Five Million Americans Lost ACA Health Insurance—Here’s What That Could Mean For Public Health

Five million Americans have lost their Affordable Care Act health insurance in the past year, according to new data that experts call the largest single-year drop since the ACA's launch. The loss threatens to reverse gains in coverage rates, particularly among low-income and rural populations, and could lead to a surge in uncompensated care costs, delayed diagnoses, and worse health outcomes across the country.

New data released by the Department of Health and Human Services reveals that 5 million Americans lost health insurance through the ACA marketplace between 2025 and 2026. This represents a roughly 15% decline in total ACA enrollment, which had peaked at over 35 million. The data, analyzed by health policy researchers at the Kaiser Family Foundation, attributes the drop largely to the expiration of enhanced premium subsidies that were enacted during the pandemic, along with states' ongoing Medicaid unwinding processes.

The ACA, also known as Obamacare, was signed into law in 2010 and has provided coverage to tens of millions who were previously uninsured. Enhanced subsidies introduced under the American Rescue Plan in 2021 made plans more affordable, boosting enrollment to record highs. Those subsidies expired at the end of 2025, causing premium spikes of 10 to 30% for many enrollees. Additionally, states that expanded Medicaid during the pandemic began redetermining eligibility in 2024, leading many people to lose coverage even if they remained eligible for ACA plans.

The 5 million figure comes from a combination of sources: HHS marketplace enrollment reports, state-level data from healthcare.gov, and surveys from the Urban Institute. Dr. Lisa Patel, an internist and public health researcher at the University of California, San Francisco, told Forbes that the uninsured rate is likely to climb from 8.5% to over 10% as a result. Rural areas in the South and Midwest have been hit hardest, with states like Texas, Florida, and Georgia seeing some of the largest absolute declines. Dr. Patel warned that people losing coverage often delay care for chronic conditions, leading to preventable emergency room visits and worse long-term outcomes.

The broader implications are stark. Hospitals, especially rural ones operating on thin margins, will face a rise in uncompensated care costs as uninsured patients arrive in emergency departments. Insurers may raise premiums for remaining enrollees to offset the risk pool change. Public health experts also fear that the loss of coverage will widen existing racial and socioeconomic health disparities, as Black and Hispanic communities were disproportionately represented among ACA enrollees. "This is a preventable crisis," said Dr. Patel. "The data shows that when people have insurance, they get preventive care and manage chronic diseases. Taking that away is a public health setback."

Looking ahead, several developments will shape the trajectory. Congress is debating a potential restoration of enhanced subsidies, but partisan divisions make passage uncertain. States like New Jersey and Massachusetts are exploring their own state-level subsidies to buffer against the federal lapse. Meanwhile, open enrollment for 2027 begins in November 2026, and advocates are urging sign-up drives to recapture some of the lost enrollees. The 5 million figure could grow if more states continue Medicaid unwinding or if the economy weakens. For now, the ripple effects on hospital finances, public health metrics, and individual well-being are already being felt across America.