If you're a Medicare beneficiary, you might wonder why a story about Medicaid expansion belongs in your reading. Here's why it matters: millions of Americans — including the adult children, grandchildren, and spouses of Medicare enrollees — are caught in a broken coverage system that leaves them completely uninsured. And sweeping new federal legislation passed in 2025 is about to make that situation significantly worse. Understanding the coverage gap also helps explain why Medicare Advantage and Medicaid dual-eligibility programs exist, who qualifies for them, and what the broader safety net looks like for lower-income Americans of all ages.

The coverage gap is a specific, technical term that describes a cruel arithmetic problem in American health insurance. In states that have not expanded Medicaid under the Affordable Care Act, adults must have incomes below a very low threshold — often well under 50% of the federal poverty level — to qualify for Medicaid at all. At the same time, ACA Marketplace premium tax credits only kick in for people earning at or above 100% of the federal poverty level. That leaves a band of people in the middle: earning too much for Medicaid in their state, but too little to access subsidized Marketplace coverage. In 2026, 100% of the federal poverty level equals roughly $15,060 per year for a single adult. Someone earning $12,000 a year — working part-time, doing seasonal labor, or piecing together gig work — falls squarely in that gap with zero affordable options.

As of mid-2026, 41 states plus the District of Columbia have adopted the Medicaid expansion. That means in those states, any adult earning up to 138% of the federal poverty level — about $20,783 per year for a single person — qualifies for Medicaid. The 10 states that have not expanded are Alabama, Florida, Georgia, Kansas, Mississippi, South Carolina, Tennessee, Texas, Wisconsin, and Wyoming. (Georgia and Wisconsin have partial expansion programs through waivers, but they do not cover the full expansion population.) According to KFF analysis using 2024 data, approximately 1.2 million uninsured adults are currently stuck in the coverage gap across those non-expansion states. That number has declined significantly over the years as more states adopted expansion, but it is now expected to plateau — or grow — because the political and financial landscape has fundamentally shifted.

Who are these 1.2 million people? They are not, as political rhetoric sometimes suggests, people who simply choose not to work. The data consistently shows that the majority of adults in the coverage gap are either working themselves or live in a household where someone works. They are disproportionately people of color, particularly Black and Latino adults in Southern states. Most do not have dependent children at home, which matters because traditional Medicaid in non-expansion states has historically been structured around covering parents with children, pregnant women, people with disabilities, and the elderly — not working-age adults without kids. A 40-year-old man working 30 hours a week at a warehouse in Mississippi, earning $11,000 a year, has essentially no affordable path to health insurance under the current system in his state.

For years, federal policy tried to nudge non-expansion states toward adopting the expansion by offering financial sweeteners. The American Rescue Plan Act of 2021 included a provision that gave any newly expanding state an additional 5 percentage point increase in their federal Medicaid matching rate for two years — a significant financial incentive worth hundreds of millions of dollars to a state like Texas or Florida. That carrot helped bring several states over the finish line. But the 2025 federal reconciliation law — a sweeping budget and tax package passed by Congress — eliminated that incentive entirely. Not only that, but the new law actually imposes financial penalties on states that have already expanded Medicaid, by reducing their federal matching funds in certain circumstances. The message to non-expansion states is now effectively: there's no reward for expanding, and the states that did expand are being penalized. The practical result is that the 1.2 million people in the coverage gap are likely to remain there indefinitely.

The 2025 reconciliation law introduces another major change that will affect millions more people, even if it doesn't technically expand the coverage gap: mandatory Medicaid work requirements. Starting in January 2027 — or earlier if a state chooses — all states that have adopted the Medicaid expansion will be required to condition eligibility for expansion adults on meeting work requirements. This means adults covered through the expansion will need to document that they are working, in school, volunteering, or otherwise meeting an activity threshold to keep their Medicaid coverage. Georgia and Tennessee, which have existing waiver programs, are also included. The Congressional Budget Office, the nonpartisan federal agency that scores legislation, estimates that these work requirements will cause 5.3 million people to lose Medicaid coverage over the next 10 years. Most of those losses are expected to come not from people who are actually unemployed, but from people who are working and simply fail to navigate the paperwork and reporting requirements — a well-documented phenomenon from prior work requirement experiments in states like Arkansas.

Here is a critical distinction that matters for understanding the numbers: people who lose Medicaid because they fail to meet or report work requirements do not technically fall into the coverage gap. They remain income-eligible for Medicaid — they just lose the coverage because of an administrative or compliance failure. That means the official coverage gap count of 1.2 million will not automatically rise as work requirements take effect. But the practical reality is that millions more Americans will become uninsured, even if they don't fit the technical definition of the coverage gap. The total uninsured population in the United States is expected to rise substantially between 2026 and 2030 due to the combination of work requirements, the expiration of enhanced Marketplace premium tax credits, and other policy changes in the reconciliation law.

The enhanced Marketplace premium tax credits, first enacted in the American Rescue Plan Act and extended through 2025, made ACA Marketplace plans significantly more affordable for people earning between 100% and 400% of the federal poverty level — and eliminated premiums entirely for many lower-income enrollees. Those enhanced credits are set to expire at the end of 2025 under current law. Without them, millions of people who currently pay little or nothing for Marketplace coverage will face premium increases of hundreds of dollars per month. Some will drop coverage entirely. This is a separate problem from the coverage gap, but it compounds the overall coverage crisis that is unfolding in real time.

Data Snapshot: According to CMS.gov data, as of early 2024, Medicaid and CHIP covered approximately 94 million people nationwide — a historic high reached during the COVID-era continuous enrollment period. Following the end of that period and the subsequent Medicaid unwinding process, enrollment declined significantly, with CMS reporting that more than 20 million people were disenrolled from Medicaid between April 2023 and late 2024. Many of those disenrollments were procedural — people who remained eligible but lost coverage due to paperwork issues — mirroring exactly the dynamic that work requirements are expected to replicate on a larger scale starting in 2027. CMS.gov also reports that in 2024, there were more than 7,400 Medicare Advantage plans available nationwide, reflecting the parallel growth of the private Medicare market even as the Medicaid safety net faces significant contraction.

For Medicare beneficiaries specifically, the most direct connection to this issue is through dual eligibility — the status of being enrolled in both Medicare and Medicaid simultaneously. Roughly 12 million Americans are dually eligible, and they represent some of the most vulnerable people in the healthcare system: low-income seniors and people with disabilities who rely on Medicaid to cover Medicare's premiums, deductibles, and cost-sharing. Medicaid also covers long-term care services — nursing home care, home health aides, personal care — that Medicare does not cover. If Medicaid enrollment shrinks due to work requirements or other policy changes, some dual-eligible beneficiaries could lose the Medicaid wrap-around coverage that makes their Medicare benefits actually affordable. Medicare Savings Programs, which help low-income Medicare beneficiaries pay their Part B premium (currently $185 per month in 2025), are administered through Medicaid. Any disruption to Medicaid eligibility systems could affect those programs as well.

If you or a family member lives in one of the 10 non-expansion states and earns between roughly $9,000 and $15,000 per year as a single adult, the coverage gap is a real and immediate problem. There is currently no federal program that fills it. Some community health centers offer sliding-scale care regardless of insurance status, and federally qualified health centers (FQHCs) are required to serve patients regardless of ability to pay. The Health Resources and Services Administration (HRSA) maintains a searchable directory of FQHCs at findahealthcenter.hrsa.gov. For people who are close to the 100% federal poverty level threshold, it is worth carefully calculating annual income, because even a small difference can mean the difference between qualifying for Marketplace subsidies or falling into the gap. A licensed insurance broker or a navigator certified through your state's Marketplace can help you run those numbers — at no cost to you.

For Medicare beneficiaries who are helping adult children or other family members navigate coverage, the most important action right now is to check whether your state has expanded Medicaid at medicaid.gov/medicaid/eligibility, and to apply for Marketplace coverage during the Open Enrollment Period (November 1 through January 15 in most states) if income is above the poverty line. If you are a Medicare beneficiary yourself and concerned about your own Medicaid eligibility for Medicare Savings Programs or long-term care, contact your State Health Insurance Assistance Program (SHIP) counselor — a free, unbiased resource available in every state through shiphelp.org. The coverage landscape is shifting rapidly, and staying informed is the most powerful tool available.