Special Enrollment Periods explained — qualifying life events for ACA and Medicare
A Special Enrollment Period (SEP) lets you sign up for ACA or Medicare coverage outside the normal Open Enrollment / Annual Enrollment windows. Different qualifying life events trigger SEPs for different programs. Here's the complete list — for both ACA and Medicare.
Key takeaways
- Both ACA and Medicare offer SEPs — but the qualifying events are different for each program.
- Most SEPs give you a 60-day window from the event date to enroll. Don't wait.
- ACA SEPs include loss of coverage, marriage, birth, moving, income change. Medicare SEPs are usually employer-coverage related.
- You generally need to document the qualifying event (e.g. termination letter, marriage certificate, lease) to enroll via SEP.
What is a Special Enrollment Period?
Both the ACA Marketplace and Medicare have a single annual Open Enrollment / Annual Enrollment Period — a few weeks each fall when anyone can sign up or switch plans. Outside that window, you generally can't make changes to your coverage.
A Special Enrollment Period is the exception. Certain life events — losing your job, moving, having a baby, turning 65 — open a temporary window for you to enroll or change plans, even if Open Enrollment is months away.
Each program has its own list of qualifying events. The window is usually 60 days from the event date, though Medicare has some longer windows (up to 8 months for losing employer coverage).
ACA / Marketplace Special Enrollment Periods
These trigger a 60-day SEP to enroll in or switch ACA plans on HealthCare.gov or your state Marketplace:
- Loss of qualifying coverage — losing your job-based plan, COBRA running out, aging off a parent's plan at 26, losing Medicaid or CHIP.
- Household changes — getting married, having a baby, adopting, divorce that changes coverage.
- Moving — to a new ZIP, county, state, or back to the U.S. from abroad. The move must change your plan options.
- Income changes — significant income shift that changes subsidy eligibility (especially relevant if your income drops below 150% FPL or above 400% FPL).
- Becoming a U.S. citizen.
- Domestic violence or spousal abandonment — a special path that lets survivors enroll separately from a spouse.
- Errors or misconduct by an enrollment counselor or insurance company that prevented you from enrolling correctly.
- Native American / Alaska Native enrollment — members of federally recognized tribes can change Marketplace plans monthly.
Medicare Special Enrollment Periods
Medicare has different SEPs for Part B (medical), Part D (drugs), and Medicare Advantage. The most common Medicare SEPs:
- Loss of employer coverage — when you (or your spouse) stop working and lose group coverage. 8-month SEP for Part B; 2-month SEP for Part D / MA. This is the big one.
- Moving — out of your plan's service area, into a new state, or back from abroad. 2-month SEP for changing MA / Part D plans.
- Moving into or out of a nursing facility — month of move + 2 months after.
- Qualifying for Extra Help (Low Income Subsidy) for Part D — monthly enrollment changes allowed.
- Dual eligibility — qualifying for both Medicare and Medicaid lets you switch MA / Part D plans more frequently.
- 5-star plan SEP — once a year you can switch to a Medicare Advantage or Part D plan with a 5-star CMS rating.
- Plan termination or contract changes — your MA / Part D plan stops being offered, or substantially changes its benefits.
- Returning from incarceration.
- Retroactive Medicare entitlement — if Social Security awards you Medicare retroactively (often after a disability determination).
What documentation you'll need
For ACA SEPs, the Marketplace will usually request proof of the qualifying event within 30 days of your enrollment. Acceptable documents include:
- Loss of coverage: a letter from your former insurance company or employer showing the date coverage ended.
- Marriage: a marriage certificate.
- Birth: a birth certificate or hospital record.
- Moving: a lease, mortgage statement, utility bill, or driver's license at the new address.
- Citizenship: a naturalization certificate.
For Medicare SEPs, documentation is usually less formal — but you should keep proof of the qualifying event in case Medicare or your plan asks. A letter from your employer's HR documenting the date your group coverage ended is the most common one for the 8-month Part B SEP.
How SilverEdge helps with SEPs
Most consumers don't realize they qualify for a SEP until it's almost too late. We routinely talk with people in the 4th week of their 60-day window who think they have to wait until November for Open Enrollment.
We can verify your SEP eligibility, gather the documentation, choose the right plan, and enroll you — typically within 30-60 minutes by phone. There's no charge for our help; carriers pay our commission when you enroll.
If you've experienced a life event in the last 60 days and aren't sure whether you qualify, call us. Even if you don't qualify for a SEP, we can usually point you toward an alternative path.
Questions about your specific situation?
A licensed SilverEdge advisor can walk through your exact options in 15 minutes by phone — free, no pressure.