Nothing automatic happens when a child on Medicaid turns 18. Federal rules let children keep Medicaid through the month of their 19th birthday, so the real transition is a year later than most families expect.1InsureKidsNow.gov. Frequently Asked Questions As the 19th birthday approaches, the state Medicaid agency reviews whether the young adult still qualifies under adult rules, which depend on the state, on any foster care history, and on whether a disability is involved.
When Child Medicaid Actually Ends
Child Medicaid runs until the month a child turns 19 in every state.1InsureKidsNow.gov. Frequently Asked Questions A federal rule that took effect January 1, 2024, also requires states to keep children under 19 continuously eligible for 12 months at a time, so a mid-year change in household income should not cut coverage short before that 12-month period ends.2Medicaid.gov. Continuous Eligibility for Medicaid and CHIP Coverage
Before coverage ends, the state must check whether the young adult qualifies under any adult Medicaid category. Federal regulations require the agency to first try this using information already in its system and available databases, without asking the family for anything. If it cannot confirm eligibility that way, it sends a pre-filled renewal form and gives you at least 30 days to respond.3eCFR. 42 CFR 435.916 – Periodic Renewal of Medicaid Eligibility Miss the deadline and coverage can terminate, but you still have 90 days after that to submit the form and have eligibility reconsidered without starting a new application.
Adult Medicaid Eligibility at 19
Once the child category ends, eligibility is based on the young adult’s own income, not the parents’. In states that expanded Medicaid under the Affordable Care Act, any adult under 65 with a household income at or below 138% of the federal poverty level qualifies.4HealthCare.gov. Medicaid Expansion and What It Means for You For a single person in 2026, that comes to roughly $22,025 a year.5ASPE. 2026 Poverty Guidelines More than 40 states plus the District of Columbia have adopted expansion, so a 19-year-old with little or no income usually qualifies on their own.
Expansion states use a formula called Modified Adjusted Gross Income. It counts wages, self-employment earnings, and investment income, but leaves out two things worth knowing about for young adults: scholarship money used for tuition and fees, and child support received.6Medicaid.gov. Changes to Modified Adjusted Gross Income (MAGI) A part-time job while living independently typically falls well under the income ceiling.
Non-Expansion States and the Coverage Gap
In states that have not expanded Medicaid, the picture is harder. Adults without dependent children are often locked out of Medicaid regardless of how little they earn. Marketplace premium subsidies only start at 100% of the federal poverty level, so people whose income falls below that can end up in a coverage gap: too much income for the state’s Medicaid program, too little to get subsidized Marketplace insurance.4HealthCare.gov. Medicaid Expansion and What It Means for You If you live in a non-expansion state, contact the state Medicaid office directly. Some cover parents or caretaker relatives at low income levels, and a few run partial expansions or waiver programs with limited benefits.
Former Foster Youth Keep Medicaid Until 26
A young adult who was in foster care and enrolled in Medicaid at the point of aging out of foster care has a guaranteed path to continued coverage. Every state must cover former foster care youth until age 26, with no income test.7Medicaid.gov. Mandatory Coverage Former Foster Care Children This is a mandatory eligibility group written into federal law, not a state option.8SSA. Social Security Act 1902
To qualify, the young adult must have been both in foster care and receiving Medicaid through a state when they aged out. Current income does not matter, and school or work status does not matter. Some states also extend this to young people who were in foster care in a different state, though that piece is at each state’s discretion.9Medicaid.gov. Medicaid and CHIP FAQs – Coverage of Former Foster Care Children If your state Medicaid agency does not transition coverage automatically, apply and specifically mention the foster care history.
The Disability Pathway
Young adults with disabilities can qualify through a different route. In most states, anyone who receives Supplemental Security Income automatically gets Medicaid; the SSI application doubles as the Medicaid application, and coverage starts the same month SSI does.10SSA. Medicaid Information The other states run their own application process using similar disability criteria.
Disability-based Medicaid does not follow the expansion income formula. These programs generally impose asset and resource limits, which vary by state but often sit around $2,000 for an individual. This is where families run into trouble after a child turns 18. Savings accounts, UTMA funds, and even a modest inheritance can push a young adult over the resource limit.
An ABLE account is worth knowing about. It lets individuals who became disabled before age 26 save money without losing benefits. The first $100,000 in an ABLE account is excluded from SSI’s resource limit, and Medicaid continues even if the ABLE balance pushes total resources above the SSI threshold.11SSA. Spotlight on Achieving a Better Life Experience (ABLE) Accounts Open one well before the 18th birthday if possible.
Applying for Adult Medicaid
If the state does not automatically shift a young adult to an adult category, an application is required. Apply through the state Medicaid portal, through HealthCare.gov (which routes qualifying applicants to Medicaid), by mailing a paper form, or in person at a local office.4HealthCare.gov. Medicaid Expansion and What It Means for You
Have these ready before starting: a government-issued ID or birth certificate, Social Security number, proof of income such as pay stubs or tax returns, and something showing current address. A disability application also needs medical records and documentation of the condition.
Federal rules set outer limits on how long the state can take. Standard applications must be decided within 45 days. Disability-based applications extend to 90 days.12eCFR. 42 CFR 435.912 – Timely Determination and Redetermination of Eligibility Many states move faster in practice.
Retroactive Coverage for Medical Bills
Bills from the three months before an application can often be covered too. Federal regulations require states to grant eligibility back up to three months before the month of application, as long as the person would have qualified during those months and received covered services.13eCFR. 42 CFR 435.915 – Effective Date If there was a gap between losing child Medicaid and being approved as an adult, retroactive coverage may pick up bills from that stretch.
If You Are Denied or Terminated
A denial or termination notice is not final. Every Medicaid applicant and beneficiary has the right to request a fair hearing before an impartial hearing officer. The window is up to 90 days from the date the notice is mailed.14eCFR. 42 CFR Part 431 Subpart E – Fair Hearings for Applicants and Beneficiaries
Timing is critical. For someone currently enrolled who is about to be cut off, requesting a hearing before the termination takes effect (generally within 10 days of the notice) keeps benefits running while the appeal plays out. A day late and that continued coverage is gone, which can mean months uninsured.
Other Coverage If Adult Medicaid Is Not an Option
Several alternatives are available if the young adult does not qualify.
- A parent’s health insurance plan. Under the ACA, a young adult can stay on a parent’s employer-sponsored or individual plan until age 26, even if married, not living at home, financially independent, or not in school. The plan has to cover dependents in the first place, so check with the parent’s employer or insurer.15HHS.gov. Young Adult Coverage
- A Marketplace plan with financial help. Income between 100% and 400% of the federal poverty level (or higher under current subsidy rules) can qualify for premium tax credits that cut monthly costs significantly. Losing Medicaid triggers a 90-day special enrollment period, so there’s no need to wait for open enrollment.16CMS. Special Enrollment Periods (SEP) Job Aid
- Employer-sponsored insurance. A new job with health benefits typically covers a large share of the premium, and losing Medicaid also opens a special enrollment period at work outside the normal window.
The 90-day Marketplace special enrollment period is worth flagging because it is longer than the standard 60-day window that applies to most other qualifying life events. Congress extended it for people losing Medicaid or CHIP coverage.16CMS. Special Enrollment Periods (SEP) Job Aid Do not let it close without enrolling in a new plan or confirming another source of coverage.
Keeping Adult Medicaid After Approval
Once adult Medicaid is approved, the state renews eligibility once every 12 months.3eCFR. 42 CFR 435.916 – Periodic Renewal of Medicaid Eligibility The agency first tries to verify continued eligibility through electronic data sources. If it can confirm, you get a notice describing what was used and asking you to correct anything wrong. If it cannot, a pre-filled renewal form arrives with at least 30 days to respond.
Between renewals, report major changes promptly. A jump in income, a new job, marriage, a move, or a new dependent can all affect eligibility. States set their own reporting deadlines, often 10 to 30 days after the change. Missing that window can produce an overpayment the state later tries to recover, or a sudden loss of coverage.