Medicare Special Enrollment Periods: When You Can Change Plans Outside Open Enrollment

There are three main windows to enroll in Medicare or change your coverage: your Initial Enrollment Period (IEP), the Annual Enrollment Period (AEP from October 15 – December 7), and Special Enrollment Periods (SEPs). Most people are familiar with the first two. SEPs are less understood — but they are often the most valuable tool for beneficiaries dealing with a life change outside the standard enrollment windows.

Here is a complete guide to Medicare SEPs and when they apply.

What Is a Special Enrollment Period?

A Special Enrollment Period is a designated window during which you can enroll in, change, or drop Medicare coverage outside of your IEP or AEP. Each SEP is triggered by a specific qualifying life event, and each has its own time window and rules.

There are separate SEPs for Original Medicare (Parts A and B), Medicare Advantage, and Part D. They do not all work the same way.

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SEPs for Original Medicare (Parts A and B)

Losing Employer or Union Health Coverage#

Qualifying event: You or your spouse's active employer or union coverage ends — due to retirement, job loss, or the employer stopping coverage.

Window: You have 8 months from the date the employer coverage ends (or the employment ends, whichever comes first) to enroll in Part A and/or Part B.

Critical note: COBRA and retiree health plans do NOT count as active employer coverage for this purpose. Once you move to COBRA, your 8-month SEP clock starts.

Other Employer-Based SEPs#

Additional SEPs for Parts A and B apply if:

• You were enrolled in a TRICARE plan and lost that coverage
• You were covered by a federal employee health benefits plan and coverage ended
• You were enrolled in a Health Reimbursement Arrangement (HRA) and the sponsoring employer went bankrupt

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SEPs for Medicare Advantage

Medicare Advantage SEPs are more numerous and apply to a wider range of situations.

Moving Outside Your Plan's Service Area#

Window: 2 months after you move. (You may also use the SEP starting 1 month before your scheduled move.)

This applies whether you move across town to a different county or across the country to a different state. If your plan does not serve your new address, you have a guaranteed enrollment window.

Plan Leaving Your Area#

Window: 2 months before the plan's termination date, up to 2 months after.

If your Medicare Advantage plan is discontinued or leaves your service area, you are entitled to enroll in another plan or return to Original Medicare.

Five-Star SEP#

Window: Available once per year, December 8 through November 30 of the following year, to switch to any 5-star rated Medicare Advantage plan available in your area.

This is the only Medicare Advantage enrollment opportunity available outside of AEP that is not tied to a life event.

Losing Other Coverage (Involuntary)#

Window: 2 months from the date you lose coverage.

If you involuntarily lose coverage from an employer plan, Medicaid, TRICARE, or similar, you have a 2-month SEP to enroll in Medicare Advantage.

Qualifying for Extra Help (Low Income Subsidy)#

Beneficiaries who gain or lose eligibility for Extra Help (LIS) have an SEP to change their drug coverage.

Newly Qualifying for Both Medicare and Medicaid (Dual Eligible)#

Dual-eligible beneficiaries (qualifying for both Medicare and Medicaid) have a monthly SEP to change their Medicare Advantage plan. This is one of the most flexible SEPs available.

First Year of Medicare Advantage (Trial Right)#

Window: Anytime in the first 12 months of your first Medicare Advantage enrollment.

If you enrolled in Medicare Advantage at 65 and decide it is not right for you within the first year, you have a guaranteed right to switch back to Original Medicare and purchase a Medigap plan from any carrier at standard rates (no underwriting). This is the most valuable SEP most beneficiaries do not know about.

Other Medicare Advantage SEPs#

SEPs also exist for:

• Entering or leaving a skilled nursing facility
• Being released from incarceration
• Enrolling in or losing PACE (Program of All-Inclusive Care for the Elderly)
• Errors by your plan or CMS

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SEPs for Part D (Prescription Drug Plans)

Moving to a New Service Area#

If your Part D plan is not available in your new location, you have a 2-month SEP to enroll in a new Part D plan.

Gaining or Losing Other Drug Coverage#

If you lose creditable prescription drug coverage (e.g., from an employer, union, or TRICARE), you have a 2-month SEP to enroll in Part D.

If you are still within the window after losing coverage and enroll in Part D promptly, you avoid the late enrollment penalty. Wait too long and the penalty applies permanently.

Gaining Extra Help Eligibility#

Beneficiaries who gain eligibility for Extra Help can use an SEP to enroll in or change a Part D plan.

Errors and Exceptional Circumstances#

CMS grants SEPs on a case-by-case basis when your enrollment was affected by natural disasters, plan or government errors, or other extraordinary circumstances beyond your control.

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SEPs to Know for the Southeast

If you are in Florida, Alabama, Georgia, or North Carolina, a few SEPs are particularly relevant:

Moving between Southeast states: Florida retirees moving to Georgia or North Carolina, or the reverse, qualify for the moving SEP for Medicare Advantage and Part D.

Retiring from state or local government: Many Southeast state employees had pension-based health plans. When that coverage ends at retirement, the employer coverage SEP applies.

Transitioning from VA/TRICARE: Veterans in the Southeast who use VA health benefits and are transitioning to or adding Medicare coverage have specific SEPs available.

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Navigating SEPs on your own can be confusing. Schedule a free consultation if you have had a qualifying life event and want to make sure you are using the right enrollment window correctly.

Licensed in Florida, Alabama, Georgia, and North Carolina.

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Frequently Asked Questions#

How long does a Medicare Advantage SEP last after a qualifying event? Most Medicare Advantage SEPs last 2 months from the qualifying event. The moving SEP can start up to 1 month before the move and lasts 2 months after.

Does divorce or losing a spouse trigger a Medicare SEP? If you lose employer-sponsored health coverage as a result of a divorce or a spouse's death, the losing-employer-coverage SEP applies. The 8-month window for Part B or 2-month window for Medicare Advantage starts when the coverage ends.

Can I use an SEP to switch from Medicare Advantage to Medigap? SEPs allow you to switch Medicare Advantage plans or move to Original Medicare, but switching to a Medigap plan requires a separate qualification. Most states require medical underwriting for Medigap outside of your initial enrollment window, even if you have a Medicare Advantage SEP. The first-year trial right is the main exception.

What if I missed my SEP deadline? In most cases, missing an SEP means waiting for the next available enrollment window — usually AEP (October 15–December 7) for Medicare Advantage and Part D. For Part B, missing the SEP can mean waiting for the General Enrollment Period (January 1 – March 31) with coverage starting July 1, plus a potential late enrollment penalty. Contact a Medicare advisor promptly if you think you may have missed a window.