement over the initiatives like there is with many other federal health programs, their expiration is coming at a time when Congress is engaged in a contentious…

  • Surprise Bills Often Hit in Emergencies

    From Drew Altman

    In an Axios column, Drew Altman previews new data highlighting that people with critical health issues are especially vulnerable to these bills. 

  • About 1 in 6 Emergency Visits and Hospital Stays Had At Least One Out-of-Network Charge in 2017

    News Release

    In roughly 1 of every 6 emergency room visits and inpatient hospital stays in 2017, patients came home with at least one out-of-network medical bill, a new KFF analysis finds. More specifically, 18 percent of all emergency visits and 16 percent of in-network hospital stays had at least one out-of-network charge, leaving patients at risk for surprise medical bills, according to the analysis of claims data from large employer plans. The analysis also finds the…

  • Key State Policy Choices About Medical Frailty Determinations for Medicaid Expansion Adults

    Issue Brief

    This issue brief answers 3 key questions and provides new data about state medical frailty determinations, which are assuming greater importance as more states adopt restrictive Section 1115 waivers that exempt medically frail enrollees from policies such as work requirements and premiums. The findings are excerpted from our 50-state survey on Medicaid financial eligibility for seniors and people with disabilities.

  • State Actions to Improve the Affordability of Health Insurance in the Individual Market

    Issue Brief

    A number of states have taken steps to provide consumers with more affordable coverage options in the individual market, including the marketplaces. Some states are implementing strategies that lower premiums by building on, and increasing the stability of the individual market, while other states are expanding the availability of lower cost coverage sold outside the marketplaces that does not comply with ACA standards—an approach that could increase marketplace premiums further. This brief examines these different…

  • 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,…