If you carry private health insurance, your child can stay on Medicaid for as long as they continue to meet the program’s eligibility rules — income, age, and state residency — because private coverage is not a disqualifier. In most states that means birth through age 18, with the two plans working side by side: your private insurance pays first on each claim, and Medicaid picks up what’s left.1eCFR. 42 CFR Part 433 Subpart D – Third Party Liability
Private Insurance Doesn’t End Medicaid Eligibility
Medicaid eligibility for children looks at household income, the child’s age, citizenship or immigration status, and where you live. It does not look at whether you also have an employer plan or an individual policy. The financial test uses Modified Adjusted Gross Income (MAGI), which counts taxable income and tax filing relationships but includes no asset test, so savings, home equity, and retirement accounts don’t factor in.2Medicaid.gov. Eligibility Policy
State Medicaid agencies routinely enroll children who already carry private coverage. Dual coverage is common and expected — the program is built around the assumption that some enrolled children have other insurance, and federal rules govern how the two work together.
The Income Threshold You Actually Have to Watch
Each state sets its children’s Medicaid income limit as a percentage of the federal poverty level. For 2026, the FPL is $27,320 for a family of three and $33,000 for a family of four.3U.S. Department of Health and Human Services. 2026 Poverty Guidelines Most states set the children’s cutoff at 133% of FPL or higher, and when you add the Children’s Health Insurance Program (CHIP), which uses Medicaid-style rules at higher income levels, state upper limits range from about 170% to 400% of FPL.4Medicaid.gov. Medicaid, Children’s Health Insurance Program, and Basic Health Program Eligibility Levels In real dollars, a family of four earning 200% of the 2026 FPL makes roughly $66,000; at 300%, about $99,000. In the most generous states, a family of four earning over $130,000 could still have children eligible for CHIP.
How Medicaid Coordinates With Your Private Plan
Federal rules make Medicaid the payer of last resort. When your child sees a doctor, the provider bills your private insurance first. Once the private plan pays or issues a substantive denial, the remaining balance goes to Medicaid, which covers allowable costs including copays, deductibles, and services the private plan doesn’t include.5Medicaid.gov. Coordination of Benefits and Third Party Liability Handbook This is why your state agency asks about other insurance at enrollment and at every renewal.
Reporting your private plan is required, and it’s how the system is supposed to work. If Medicaid ends up paying for something your private insurer should have covered, the state must seek reimbursement from the private insurer within 60 days of learning about the coverage.1eCFR. 42 CFR Part 433 Subpart D – Third Party Liability Honest oversights, like forgetting to update your file after switching jobs, get resolved through that recovery process. Concealing coverage to steer claims to Medicaid is treated as benefit fraud.
Two practical notes. First, confirm that your child’s pediatrician, specialists, and hospital all accept both plans. Pediatric practices and children’s hospitals handle dual billing routinely; smaller specialty offices sometimes don’t. Second, Medicaid’s benefit package for children — Early and Periodic Screening, Diagnostic, and Treatment (EPSDT) — covers vision exams and glasses, dental care, hearing aids, mental health services, medical transportation, and therapies that many private plans limit or exclude. That’s where dual coverage stops being paperwork and starts being valuable.
Twelve Months at a Time
Since January 1, 2024, every state must give children under 19 a full 12 months of continuous Medicaid or CHIP eligibility.6Medicaid.gov. Continuous Eligibility for Medicaid and CHIP Coverage Once your child is determined eligible, that determination holds for the full year even if your income rises above the threshold mid-year or your family circumstances change. Before this federal rule, only about half of states offered full 12-month protection, and some limited it to certain ages.7Office of the Assistant Secretary for Planning and Evaluation. New Federal 12-Month Continuous Eligibility Expansion A raise, a bonus, or a spouse starting a new job won’t push your child off the rolls before the year is up.
What Happens at Renewal
At the 12-month mark, the state reviews eligibility. Agencies must first try to renew coverage automatically using data they already have from tax records and other benefit programs. If those checks confirm eligibility, coverage renews without any action from you. When automatic renewal isn’t possible, you’ll get a packet asking for updated income and residency documentation.6Medicaid.gov. Continuous Eligibility for Medicaid and CHIP Coverage
This is where families most often lose coverage — not because the child stopped qualifying, but because the renewal form got buried or the deadline passed. If you miss it, the state must give at least 10 days’ notice before terminating coverage.8eCFR. 42 CFR 431.211 – Advance Notice Many states also allow you to complete a late renewal within 90 days and restore coverage without filing a new application. Put the renewal date on your calendar.
The Age Ceiling
In most states, children’s Medicaid runs from birth through age 18, and coverage ends the month your child turns 19.9InsureKidsNow.gov. Frequently Asked Questions A handful of jurisdictions extend eligibility to 19- and 20-year-olds at varying income levels.4Medicaid.gov. Medicaid, Children’s Health Insurance Program, and Basic Health Program Eligibility Levels
Before terminating coverage at 19, the state should screen your child for adult Medicaid categories, which use different rules than the children’s program. That screening often begins 60 to 90 days before the birthday and sometimes requires additional information from you. The process varies by state and does occasionally fall through the cracks, so if the 19th birthday is coming up and you haven’t heard anything, call your state agency.
What Can Actually End Coverage Before 19
Three things end a child’s Medicaid before they age out:
- Income above the state’s limit at the 12-month renewal.
- Moving out of state. Medicaid does not follow you across state lines; you’ll need to reapply where you land, and there can be a processing gap.
- Missed renewal paperwork.
Having private insurance is not on that list. Getting a raise mid-year is not on it either, because of the 12-month continuous eligibility rule. What matters is your income at the renewal point and your ability to return the paperwork on time.
If Coverage Does End
Losing Medicaid or CHIP qualifies your child for a Special Enrollment Period on the Health Insurance Marketplace. You have 90 days from the date coverage ends to pick a Marketplace plan, and you don’t have to wait for open enrollment.10HealthCare.gov. Getting Health Coverage Outside Open Enrollment Depending on your household income, your child may also qualify for premium subsidies on that Marketplace coverage. If you already carry a private plan through work, losing Medicaid is also a qualifying life event to add your child to your employer plan — check with your HR office on the timeline.
For a child aging out at 19, start looking a few months before the birthday. If adult Medicaid doesn’t cover your child in your state, the Marketplace SEP is the backup, and planning early avoids a gap between the last day of children’s Medicaid and the first day of the next plan.