Yes, enrolling in health insurance after open enrollment is possible, but only through specific channels. A qualifying life event opens a Special Enrollment Period on the marketplace or your employer’s plan, and Medicaid, the Children’s Health Insurance Program, and Medicare accept applications year-round under their own rules. Without one of those paths, you generally wait until the next open enrollment cycle.
Qualifying Life Events That Reopen Enrollment
Federal regulations list specific events that trigger a Special Enrollment Period. They fall into a few categories.
Losing Coverage You Already Had
This is the most common trigger. It covers losing a job-based plan after a layoff or reduction in hours, aging off a parent’s plan, exhausting COBRA, or losing eligibility for Medicaid or CHIP. One important limit: voluntarily canceling your plan or letting it lapse for nonpayment does not count.1eCFR. 45 CFR 155.420 – Special Enrollment Periods
Household Changes
Getting married, having a baby, adopting a child, taking in a foster child, or gaining a dependent through a court order all qualify. Each event lets you enroll yourself and the new household member.1eCFR. 45 CFR 155.420 – Special Enrollment Periods
A Permanent Move
Moving to a location where your current plan isn’t available triggers a Special Enrollment Period, as long as you had health coverage for at least one day during the 60 days before the move. Temporary relocations don’t qualify, and neither does a move made specifically to access different plan options.1eCFR. 45 CFR 155.420 – Special Enrollment Periods
Other Events
Gaining U.S. citizenship or lawful immigration status makes you newly eligible to apply for marketplace coverage.2CMS. Immigrant Eligibility for Marketplace and Medicaid and CHIP Coverage Being denied Medicaid or CHIP after applying through the marketplace also opens a window to pick a private plan. Exceptional circumstances such as a federally declared disaster, an insurer’s misrepresentation of your coverage options, or a marketplace system error can qualify too, but each is reviewed case by case.
How Long You Have to Act
The clock starts on the date of the qualifying event. On the federal marketplace and most state exchanges, you generally have 60 days from that date to pick a plan.3HealthCare.gov. Special Enrollment Period (SEP) – Glossary If you lost Medicaid or CHIP, the window stretches to 90 days.4CMS. Understanding Special Enrollment Periods
Employer-sponsored plans run on a tighter schedule. Under federal HIPAA rules, your employer’s plan must give you at least 30 days after a qualifying event to request enrollment.5eCFR. 29 CFR 2590.701-6 – Special Enrollment Periods Some employers offer longer, but they aren’t required to. If yours gives only the minimum, day 31 shuts the door until the next annual enrollment or another qualifying event.
How to Apply and What to Submit
For marketplace coverage, apply through HealthCare.gov or your state’s exchange if your state runs its own.6CMS. States by Marketplace Type for Plan Year 2026 You can also apply by phone, through a licensed broker, or with a paper application. For employer-sponsored coverage, go to your HR department or benefits administrator.
During the marketplace application, you’ll report your life change, choose the event type, and enter the date it happened. Have Social Security numbers and current household income ready. You’ll attest that your information is accurate, and the marketplace cross-checks it against federal records.7HealthCare.gov. A Quick Guide to the Health Insurance Marketplace
After you select a plan, you have 30 days to send documents confirming your qualifying event. Your coverage can’t be used until the marketplace confirms eligibility and you pay your first premium.8HealthCare.gov. Send Documents to Confirm a Special Enrollment Period Common documents include a marriage certificate, a birth certificate or hospital record for a new child, or a letter from your previous insurer showing when your old coverage ended.
When Your New Coverage Starts
The default rule: coverage begins the first day of the month after you select your plan.9eCFR. 45 CFR 155.420 – Special Enrollment Periods
Birth, adoption, and foster placement work differently. Coverage for the new child can be backdated to the date of birth, adoption, or placement, so the plan covers medical costs from day one. You may also be given the option to start coverage the first of the following month instead.9eCFR. 45 CFR 155.420 – Special Enrollment Periods
For loss of coverage, acting early matters. If you choose your new plan on or before the day your old coverage ends, the new plan starts the first of the month after the loss date, keeping any gap short. Wait longer in the 60-day window and coverage starts the first of the month after you make your selection.
The COBRA Trap
COBRA creates a common and costly mistake. The event that triggers your COBRA offer also triggers a 60-day marketplace Special Enrollment Period. During those 60 days, you can elect COBRA, drop it, and move to a marketplace plan. After that window closes, options shrink.10CMS. Transitioning from Employer-Sponsored Coverage to Other Health Coverage
Once the initial 60-day window passes, you generally can’t leave COBRA for a marketplace plan unless one of these things happens:
- Your COBRA period runs out, typically after 18 months, which counts as a loss of coverage.
- Your former employer stops contributing to the COBRA premium.
- Open enrollment arrives.
- A separate qualifying event, such as marriage or a move, opens a new window.
Voluntarily dropping COBRA on your own does not create a Special Enrollment Period.10CMS. Transitioning from Employer-Sponsored Coverage to Other Health Coverage
Programs With No Enrollment Window
Medicaid and CHIP
Medicaid and the Children’s Health Insurance Program have no open enrollment at all. You can apply any time your financial situation qualifies you.11HealthCare.gov. When Can You Get Health Insurance? In most states, Medicaid covers adults with household income up to 138% of the Federal Poverty Level. For 2026, that works out to roughly $22,025 for a single person and about $45,540 for a family of four, based on the 2026 poverty guidelines.12Federal Register. Annual Update of the HHS Poverty Guidelines
CHIP covers children and pregnant individuals in families earning too much for Medicaid but not enough to comfortably buy private coverage. Income limits vary by state and are generally higher than Medicaid thresholds.
Medicare
Medicare runs on its own calendar, separate from the ACA marketplace. If you missed your initial window around your 65th birthday, a General Enrollment Period runs January 1 through March 31 each year. Coverage starts the month after you sign up, but a late enrollment penalty may apply for as long as you have Medicare.13Medicare.gov. When Does Medicare Coverage Start?
Medicare also has its own Special Enrollment Periods. If you delayed Medicare because you had employer coverage, you can enroll without penalty when that coverage ends. Moving out of your plan’s service area, leaving incarceration, losing Medicaid eligibility, and being affected by a federally declared disaster are among the other triggering events, each with its own timeframe.14Medicare.gov. Special Enrollment Periods
If Your Request Is Denied
The marketplace sometimes denies Special Enrollment Period requests, often because the event wasn’t documented properly or didn’t match a recognized category. You have 90 days from the date on your eligibility notice to file an appeal.15HealthCare.gov. How to Appeal a Marketplace Decision
You can submit the Marketplace Eligibility Appeal Request form or write a letter with your name, address, and the reason you believe the decision was wrong. Attach copies of supporting documents such as a termination letter, proof of a move, or a birth certificate. Send copies, not originals, and include your appeal number on each document once it’s assigned.16CMS. Marketplace Appeals Job Aid If you missed the 90-day deadline, explain why; extensions are possible but not guaranteed.
One cost note worth checking before you shop: the enhanced premium tax credits expanded under the Inflation Reduction Act expired at the end of 2025, and as of early 2026 Congress has not enacted a renewal. If these are not extended, marketplace premiums may run noticeably higher than in prior years. Check HealthCare.gov or your state exchange for current subsidy estimates when you apply.