Medicare Special Enrollment Periods (SEPs): When You Can Change Plans Outside AEP

Most Medicare plan changes happen during the Annual Enrollment Period (October 15 – December 7). But life doesn’t follow the calendar. A Special Enrollment Period (SEP) lets you make changes outside the normal windows when certain things happen.

I’m Michael Cubell, a licensed independent agent with Triangle Life & Health (licensed since 2013, NPN 16899969). I help people in 15 states sort through Medicare every day. Here’s the plain-English version.

SEP to Sign Up for Medicare Part A and Part B

If you delayed Part B because you (or your spouse) had group health coverage from current employment, you can sign up any time you’re still covered, or during the 8 months after the job or coverage ends, whichever happens first. Usually there’s no late penalty. COBRA and retiree coverage don’t count as current employment. More in Part B late enrollment penalty explained.

There are also exceptional-circumstance SEPs if you missed your window because of a natural disaster or emergency, an employer or health plan error, incarceration, losing Medicaid, or other situations Medicare decides were outside your control.

Common SEPs to Join or Switch Medicare Advantage or Part D Plans

If this happens…	You can generally…
You move out of your plan’s service area (or to an area with new plan options)	Switch to a plan available at your new address. The window usually starts the month before your move and lasts 2 full months after
You lose employer or union coverage	Join a Medicare Advantage or Part D plan. The window usually lasts 2 full months after the month your coverage ends
You have Medicaid or Extra Help	Make certain changes once per calendar month, such as switching to Original Medicare with a stand-alone Part D plan
You lose Medicaid eligibility	Make a one-time change to your Medicare coverage
You move into, live in, or move out of a nursing home or similar facility	Join, switch, or drop a plan while you live there and for 2 full months after you leave
A 5-star rated plan is available in your area	Switch to that 5-star plan once between December 8 and November 30 of the following year
Your plan leaves Medicare or its contract ends	Choose a new plan

Exact timing depends on the situation. Medicare.gov and your plan have the details for your specific case.

How SEPs Fit With the Other Enrollment Periods

Period	When	What you can do
Annual Enrollment Period (AEP)	Oct 15 – Dec 7	Join, switch, or drop Medicare Advantage and Part D plans (effective Jan 1)
Medicare Advantage Open Enrollment	Jan 1 – Mar 31	If you’re in a Medicare Advantage plan: switch to another one, or go back to Original Medicare (one change)
General Enrollment Period	Jan 1 – Mar 31	Sign up for Part A/B if you missed your initial window
Special Enrollment Period	Varies by event	Changes tied to a qualifying life event

What About Medigap?

Medicare Supplement (Medigap) plans don’t use SEPs. Your best window is your 6-month Medigap Open Enrollment Period, which starts when you’re 65 or older and enrolled in Part B. After that, you may have to answer health questions, unless you have a guaranteed issue right (for example, your Medicare Advantage plan leaves your area, or you lose certain employer coverage). Some states add extra protections. North Carolina does not have a Medigap “birthday rule.” See how switching Medigap plans works.

Planning changes for next year? Start with my AEP guide.

Frequently Asked Questions

What is a Medicare Special Enrollment Period?

It’s a window to join, switch, or drop Medicare coverage outside the normal enrollment periods because of a qualifying life event, such as moving, losing employer coverage, or qualifying for Medicaid or Extra Help.

How long do I have to sign up for Part B after my employer coverage ends?

Generally 8 months after the job or the coverage ends, whichever happens first, as long as the coverage was based on current employment. COBRA and retiree coverage don’t count.

Can I change my Medicare Advantage plan if I move?

Usually, yes. If you move out of your plan’s service area, or to an area with new plan options, you can switch plans. The window generally starts the month before your move and lasts 2 full months after.

Can people with Extra Help change plans any time?

People with Medicaid or Extra Help can make certain changes once per calendar month, such as switching to Original Medicare with a stand-alone Part D plan. The change takes effect the first day of the next month.

What is the 5-star Special Enrollment Period?

If a Medicare Advantage or Part D plan with a 5-star overall rating is available in your area, you can switch to it once between December 8 and November 30 of the following year.

Questions? Let’s Talk It Through

Had a life change and not sure whether it opens an enrollment window? Call me at (919) 944-8443 or schedule a free consultation. No pressure, just straight answers.

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