Special Enrollment Periods for Health Insurance

1Why this matters

Health insurance problems rarely arrive in November. A layoff, a divorce, a new baby or a move can leave a family without coverage in the middle of the year, and missing the special enrollment window can mean months uninsured until the next open enrollment. Knowing which events qualify, when the clock starts and how to avoid a gap protects both your health and your finances. This guide covers Marketplace special enrollment, and how it differs from job-based plans and Medicare.

2Open enrollment and special enrollment

Open enrollment runs each fall, starting November 1, for coverage the following year. The last day to enroll, and the deadline for coverage to start on January 1, depend on whether your state uses HealthCare.gov or runs its own Marketplace, so check this year's dates. Outside that window, you need a special enrollment period to buy a plan or to change the one you have.

3Which events qualify?

• Losing qualifying health coverage, such as job-based coverage, a Marketplace plan, Medicaid or CHIP, or a parent's plan at 26.
• Changes in household: getting married, having a baby, adopting a child or having a child placed with you for foster care. Divorce or a death qualifies only if it costs you coverage.
• Moving to a new ZIP code or county, to the United States, or to or from student or seasonal housing, if you had qualifying coverage for at least one day in the 60 days before the move.
• Other events, including gaining citizenship or lawful presence, being released from incarceration, leaving AmeriCorps service, and gaining access to an individual coverage arrangement from an employer.
• Exceptional circumstances, such as a serious illness, a natural disaster, or an error by the Marketplace or an assister that kept you from enrolling.

Losing coverage because you did not pay premiums, or dropping coverage voluntarily, generally does not qualify. Moving only for medical treatment or a vacation does not either.

4How long do you have, and when does coverage start?

In most cases you have 60 days from the event to choose a plan. For a loss of coverage you know is coming, such as the end of a job, you can also enroll up to 60 days before the loss, so the new plan starts the day after the old one ends. People who lose Medicaid or CHIP may have 90 days.

Coverage generally starts on the first day of the month after you pick a plan. For a birth, adoption or foster placement, it can start on the day of the event even if you enroll up to 60 days later.

5What changed for people with low incomes

From 2022 until August 2025, people with household income at or below 150 percent of the poverty line could enroll in a Marketplace plan in any month. CMS ended that window effective August 25, 2025, and income alone is no longer treated as an exceptional circumstance.

People with low incomes can still enroll during open enrollment or after any other qualifying event, and Medicaid and CHIP take applications all year. If your income is near or below the poverty line, check Medicaid first: in a state that expanded it, you may qualify without waiting for any window. Want to see what this could mean for your situation? Estimate your Marketplace subsidy with our free calculator, and our guide to Marketplace subsidies explains how the credit works.

6If you already have a Marketplace plan

Some events let you add someone or change plans mid-year. A new spouse or baby can be added to your plan, or the household can move to a new plan. For some events, if you are already enrolled, you can change only to a plan in the same metal level, such as from one silver plan to another, rather than any plan.

Changes in income do not usually let you change plans, but they do change your premium tax credit. Report them within 30 days so your monthly credit is adjusted, which avoids repaying a large amount at tax time; in some cases a change in eligibility for the credit can itself open a window to switch plans.

7Proving the event

You may be asked to send documents confirming the event, such as a letter from a former employer or insurer showing when coverage ended, a marriage certificate, a birth certificate, or a lease or utility bill showing the new address. The request includes a deadline; send the documents on time, or the plan can be canceled.

Keep records of the date of the event and the date you applied. If you were unable to enroll on time because of an error or an emergency, explain it and ask the Marketplace about an exceptional circumstances special enrollment period.

8Job-based plans and Medicare follow different rules

If you can join a job-based plan, through your own job or a spouse's, that plan has its own special enrollment rights: generally 30 days after events such as marriage, a birth or losing other coverage, and 60 days after losing Medicaid or CHIP. Ask the employer's benefits office.

Medicare has separate enrollment periods with their own deadlines and penalties, explained in our guide to Medicare sign-up deadlines. If you are turning 65, do not rely on a Marketplace window. And if you are offered COBRA after a job loss, you can choose a Marketplace plan instead during your special enrollment period; dropping COBRA later in the year does not open a new window unless another event occurs.

9Common mistakes

• Waiting until coverage has ended to apply, when you can enroll up to 60 days before a known loss.
• Assuming COBRA is the only option after a job loss.
• Missing the deadline for documents that prove the event.
• Assuming low income alone still opens a monthly window.
• Not adding a new baby within 60 days.

11What this does not tell you

The list of qualifying events and the rules for proof are set by CMS and may change. HealthCare.gov or your state Marketplace has the current rules.

State-run Marketplaces can offer extra special enrollment periods that HealthCare.gov does not, so check your state's exchange. Our calculator estimates your expected contribution, not whether you qualify to enroll.