Medicare

Medicare Special Enrollment Periods: When You Can Change Plans

Special Enrollment Periods let you enroll in or switch Medicare plans outside of the standard Annual Enrollment Period. Qualifying events like moving, losing coverage, or gaining Medicaid open a time-limited window to make changes to your Medicare coverage.

What Is a Medicare Special Enrollment Period?

A Special Enrollment Period (SEP) is a designated time window when you can make changes to your Medicare coverage outside of the standard enrollment periods. Normally, you can only enroll in or switch Medicare Advantage and Part D plans during the Annual Enrollment Period (October 15 through December 7) or the Medicare Advantage Open Enrollment Period (January 1 through March 31).

SEPs exist because life circumstances change. Moving to a new state, losing employer health insurance, qualifying for Medicaid, or entering a nursing facility are all events that may require you to adjust your Medicare coverage on a timeline that does not align with standard enrollment windows.

Each SEP has specific rules about who qualifies, what changes you can make, and how long the window stays open. Understanding your SEP options helps you avoid gaps in coverage and find the best plan for your current situation.

Common Qualifying Events for a Medicare SEP

Not every life change triggers a Special Enrollment Period. CMS defines specific qualifying events that open an SEP window. Here are the most common situations that allow you to change your Medicare plan outside of regular enrollment.

Moving Out of Your Plan's Service Area

If you permanently move to a new address that is outside your current Medicare Advantage or Part D plan's service area, you qualify for a 63-day SEP. This applies whether you move across town to a different county or across the country to a different state. Temporary relocations generally do not qualify.

Losing Employer or Union Coverage

When you or your spouse lose health coverage through an employer or union, or your employer stops contributing to your plan, you receive an SEP to enroll in Medicare Part B, a Medicare Advantage plan, or a Part D plan. This also applies if you retire and lose retiree health benefits.

Gaining or Losing Medicaid Eligibility

Becoming newly eligible for Medicaid, or losing Medicaid eligibility, triggers an SEP. This is particularly important because gaining Medicaid makes you dual-eligible and opens access to D-SNP plans that combine Medicare and Medicaid benefits under one plan with enhanced benefits.

Receiving Extra Help (Low-Income Subsidy)

If you qualify for Medicare's Extra Help program, which assists with Part D prescription drug costs, you receive an SEP to switch Part D or Medicare Advantage plans once per quarter during the first three quarters of the year.

Entering or Leaving a Nursing Facility

Moving into or out of a skilled nursing facility, long-term care facility, or similar institution triggers an SEP that allows you to switch to a plan better suited to your care needs. This SEP is available for as long as you reside in the facility and for two months after you leave.

Other Qualifying Events

Your current plan leaves your area or stops offering coverage
You move back to the United States after living abroad
You are released from incarceration
You lose coverage under TRICARE, VA, or another federal program
Your plan's contract with Medicare is terminated
You experience a natural disaster declared by FEMA in your area

How Long Do Medicare Special Enrollment Periods Last?

The duration of an SEP depends on the qualifying event that triggered it. Most SEPs last 60 to 63 days, but some have different timeframes. Acting quickly is important because once the window closes, you typically must wait until the next standard enrollment period.

Move to new service area: 63 days from your move date or the date you notify your plan, whichever is later.
Loss of employer coverage: 63 days from the date coverage ends (or 63 days before, if you know the end date in advance).
Gaining Medicaid: 60 days from the date you become Medicaid-eligible.
Nursing facility: While residing in the facility and for two full months after discharge.
Plan contract termination: Varies, but CMS typically provides a special window to transition to a new plan.

The Dual-Eligible Quarterly SEP

Beneficiaries who qualify for both Medicare and Medicaid receive one of the most flexible enrollment options in the Medicare system. The dual-eligible quarterly SEP allows you to switch Medicare Advantage or D-SNP plans once during each of the first three quarters of the calendar year.

Quarterly Windows

Quarter 1: January 1 through March 31
Quarter 2: April 1 through June 30
Quarter 3: July 1 through September 30

You can make one plan change per quarter, for up to three changes per year in addition to any changes made during the Annual Enrollment Period. This SEP is automatically available to anyone who is dual-eligible. No application or proof of a qualifying event is needed beyond your existing Medicaid status.

This flexibility is especially valuable if your health needs change during the year, if a new D-SNP becomes available in your area, or if you are unsatisfied with your current plan's provider network or formulary. Learn more about D-SNP plans for dual-eligible beneficiaries.

The 5-Star Plan Special Enrollment Period

Every year, CMS rates Medicare Advantage and Part D plans on a scale of one to five stars based on quality measures including customer satisfaction, health outcomes, and plan administration. Plans that earn an overall rating of five stars are considered top performers.

If a 5-star plan is available in your area, you can use this special SEP to enroll in it once per year between December 8 and November 30. Unlike most other SEPs, you do not need a qualifying life event. Any Medicare beneficiary can use this SEP as long as a 5-star plan serves their ZIP code.

Key Details

Available to all Medicare beneficiaries, not just those with qualifying events
Can be used once per year (December 8 through November 30)
Only applies to plans with an overall 5-star CMS quality rating
Coverage typically starts the first day of the month after enrollment
Check Medicare.gov or ask a licensed agent for 5-star plans in your ZIP code

How to Prove Your SEP Eligibility

When you request to enroll in or switch plans using a Special Enrollment Period, your new plan or Medicare may ask for documentation to verify your qualifying event. Having the right paperwork ready can speed up the enrollment process and prevent delays in your coverage start date.

Documentation by Qualifying Event

Move:Updated driver's license, new lease or mortgage statement, utility bill at your new address, or USPS change-of-address confirmation.
Loss of coverage: Termination letter from your employer or insurer, COBRA election notice, or a letter from your plan confirming the coverage end date.
Medicaid eligibility: Approval letter from your state Medicaid agency showing your eligibility start date.
Nursing facility: Admission or discharge records from the facility.
Extra Help qualification: Award letter from Social Security or your state confirming Low-Income Subsidy eligibility.

If you are unsure what documentation you need, a licensed Medicare agent can walk you through the process. In some cases, the plan may verify your qualifying event directly with Medicare or your state agency without requiring paperwork from you.

Frequently Asked Questions

What is a Medicare Special Enrollment Period?

A Special Enrollment Period (SEP) is a window of time outside the standard enrollment periods when you can enroll in, switch, or drop a Medicare plan. SEPs are triggered by specific life events called qualifying events, such as moving to a new service area, losing employer coverage, or gaining Medicaid eligibility. Each SEP has its own rules and timeframe.

Can I change my Medicare plan if I move?

Yes. If you permanently move to a new address outside your current plan's service area, you qualify for a Special Enrollment Period. You have 63 days from the date of your move to enroll in a new Medicare Advantage or Part D plan available in your new area. Make sure to update your address with Medicare and Social Security.

How long does a Medicare SEP last?

Most Medicare Special Enrollment Periods last 60 to 63 days from the date of the qualifying event. However, the exact duration depends on the specific SEP type. For example, the dual-eligible quarterly SEP allows changes once per quarter during the first three quarters of the year, and the 5-star plan SEP runs from December 8 through November 30.

What is the dual-eligible quarterly SEP?

If you qualify for both Medicare and Medicaid (dual-eligible), you can use a Special Enrollment Period to switch Medicare Advantage or D-SNP plans once per quarter during January through March, April through June, and July through September. This gives dual-eligible beneficiaries up to three additional opportunities per year to change plans.

Can I switch to a 5-star Medicare plan at any time?

You can switch to a Medicare Advantage or Part D plan that has earned a 5-star overall quality rating once per year between December 8 and November 30. This SEP is available to all Medicare beneficiaries, not just those with a qualifying life event. Check Medicare.gov for current 5-star rated plans in your area.

How do I prove I qualify for a Special Enrollment Period?

Documentation requirements depend on the qualifying event. For a move, you may need a utility bill, lease agreement, or updated driver's license. For loss of coverage, your previous insurer's termination letter works. For Medicaid eligibility, a notice from your state Medicaid agency is sufficient. Your Medicare plan or a licensed agent can guide you on what documents to provide.

Is losing employer coverage a qualifying event for a Medicare SEP?

Yes. If you or your spouse lose employer-sponsored health coverage or your employer stops contributing to your coverage, you qualify for a Special Enrollment Period. You have 63 days from the date coverage ends to enroll in Medicare Part B (if not already enrolled), a Medicare Advantage plan, or a Part D prescription drug plan without penalties.

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