Medicaid Expansion: Who Qualifies at 138 Percent of the Poverty Line — and Who Falls in the Gap

Medicaid expansion is the Affordable Care Act provision that extended Medicaid to most adults with household income up to 138 percent of the federal poverty line — about 21,000 dollars a year for a single person and roughly 36,000 for a family of three under 2026 guidelines — in states that adopted it. After the Supreme Court made expansion optional in 2012, adoption split by state. As of early 2026, 40 states and the District of Columbia had expanded, per KFF's tracking of state adoption, leaving roughly 1.5 million adults in the coverage gap in the remaining states: too poor for marketplace subsidies, ineligible for their state's Medicaid.

This site publishes information, not medical or insurance advice. Eligibility rules, income limits and redetermination procedures vary by state and change with federal guidance; verify your situation with your state Medicaid agency or through HealthCare.gov before acting on anything here.

Who expansion actually covers

Expansion eligibility is based on modified adjusted gross income relative to the current poverty line, and unlike legacy Medicaid there is no requirement to be a parent, pregnant, disabled or elderly — a childless adult working full-time at minimum wage qualifies in expansion states if income stays under the line. Federal law sets a mandatory minimum of 133 percent of poverty plus the standard five-percent income disregard, which is why the effective line is quoted as 138 percent. States may — and many do — go further: some set higher income limits, and every state covers children at multiples of the poverty line through CHIP.

Eligibility is determined month by month, not just at enrollment. A person who qualifies in March but earns over the line in April is technically eligible for March only, which is why timely reporting of income changes matters so much in expansion populations with variable hours.

The coverage gap and what holdout states look like

In non-expansion states, Medicaid for non-disabled adults is largely limited to very low-income parents — in some states below 30 percent of poverty — and to pregnancy or disability pathways. Marketplace subsidies legally begin at 138 percent of poverty precisely because the law assumed expansion everywhere. The result is the gap: a Texas warehouse worker earning 20,000 dollars a year has no subsidized option at all. The gap's size has made it a recurring item in state legislation; several holdout states have debated ballot initiatives or federal arrangements over the past decade, with expansion adopted in a handful of states by referendum.

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Redeterminations: how people lose coverage they still qualify for

After the pandemic-era continuous enrollment requirement ended, states resumed eligibility redeterminations, and the resumption became the largest coverage churn event in program history — tens of millions of renewals processed, with a majority of coverage losses attributed to paperwork problems rather than ineligibility, per KFF's tracking of state data. The mechanics matter: renewal packets are mailed to the address on file, responses have deadlines often around 30 days, and silence equals closure. If you move, update your address the week you move. If you receive a renewal packet, return it early. Lost coverage for procedural reasons can be reinstated within a retrial window — commonly 90 days — if you act quickly.

Pregnancy and disability pathways interact with expansion in ways worth knowing. Pregnancy-related Medicaid in nearly every state extends well above 138 percent — often to 200 percent or beyond — and postpartum coverage has been extended to a full twelve months in most states under a federal option adopted widely since 2022. For people with disabilities, SSI-linked eligibility runs parallel to expansion and uses different financial tests, including asset rules that expansion adults largely escaped. A single household can have members on different pathways at once: one adult on expansion, a child on CHIP, a grandparent on Medicare and Medicaid together.

What expansion coverage includes

• Full benefit scope: expansions must cover the ACA essential health benefits, including hospital, physician, prescription drugs, mental health and substance-use treatment.
• Minimal cost sharing: nominal copays only, capped by federal rules, with no premiums for most expansion adults in most states.
• retroactive coverage: in many states, Medicaid can pay eligible medical bills from up to three months before application — critical for people who enroll only after a hospitalization.

How to check and apply

Application routes converge on one record: your state Medicaid agency processes applications taken online at HealthCare.gov, by phone, or in person at county offices, and a single application screens for Medicaid, CHIP and marketplace subsidies simultaneously. Have ready proof of income for the current month, residency, and identity for each applicant. If you are denied, the denial letter states the reason and your fair-hearing right — an administrative appeal with a hearing officer that frequently reverses procedural denials.

One more practical point concerns which income counts. Eligibility uses modified adjusted gross income from your tax return or current-month pay stubs, not gross wages before deductions; the five-percent disregard then knocks the top off income near the line. Self-employed applicants document annualized expected income rather than hourly rates, and seasonal workers are assessed on the month of application with changes reported as they occur. Caseworkers can misclassify variable income at intake, so bring a written monthly budget to the appointment — it shortens disputes before they start.

What to watch

Two currents are reshaping expansion. Federal legislation enacted in 2025 introduced work and community-engagement requirements with more frequent eligibility checks for the expansion population, phasing in over 2026 and 2027, per Congressional Research Service summaries — provisions that watchdogs expect to increase paperwork-driven churn even among people meeting the requirements. Meanwhile a handful of non-expansion states continue to debate adoption. If your income sits anywhere near the line, re-check eligibility every open enrollment; the boundaries move more often than the headlines suggest.