Medicare Special Enrollment Periods (SEP): Change Your Plan Outside Open Enrollment
A Medicare Special Enrollment Period lets you change plans outside Open Enrollment when life changes. See which events qualify, how long you get, and how to switch.
A Medicare Special Enrollment Period (SEP) lets you join, switch, or drop a Medicare Advantage or Part D plan outside the normal enrollment windows when a qualifying life event happens. Most SEPs give you about two months to act. You do not have to wait for the Annual Enrollment Period if one of the situations below applies to you.
What is a Special Enrollment Period?
Medicare normally limits plan changes to set windows: your Initial Enrollment Period when you first become eligible, the Annual Enrollment Period (October 15 to December 7), and the Medicare Advantage Open Enrollment Period (January 1 to March 31). A Special Enrollment Period is the exception: certain life events open an extra window so you are not stuck in the wrong plan for a year. For the full calendar of windows, see our guide to Medicare enrollment periods.
Life events that qualify for a SEP
These are the most common situations that trigger a Special Enrollment Period:
| Situation | Typical window | What you can do |
|---|---|---|
| You move to a new address (outside your plan's service area, or one with new plan options) | Usually up to 2 months after the move | Switch to a plan available at your new address |
| You lose current coverage (employer, union, or COBRA) | About 2 months after coverage ends | Join a Medicare Advantage or Part D plan |
| You have Medicaid or qualify for Extra Help | Additional chances during the year (rules updated in 2025, confirm your current options) | Change your plan more than once a year |
| You qualify for a Special Needs Plan (chronic condition, or both Medicare and Medicaid) | When you become eligible | Enroll in a matching D-SNP or C-SNP |
| Your plan leaves Medicare or is not renewed | Roughly December 8 to the end of February | Pick a new plan or return to Original Medicare |
| You move into, live in, or leave a nursing home or long-term care facility | While there, plus 2 months after leaving | Join, switch, or drop a plan |
| You want to switch to a 5-star plan | Once a year, December 8 to November 30 | Move to a 5-star Medicare Advantage or Part D plan, if one is offered in your area |
| A federal error, disaster, or other exceptional circumstance affected you | Varies by situation | Make a change Medicare allows for that circumstance |
The exact length of each window depends on the event and, in some cases, on whether you notify your plan before or after it happens. If you think an event applies to you, confirm your specific window before you assume it has closed.
SEP vs AEP vs OEP: which is which?
These get mixed up often:
- AEP (Annual Enrollment Period), October 15 to December 7: open to everyone. Change plans for any reason. See our Open Enrollment checklist.
- OEP (Medicare Advantage Open Enrollment Period), January 1 to March 31: only if you are already in a Medicare Advantage plan, and you get one change.
- SEP (Special Enrollment Period): any time of year, but only if a qualifying life event opens it for you.
How to use a Special Enrollment Period
Once you confirm you qualify, you enroll the same way you would during any other window: through Medicare.gov, by calling 1-800-MEDICARE, through the plan, or with a licensed advocate. In most cases your new coverage starts the first day of the month after you enroll. Keep documentation of your qualifying event (a move date, a coverage-loss letter) in case the plan asks for proof.
If you have Medicaid or Extra Help, you may have more flexibility than most people. Because those SEP rules changed in 2025, it is worth checking your current options rather than relying on older guidance. Our guides to Extra Help and Medicare Savings Programs explain those programs, and qualifying for one can also open a plan-change window.
Common questions about Special Enrollment Periods
What qualifies for a Medicare Special Enrollment Period?
Common triggers include moving to a new area, losing employer or union coverage, gaining or losing Medicaid or Extra Help, qualifying for a Special Needs Plan, your plan leaving Medicare, moving into or out of a nursing home, or a federally declared disaster. Each event has its own window.
How long is a Special Enrollment Period?
Most SEPs last about two months from the qualifying event, but the exact length varies by event. Some, like the 5-star plan SEP, run on a fixed calendar instead.
Can I change my Medicare plan any time of year?
Only if you have a qualifying event that opens a Special Enrollment Period, or if you have Medicaid or Extra Help, which can give extra windows. Otherwise, plan changes are limited to the Annual Enrollment Period and the Medicare Advantage Open Enrollment Period.
Do I get a Special Enrollment Period if I move?
Usually yes, if you move outside your current plan's service area or to an area with new plan options. The window is typically the month of your move plus about two months, and telling your plan ahead of time can give you more time.
Does losing my job trigger a Special Enrollment Period?
Yes. Losing employer or union coverage (including COBRA ending) generally opens a Special Enrollment Period of about two months to join a Medicare Advantage or Part D plan.
Not sure whether a life change qualifies you for a Special Enrollment Period? A licensed Medicare Advocate can confirm your window and help you switch to a better plan before it closes, at no cost. Give us a call.