More than a decade after its enactment, tens of millions of people nationwide rely on coverage options created through the Affordable Care Act of 2010 (ACA). The law has survived multiple court challeges at the U.S. Supreme Court and repeated attempts by Republicans in Congress to repeal it. Subsequent legislation has scaled back some aspects of the law and expanded others, including by the COVID-19 relief bill, the American Response Plan Act of 2021. This page highlights relevant analysis about the ACA and proposed and enacted changes to it..

For information about ACA Marketplace Open Enrollment, including fact sheets and 300+ FAQs, visit our collection of resources on Understanding Health Insurance.

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“Partial Medicaid Expansion” with ACA Enhanced Matching Funds: Implications for Financing and Coverage

The Affordable Care Act (ACA) provides enhanced federal matching funds to states that expand Medicaid to nonelderly adults up to 138% of the federal poverty level (FPL, $17,236/year for an individual in 2019). The ACA enhanced match (93% in 2019, and 90% in 2020 and thereafter) is substantially higher than states’ traditional Medicaid matching rate. A few states have sought Section 1115 demonstration waiver authority from the Centers for Medicare and Medicaid Services (CMS) to receive the substantially higher ACA enhanced match while limiting coverage to individuals at 100% FPL, instead of covering the full 138% FPL ACA group. To date, CMS has allowed states to receive the ACA enhanced Medicaid matching funds only if the entire expansion group is covered. CMS has not approved waiver requests seeking enhanced ACA matching funds for a partial coverage expansion in Arkansas or Massachusetts, while a request is pending in Utah. This brief explores the current rules for partial expansion and explains some of the potential implications for financing and coverage if CMS approves waivers to allow for partial expansion with enhanced matching funds.

KFF Health Tracking Poll – April 2019: Surprise Medical Bills and Public’s View of the Supreme Court and Continuing Protections for People With Pre-Existing Conditions

The April 2019 KFF Health Tracking Poll examines the public’s position on the future of ACA and its protections for people with pre-existing medical conditions, in light of the ongoing legal battle which may end up in the Supreme Court. With lawmakers proposing legislation to address surprise medical bills, this month’s survey also measures the public’s support for federal government action to protect patients from having to pay the cost incurred from an inadvertent out-of-network provider.

Poll: Most Americans Say HIV Is Serious Issue for the Country as Trump Administration Rolls Out New Plan to End HIV by 2030; Black and Hispanic Adults Report More Personal Concern than White Adults

Support for Medicare-for-all Holds Steady With the Trump administration launching a new domestic HIV effort, the latest KFF Health Tracking Poll finds a large majority of Americans (80%) view the HIV epidemic as a serious national issue, including a third (34%) who view it as “very serious.” Nearly half (46%) view…

The Health Care Priorities and Experiences of California Residents

This survey by the Kaiser Family Foundation and California Health Care Foundation gauges California residents’ views on health care priorities facing the state’s new governor and legislature, including health care affordability, access to care, mental health and substance use treatment, and provider shortages. It also highlights Californians’ experiences in the health care system, as well as views on the Affordable Care Act, Covered California, Medi-Cal, and proposals to advance a single-payer health insurance system in the state.

KFF Health Tracking Poll – January 2019: The Public On Next Steps For The ACA And Proposals To Expand Coverage

This month’s KFF Health Tracking Poll finds that about four in ten are aware of the federal judge’s ruling that the ACA is no longer valid but once made aware, most disapprove of the ruling. This poll also examines the public’s favorability toward expanding the role of public health care programs, and majorities across partisan groups have a favorable opinion of programs such as Medicare buy-in and Medicaid buy-in, with a national Medicare-for-all being less popular but still receiving a majority of support overall.

New Analysis Maps Prevalence of Pre-Existing Conditions by Metro Area

A new Kaiser Family Foundation analysis maps rates of pre-existing conditions across 129 metropolitan and micropolitan areas in the U.S., finding that even within the same state, the prevalence of such conditions can vary substantially. For example, 34 percent of residents of Florence, South Carolina have a pre-existing condition, but…

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Filling the need for trusted information on national health issues, the Kaiser Family Foundation is a nonprofit organization based in San Francisco, California.