This page displays an interactive map of the current status of state decisions on the Affordable Care Act’s Medicaid expansion. Additional Medicaid expansion resources are listed (with links) below the map.
More than a decade after its enactment, the future of the Affordable Care Act (ACA) remains uncertain as the U.S. Supreme Court takes up another challenge to the law’s constitutionality in California v. Texas (known as Texas v. U.S. in the lower courts). Oral argument is scheduled for Tuesday, November 10, 2020.
The ACA remains in effect while the litigation is pending. However, if all or most of the law ultimately is struck down, it will have complex and far-reaching consequences for the nation’s health care system, affecting nearly everyone in some way.
For information about ACA Marketplace Open Enrollment, including fact sheets and 300+ FAQs, visit our collection of resources on Understanding Health Insurance.
Featured Affordable Care Act Resources
This issue brief answers key questions about California v. Texas (known as Texas v. US in the lower courts), the case challenging the Affordable Care Act to be heard by the Supreme Court.
Issue Brief See More
Related Affordable Care Act Resources
- 5 Charts About Public Opinion on the Affordable Care Act and the Supreme Court
- Affordability in the ACA Marketplace Under a Proposal Like Joe Biden’s Health Plan
- Eligibility for ACA Health Coverage Following Job Loss
- Protecting People With Pre-Existing Conditions Isn’t As Easy As It Seems
- Is COVID-19 a Pre-Existing Condition? What Could Happen if the ACA is Overturned
- Mental Illnesses May Soon Be the Most Common Pre-Existing Conditions
- Pre-Existing Condition Prevalence for Individuals and Families
- Eliminating the ACA: What Could It Mean for Medicaid Expansion?
- Loss of the Affordable Care Act Would Widen Racial Disparities in Health Coverage
- Loss of the ACA Could Greatly Erode Health Coverage and Benefits for Women
- The Effects of Medicaid Expansion under the ACA: Studies from January 2014 to January 2020
- FAQs: Health Insurance Marketplace and the ACA
- Status of State Medicaid Expansion Decisions: Interactive Map
- Preventive Services Tracker
- Tracking Section 1332 State Innovation Waivers
The Supreme Court will review the constitutionality of the Affordable Care Act (ACA) this November in California v. Texas. This fact sheet summarizes the major provisions of the ACA, illustrating the breadth of its changes to the health care system. If all of most of the ACA is struck down, many of these provisions could be eliminated.
Issue Brief See More
- view as grid
- view as list
On June 23, 2021, a circuit court decision in Missouri put the state’s expansion of Medicaid under the Affordable Care Act (ACA) in limbo. This decision, if upheld, has implications for coverage in the state as well as the availability of federal financing to cover the cost.
This issue brief describes key characteristics of SSI enrollees, explains the SSI eligibility criteria and eligibility determination process, and considers the implications of changes in the SSI program for Medicaid, including the effects of the COVID-19 pandemic and resulting economic downturn as well as proposals supported by President Biden that Congress might consider.
Recent and Anticipated Actions to Reverse Trump Administration Section 1557 Non-Discrimination Rules
The Biden Administration has started taking steps to reverse Trump Administration policy and regulations that significantly narrowed the implementation and administrative enforcement of Section 1557, the Affordable Care Act’s nondiscrimination provision, particularly as the regulations apply to gender identity and sexual orientation. In addition, several lawsuits challenging the regulations, which…
This interactive chart allows users to track public opinion on the Affordable Care Act, from the inception of the law to the present, for subgroups based on age, race, income, gender, party identification and insurance status.
The latest KFF Health Tracking Poll explores the public’s views on the U.S. role in distributing COVID vaccines to other countries, health care priorities for Congress, prescription drug regulations and price negotiations, and affordability changes in the COVID-19 relief bill.
A Closer Look at the Uninsured Marketplace Eligible Population Following the American Rescue Plan Act
This analysis examine key demographic characteristics of the uninsured population eligible for subsidies to buy Marketplace coverage following the American Rescue Plan.
The Affordable Care Act (ACA) requires new private health insurance plans to cover many recommended preventive services without any patient cost-sharing. This tracker presents up-to-date information on the adult preventive services nongrandfathered private plans must cover, by condition, including a summary of the recommendation, the target population, the effective date of coverage, and related federal coverage clarifications.
New Analysis Summarizes Recent Research on the Effects of ACA Medicaid Expansion, Providing Context for Renewed Expansion Debates in States
New federal financial incentives for Medicaid expansion and the increased reliance on Medicaid as a coverage safety net during the pandemic have renewed debate in the 12 states that have not adopted the Medicaid expansion under the Affordable Care Act. A new KFF literature review provides context for these expansion…
Building on the Evidence Base: Studies on the Effects of Medicaid Expansion, February 2020 to March 2021
This report summarizes evidence from nearly 200 studies on the effects of Medicaid expansion published between February 2020 and March 2021. These studies generally find beneficial impacts of expansion across a range of areas.