Special Enrollment Periods: How to Get ACA Coverage Outside Open Enrollment
Health Insurance GuideA Special Enrollment Period (SEP) lets you sign up for an ACA Marketplace plan outside the November–January open enrollment window. You need a qualifying life event — things like losing job-based coverage, getting married, having a baby, or moving. Most SEPs give you 60 days from the event date to enroll. Losing Medicaid gives you 90 days in most states.
Key Facts
- Standard SEP window
- 60 days from the qualifying life event (HealthCare.gov)
- Medicaid/CHIP loss SEP window
- 90 days in most states — longer to account for the Medicaid redetermination process (CMS)
- Open enrollment dates (next cycle)
- November 1 – January 15 each year on HealthCare.gov
- Proof required
- Since May 2025, HealthCare.gov requires documentation within 30 days of plan selection for most SEP types
- Coverage start
- Usually the 1st of the month after you enroll, unless loss of coverage was involuntary
What is a Special Enrollment Period?
The ACA's open enrollment period runs from November 1 through January 15 on HealthCare.gov. Outside those dates, you generally cannot sign up for a Marketplace plan. A Special Enrollment Period is the exception — it is a window that opens when a qualifying life event changes your health coverage situation.
SEPs exist because life does not schedule itself around open enrollment. You lose a job in April. You turn 26 in July and age off a parent's plan. You get married in September. All of these can open a window to get covered.
The rules come from CMS and are described on HealthCare.gov. Some state-run Marketplaces — California, New York, and others — have their own rules that may be slightly more generous, so check your state exchange if you are not on HealthCare.gov.
Qualifying life events: what actually counts
CMS organizes qualifying life events into four main categories. Knowing which bucket your situation falls into matters because coverage start dates and documentation rules vary slightly.
Loss of coverage covers losing job-based insurance, aging off a parent's plan at 26, losing COBRA, losing a student health plan, or losing coverage because a spouse or parent lost their job. This is the most common SEP trigger. Voluntary cancellation of your own plan does not count — it has to be involuntary.
Household changes include marriage, divorce, birth, adoption, or a dependent losing eligibility. Moving counts if you move to a new ZIP code or county that has different health plan options — a move within the same coverage area usually does not qualify. Changes in income or household size that affect your Medicaid eligibility also trigger a SEP.
| Category | Examples | SEP Window |
|---|---|---|
| Loss of coverage | Job loss, aging off parent's plan at 26, COBRA expiration | 60 days |
| Household change | Marriage, divorce, birth, adoption | 60 days |
| Residential move | Move to new ZIP/county with different plan options, move from abroad | 60 days |
| Medicaid/CHIP loss | Income increase causes Medicaid termination | 90 days (most states) |
| Income change | Income drops into or out of Medicaid range | 60 days |
Source: HealthCare.gov; CMS Special Enrollment Period fact sheet
The 60-day clock: when it starts and when it ends
For most qualifying events, your 60-day window begins on the date of the event itself. Lose your job-based insurance on June 30? Your SEP runs through August 28. Miss that window and you wait until the next open enrollment period — November 1.
There is one important exception for anticipated loss of coverage. If you know you will lose coverage — say your employer plan ends on a known date — you can enroll up to 60 days before that date on HealthCare.gov. This lets you avoid any gap in coverage.
Medicaid and CHIP loss gets a longer window: 90 days in most states. This reflects the Medicaid redetermination process, where a state can reverse a termination within 90 days. Source: CMS.
Documentation: what HealthCare.gov now requires
Since May 2025, HealthCare.gov requires proof of your qualifying life event for most SEP types. You have 30 days from the date you select a plan to upload documentation. If you don't submit it in time, your enrollment can be cancelled.
For loss of job-based coverage, acceptable documents include a letter from your employer or insurer showing the coverage end date, a COBRA election notice, or pay stubs showing the last date of health benefits. For a move, utility bills, a lease, or a government document with your new address work. For a birth or adoption, a birth certificate or adoption decree is standard.
Do not wait to gather paperwork. Have it ready before you enroll if you can. HealthCare.gov's SEP verification page shows the accepted document types for each event.
What does not count as a qualifying event
Voluntary decisions almost never trigger a SEP. Canceling your own plan, quitting a job that had insurance, or dropping a spouse from your employer plan by choice do not open a window.
Getting a raise or having your income increase above the subsidy threshold is not itself a SEP, though it may affect your tax credit reconciliation at filing time. Changing your mind about the plan you picked during open enrollment is also not a qualifying event.
If you are not sure whether your situation qualifies, call HealthCare.gov at 1-800-318-2596 or use a licensed broker. Claiming a SEP you do not qualify for can result in owing back the premium tax credits you used during the coverage period.
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See If I Qualify →Frequently Asked Questions
Can I use a SEP if I never had insurance before?
Some situations that leave you newly uninsured can qualify, but it depends on the reason. Simply not having had insurance before open enrollment does not create a SEP. If you are newly released from incarceration, newly lawfully present in the US, or newly gaining citizenship, those are qualifying events. Check HealthCare.gov's full SEP list for your specific situation.
What if I miss the 60-day window?
You generally must wait until the next open enrollment period, which starts November 1. However, if you have very low income, you may qualify for Medicaid year-round with no enrollment window. Check your state Medicaid office regardless of time of year.
Does moving to a new apartment in the same city qualify?
Usually no. A move qualifies only if you move to an area with different health plan options — typically a different county or ZIP code that is outside your current plan's coverage area. Moving across town to a new address in the same county usually does not trigger a SEP.
Can I use a SEP to change my plan, or only to get new coverage?
You can use a SEP to enroll for the first time or to switch plans. For example, if you get married and move to your spouse's city, you can use the move SEP to pick a plan in your new area even if you already have Marketplace coverage.