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

Explaining California v. Texas: A Guide to the Case Challenging the ACA
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.
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- 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
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- 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: Updated Findings from a Literature Review
- FAQs: Health Insurance Marketplace and the ACA
- Status of State Medicaid Expansion Decisions: Interactive Map
- Preventive Services Tracker
- Tracking Section 1332 State Innovation Waivers

Potential Impact of California v. Texas Decision on Key Provisions of the Affordable Care Act
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.
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What Paul Ryan’s Stance on 2016 Means for Health Care
In this column for The Wall Street Journal’s Think Tank, Drew Altman discusses the implications of Paul Ryan’s decision to rule out being drafted as a Republican presidential candidate for the 2017 health care agenda and how it could focus greater attention on proposals to change Medicare and Medicaid along with the Affordable Care Act.
Perspective Read MoreHealth and the 2016 Election: Implications for Women
The leading US presidential candidates and their parties’ platforms offer distinct and often opposing policy proposals on issues that affect women’s health. In the Women’s Health Issues journal, the Kaiser Family Foundation’s Caroline Rosenzweig, Usha Ranji, and Alina Salganicoff present their analysis of the differences between the Democratic and Republican parties on range of women’s health policy issues – including the Affordable Care Act, reproductive health, older women’s health, and violence prevention.
Perspective Read MoreOverview of Medicaid Per Capita Cap Proposals
The House Republican Plan (“A Better Way”) released on June 22, 2016, includes a proposal to convert federal Medicaid financing from an open-ended entitlement to a per capita allotment or a block grant (based on a state choice). This proposal is part of a larger package designed to replace the Affordable Care Act (ACA) and reduce federal spending for health care. Often tied to deficit reduction, proposals to convert Medicaid’s financing structure to a per capita cap or block grant have been proposed before. Such changes represent a fundamental change in the financing structure of the program with major implications for beneficiaries, providers, states and localities. Key things to understand about a per capita cap include the following: how a per capita cap works, key design challenges, and implications of a per capita cap.
Issue Brief Read MoreTwo Year Trends in Medicaid and CHIP Enrollment Data: Findings from the CMS Performance Indicator Project
This brief provides an overview of recent trends in Medicaid and CHIP enrollment as of January 2016, based on data from the Centers for Medicare and Medicaid Services (CMS) produced as part of its Performance Indicator Project. The project was designed to provide timely data on Medicaid and CHIP eligibility and enrollment that are intended to help strengthen data-driven program management and oversight efforts at both the national and state level. They also provide insight into Medicaid and CHIP eligibility and enrollment experiences as the ACA is implemented. This brief examines data as of January 2016 to be able to look at two full years of data post implementation of the major coverage provisions in the Affordable Care Act (ACA).
Issue Brief Read MoreKaiser Health Tracking Poll: June 2016
The June Kaiser Health Tracking Poll examines attitudes on the Affordable Care Act and provides an in-depth analysis of two of the biggest health policy stories of the month: the Zika virus outbreak and reports about the rising costs of ACA health insurance premiums.
Poll Finding Read MoreSurvey of Non-Group Health Insurance Enrollees, Wave 3
The survey, conducted shortly after the close of the Affordable Care Act’s third open enrollment period, is the third in a series exploring the experiences of individuals who purchase their own health insurance in the nongroup market, including coverage purchased both inside and outside the ACA’s marketplaces. It examines enrollees’ satisfaction with their health plans’ premiums, deductibles, and provider networks, their views on affordability, shopping experiences, and problems encountered with their plans.
Poll Finding Read More2016 Survey of Health Insurance Marketplace Assister Programs and Brokers
In its third year, the survey tracks the experiences of assistance programs signing people up for Affordable Care Act coverage during open enrollment and, for consumers who qualify, during special enrollment periods. This year, for the second time, the survey includes health insurance brokers who helped people apply for non-group coverage in an ACA marketplace.
Report Read MoreUnderstanding Medicaid Hospital Payments and the Impact of Recent Policy Changes
Medicaid payments to hospitals, which include base and supplemental payments, play an important role in hospital finances and can affect beneficiaries’ access to care.This brief provides an overview of Medicaid payments for hospitals and explores the implications of the ACA Medicaid expansion, including changes in uncompensated care, as well as payment policy changes on hospital finances.
Issue Brief Read MoreJAMA Forum: The Partisan Divide on Health Care
In this post for JAMA, the Kaiser Family Foundation’s Larry Levitt outlines the health care platforms of the Republican and Democratic parties, noting their fundamentally different aims and differing ideas about, among other things, the Affordable Care Act (also known as Obamacare) and Medicare.
Perspective Read MoreHow ACA Marketplace Premiums Measure Up to Expectations
Premium increases in the health insurance marketplaces created under the Affordable Care Act (ACA) will likely be higher in 2017 than in recent years; however, the actual average benchmark premium in the ACA marketplaces in 2016 is below what the Congressional Budget Office projected for 2016 before the health law was passed. How actual marketplace premiums compare to what CBO expected in doing those budget projections is an important factor in determining whether the ACA continues to be on track to reducing the deficit.
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