Becoming a U.S. citizen, receiving a green card, or being granted another lawful immigration status changes which health coverage you can buy and which government programs you can join. The Marketplace treats this change as a qualifying life event, because before that date you could not enroll at all, or you could enroll only under narrower rules. Naturalization at an oath ceremony, approval of Form I-485 for lawful permanent residence, and a grant of refugee or asylee status all start a 60-day Special Enrollment Period (SEP) at healthcare.gov or through your state-based exchange such as Covered California, MNsure, or kynect. Coverage that you select during the SEP generally starts the first day of the month after you choose a plan, so the earlier you act, the shorter any gap. The rules in 2026 are also shifting under the 2025 reconciliation law, which narrows Medicaid eligibility for many lawfully present immigrants on October 1, 2026 and Marketplace subsidies on January 1, 2027. This page explains the 60-day window with anchored dates, the Medicaid pivot, the documents to gather, and the state programs that fill gaps during the federal 5-year wait.
Naturalized citizens and green card holders follow different paths after the SEP opens. A naturalized citizen is treated like any other citizen: Medicaid and CHIP are open year-round with no 5-year bar, and Marketplace subsidies follow ordinary income rules. A green card holder can claim premium tax credits in 2026 at or above 100% of the Federal Poverty Level, but Medicaid eligibility usually waits five years from the date of lawful permanent residence, with exceptions for veterans, active-duty service members, and people with 40 quarters of work history. Children and pregnant people in many states skip the wait under the Immigrant Children's Health Improvement Act option. Applying is done through a single application at healthcare.gov, which routes eligible households to Medicaid or CHIP automatically. Compare Medicaid, subsidized Marketplace plans, employer coverage, and state-funded programs before the 60 days end, and use the Medicaid income limits and ACA income limits pages on this site to check your household size against the 2026 thresholds.
7 Steps to Get Coverage
Common Mistakes That Cost People Thousands
Five mistakes cost new citizens and green card holders coverage or subsidy dollars in 2026.
- Counting the 60 days from the application date instead of the effective date on your naturalization certificate or green card.
- Skipping Medicaid because you assume a green card always triggers the 5-year bar, when veterans, active-duty families, refugee-based cases, and children or pregnant people in many states are exempt.
- Reporting last year's income instead of projected 2026 income, which changes the premium tax credit and can trigger repayment through Form 8962.
- Ignoring the data-matching notice from the Marketplace, which can end coverage and subsidy if the immigration document is not uploaded by the printed deadline.
- Assuming rules will stay the same in 2027, when refugees, asylees, and several other lawfully present groups lose premium tax credit eligibility on January 1, 2027 unless they become green card holders or citizens.
Medicaid and CHIP After Gaining Status in 2026
Naturalized citizens qualify for Medicaid and CHIP the same way any other citizen does, with no waiting period. Medicaid in the 40 expansion states plus DC covers adults up to 138% of the Federal Poverty Level, which is $22,025 for one person and $45,540 for a family of four in 2026. State programs carry different names: Medi-Cal in California, AHCCCS in Arizona, BadgerCare in Wisconsin, MassHealth in Massachusetts, HUSKY Health in Connecticut, and NJ FamilyCare in New Jersey. Apply through healthcare.gov or your state agency at any time of year, because Medicaid and CHIP have no enrollment deadline and the 60-day SEP applies only to Marketplace plans.
Green card holders face the federal 5-year bar created by the 1996 welfare law (PRWORA), which delays Medicaid and CHIP for five years from the date of lawful permanent residence. Exemptions cover veterans, active-duty service members and their families, and people with 40 quarters of work history. Lawfully residing children and pregnant people skip the wait in states that adopted the Immigrant Children's Health Improvement Act option. Starting October 1, 2026, the 2025 reconciliation law limits Medicaid and CHIP for most lawfully present adults to green card holders, Cuban and Haitian entrants, and people residing under the Compacts of Free Association, so refugees and asylees who do not hold a green card lose federal Medicaid eligibility on that date. Check your state agency for the exact rule that applies to your case.
Marketplace Subsidy Rules for 2026 and 2027
Premium tax credits in 2026 are available to citizens and lawfully present immigrants with household income between 100% and 400% of the Federal Poverty Level, which is $15,960 to $63,840 for one person and $33,000 to $132,000 for a family of four in 2026. The enhanced credits from the American Rescue Plan and Inflation Reduction Act expired on January 1, 2026, so the 400% FPL subsidy cliff is back. Lawfully present immigrants below 100% FPL who are ineligible for Medicaid because of their status lost premium tax credit access on January 1, 2026. Enrollees who report income in this range should compare Bronze, Silver, and Gold plans at healthcare.gov, and cost-sharing reductions on Silver plans apply only for income up to 250% FPL.
Beginning January 1, 2027, the 2025 reconciliation law restricts premium tax credits to citizens, green card holders, Cuban and Haitian entrants, and people residing under the Compacts of Free Association. Refugees, asylees, survivors of trafficking, and holders of temporary statuses lose credit eligibility that year unless they obtain lawful permanent residence or citizenship. KFF analysis of the law shows that a green card or naturalization before 2027 therefore protects subsidy access for the 2027 plan year. Enroll during the 60-day SEP or the 2027 Open Enrollment window from November 1, 2026 through January 15, 2027, and confirm the current rule at healthcare.gov before you choose a plan.
Documents You Need and Why Each One Matters in 2026
Proof of your new status is the document that unlocks the SEP, because the Marketplace checks your immigration document number against Department of Homeland Security records in real time. A Certificate of Naturalization or U.S. passport proves citizenship, while a green card or Form I-797 approval notice proves lawful permanent residence. Income documents such as pay stubs, a 2026 employer letter, or a self-employment ledger let the Marketplace calculate the premium tax credit and decide whether Medicaid applies. Social Security numbers for everyone on the application speed verification, and an ITIN works for tax household members who are not applying. Uploading these files at the start prevents the data-matching notices that end coverage when a deadline passes.
Frequently Asked Questions
What is the SEP window for gaining U.S. citizenship or lawful status?
The Marketplace Special Enrollment Period lasts 60 days from the date your citizenship or lawful presence takes effect. If you take the naturalization oath on October 15, 2026, your window runs from October 15 through December 14, 2026. Enroll at healthcare.gov or through your state exchange before Day 60 ends. Coverage selected in the SEP generally starts on the first day of the month after you pick a plan. Medicaid and CHIP have no deadline and stay open all year, so you can apply for those programs at any time. The 2027 Open Enrollment period, November 1, 2026 through January 15, 2027, also overlaps with this window for anyone approved in the fall of 2026.
How do I document my new status for the SEP application?
Enter your immigration document number on the healthcare.gov application, and keep a copy of your Certificate of Naturalization (Form N-550), green card (Form I-551), or USCIS approval notice (Form I-797) ready to upload. The Marketplace checks the number against Department of Homeland Security records, and most applicants clear verification instantly. If the system flags an inconsistency, you receive a data-matching notice with a deadline, and you upload the document to keep coverage and subsidy active. Add pay stubs or an employer letter to support your projected 2026 income, and add a DD-214 if you claim a veteran exemption from the 5-year Medicaid wait.
What if I miss the 60-day SEP window after gaining status?
Missing the 60-day window means you generally wait for ACA Open Enrollment, which runs November 1, 2026 through January 15, 2027 for 2027 coverage, and you go without Marketplace coverage in the meantime. Medicaid and CHIP remain open all year, so a qualifying household can still apply for them at any time. Another qualifying life event, such as marriage, a birth, or a new employer plan, can open a fresh SEP. Some people qualify for an exception when a Marketplace error, a delayed document, or an agency delay caused the miss, and you can request one through the Marketplace Call Center at 1-800-318-2596.
Can I get retroactive coverage after gaining citizenship or a green card?
Marketplace plans selected during the SEP generally start on the first day of the month after plan selection, and they are not retroactive to your naturalization or green card date. Medicaid works differently: many states provide up to three months of retroactive coverage before your application month if you were eligible then, though the 2025 reconciliation law shortens that lookback to one month for expansion adults and two months for others starting in 2027. Emergency Medicaid can pay for an emergency medical event regardless of status. Apply quickly, because a fast application shortens any coverage gap.
What state-specific rules apply after gaining lawful status?
State rules change who covers green card holders inside the 5-year federal Medicaid wait. California's Medi-Cal and New York Medicaid use state funds to cover many income-eligible immigrants during the wait, and Illinois AllKids covers children regardless of status. Ten non-expansion states (Alabama, Florida, Georgia, Kansas, Mississippi, South Carolina, Tennessee, Texas, Wisconsin, and Wyoming) offer no adult expansion, so Marketplace plans are the main route. State-based exchanges such as Covered California, MNsure, and kynect run their own SEP portals. Check your state Medicaid agency for the current 2026 rules.
Do I qualify for Medicaid after becoming a citizen or green card holder?
Naturalized citizens qualify for Medicaid the same as other citizens: adults with income up to 138% FPL in a 2026 expansion state, which is $22,025 for one person or $45,540 for a family of four. Green card holders usually wait five years from their lawful permanent resident date, unless they are veterans, active-duty service members, have 40 quarters of work history, or live in a state that waives the wait for children and pregnant people. Use the household-size table on this page to compare your income, and apply at healthcare.gov, which screens for Medicaid and the Marketplace at once.
What happens to my children's coverage after I gain status?
Children who are U.S. citizens qualify for Medicaid and CHIP on their own income and are not affected by a parent's status, so a parent's naturalization does not change eligibility. Lawfully residing children in most states can join CHIP or Medicaid without the 5-year wait through the Immigrant Children's Health Improvement Act option, and Illinois AllKids and California Medi-Cal cover children more broadly. Household size on the Marketplace application includes all family members who file taxes together, so add every child to the application and compare the CHIP result with the family subsidy.
How do the 2027 immigrant subsidy changes affect my plan?
Starting January 1, 2027, the 2025 reconciliation law limits Marketplace premium tax credits to citizens, green card holders, Cuban and Haitian entrants, and people residing under the Compacts of Free Association. Refugees, asylees, and survivors of trafficking who do not hold a green card lose credit eligibility that year. Medicaid and CHIP for most other lawfully present adults narrows on October 1, 2026. If you hold green card or citizenship status, your subsidy path is protected. If you have a temporary status, ask an immigration attorney whether adjustment to permanent residence is available.
