What qualifies for a Medicare Special Enrollment Period?

Qualifying life events for a Medicare Special Enrollment Period include: losing employer or union health coverage, moving to a new address outside your current plan's service area, moving into or out of a nursing home or care facility, gaining or losing Medicaid eligibility, your Medicare plan leaving your area or losing Medicare contract status, and qualifying for the Extra Help low-income subsidy program. Each SEP has its own rules and time window.

When can I switch Medicare Advantage plans?

You can switch Medicare Advantage plans during the Annual Enrollment Period (October 15 - December 7), the Medicare Advantage Open Enrollment Period (January 1 - March 31), or if you qualify for a Special Enrollment Period due to a life event. Changes made during AEP take effect January 1. Changes made during the OEP also take effect the first of the following month.

Medicare Plan Changes

Lost Coverage? Moving? Retiring?
You May Be Able to
Change Your Medicare Plan
— Not Just in October.

Q: Can I change my Medicare plan outside of open enrollment?

Yes. You can change your Medicare plan outside of the October 15 - December 7 Annual Enrollment Period if you qualify for a Special Enrollment Period (SEP). SEPs are triggered by specific life events such as losing employer health coverage, moving to a new address outside your plan's service area, qualifying for Medicaid, or your plan leaving Medicare. SEP length varies by event. Many run for about two calendar months after the month the event happens, but some are shorter and some last much longer, so it is worth confirming the exact dates for your situation.

Q: How long do I have to change my Medicare plan after losing employer insurance?

You can make the change while you still have the employer coverage, and the window stays open until two months after the month that coverage ends. Separately, to enroll in Medicare Part B without a late penalty, you get an eight-month Special Enrollment Period after your employer coverage ends — that Part B window and the plan-selection window are different lengths, which catches people out. Missing the plan window means waiting for the next Annual Enrollment Period (October 15 - December 7), with coverage not starting until January 1. Read our enrollment windows guide →

Q: What is the Medicare Annual Enrollment Period?

The Medicare Annual Enrollment Period (AEP), also called Open Enrollment, runs from October 15 to December 7 each year. During this period, anyone on Medicare can switch from Original Medicare to Medicare Advantage, switch between Medicare Advantage plans, change their Part D drug plan, or return to Original Medicare. Changes take effect January 1 of the following year.

Q: Can I change my Medicare plan if I move?

Yes. Moving to a new address that is outside your current Medicare Advantage or Part D plan's service area qualifies you for a Special Enrollment Period. If you tell your plan before you move, the window opens the month before the move; otherwise it opens the date you move. Either way it runs until two months after the month it began or the month of the move, whichever is later. Even moving within the same county can qualify if your plan's network does not cover your new area.

Most seniors don't realize they can change their Medicare plan outside of the October–December enrollment window. If your life situation has changed — a job loss, a move, a retirement, a shift in income — you may qualify for a Special Enrollment Period that lets you switch plans immediately.

Think You Qualify?
Let's Find Out — At No Cost.

Special Enrollment Periods don't stay open indefinitely — many close about two months after the month your qualifying event happened. If your situation recently changed, it's worth finding out where you stand.

⏱ SEP windows are time-sensitive, and the length depends on which one you qualify for.

Get My Medicare Review →

No-cost, no-obligation consultation with a licensed PharmSurance advisor.

Qualifying Life Events

Reasons You Can Change
Your Medicare Plan
Outside of October

These are called Special Enrollment Period (SEP) triggers. If any of these apply to you, you likely have a limited window to make a change — and a PharmSurance advisor can help you act before it closes.

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Job & Retirement

Lost Employer or Union Health Coverage

If you were covered by an employer or union health plan — whether your own or a spouse's — and that coverage ended, you qualify for a Special Enrollment Period. This is one of the most common SEP triggers and applies whether you retired, were laid off, your employer stopped offering coverage, or your spouse's employer changed benefits.

⏱ Open while you still have the coverage, and until 2 months after the month it ends

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Relocation

Moved to a New Address or Service Area

Moving outside your current plan's service area — even within the same state — triggers a Special Enrollment Period. Medicare Advantage and Part D plans operate within defined geographic areas. If your new address falls outside that area, you must select a new plan. Even a move within the same county can qualify if your plan doesn't serve your new location.

⏱ Until 2 months after the month you move — starts a month early if you tell your plan in advance

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Care Facility

Moved Into or Out of a Nursing
Home or Care Facility

If you moved into a skilled nursing facility, long-term care facility, or similar institution — or have recently been discharged from one — you qualify for a Special Enrollment Period. This allows you to select a plan that better fits your new care situation and location.

⏱ Open the whole time you live there, and until 2 months after the month you move out

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Plan Issues

Your Plan Left Medicare or
Left Your Area

If your Medicare Advantage or Part D plan lost its Medicare contract, stopped serving your area, or is being discontinued at the end of the year, you automatically qualify for a Special Enrollment Period to select a replacement plan. You should receive a notice from your plan if this happens.

⏱ Timing depends on how and when the plan ends — confirm your exact dates

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Income & Benefits

Gained or Lost Medicaid or Extra Help

If you gain or lose Medicaid, or your Extra Help (Low Income Subsidy) status changes, you get a Special Enrollment Period allowing one plan change, running three months from the change or your notice of it. Some dual-eligible individuals also have a narrower monthly election available — worth confirming with an advisor, since exactly what it lets you change depends on your specific situation.

⏱ Three months from the change or your notice of it

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Plan Quality

CMS Flagged Your Plan for Quality Reasons

CMS evaluates plan performance every year, and in some circumstances that evaluation opens a Special Enrollment Period allowing you to switch plans outside the usual windows. Whether this applies to your specific plan, and what your options would be, is worth confirming with an advisor rather than assuming.

⏱ Ask an advisor whether this applies to you

When You Can Make Changes

All the Medicare
Enrollment Windows
You Need to Know

There are three main ways to make changes to your Medicare coverage. Understanding which window applies to your situation is the first step.

Every Year

October 15 – December 7

Annual Enrollment Period (AEP)

The main yearly window when anyone on Medicare can make changes. You can switch between Original Medicare and Medicare Advantage, change Advantage plans, add or change a Part D drug plan, or drop a plan entirely. Changes take effect January 1.

January 1 – March 31

Medicare Advantage Open Enrollment Period (OEP)

If you were enrolled in a Medicare Advantage plan on January 1, you get one change: switch to a different Advantage plan, or drop back to Original Medicare. If you return to Original Medicare, a coordinating Part D window lets you pick up a standalone drug plan for the same effective date — so you won't be left without drug coverage. What you can't do is use this window to change drug plans while staying on Advantage. It also isn't available if you're in a Medical Savings Account plan, a Cost plan, or PACE. Changes take effect the first of the following month.

If you're brand new to Medicare and picked an Advantage plan right away, you get your own version of this window — it runs from the month your Part A and Part B start through the end of your third month.

Anytime — With Qualifying Event

Any Time of Year

Special Enrollment Period (SEP)

Triggered by a qualifying life event — job loss, move, retirement, plan termination, Medicaid eligibility change, and others. SEPs allow you to make changes outside of standard enrollment windows. Length varies by event — many run about two calendar months, but some are far shorter or longer. Check yours.

Important: Document Your Qualifying Event

When you use a Special Enrollment Period, you may be asked to provide proof of your qualifying event — such as a letter from your employer confirming loss of coverage, a moving document, or a Medicaid determination letter. Keep any paperwork related to your life change until your new Medicare coverage is confirmed active.

What's Actually Changeable

What You Can — and Cannot —
Change During a Plan
Change Window

Not everything is changeable in every enrollment window.
Here's a clear breakdown so you know exactly what your options are.

You CAN change:

✓

Switch from Original Medicare to Medicare Advantage

During AEP or a qualifying SEP, you can move from traditional Medicare to a bundled Advantage plan.

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Switch between Medicare Advantage plans

Move from one Advantage plan to another during AEP, OEP, or a qualifying SEP.

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Add, change, or drop a Part D drug plan

Change your prescription drug coverage during AEP or a qualifying SEP.

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Return to Original Medicare from Advantage

During AEP or OEP, you can leave Medicare Advantage and return to traditional Medicare.

⚠ What Cannot Be Changed Freely

Medicare Supplement (Medigap) plans operate differently from Medicare Advantage and Part D. Outside of your initial 6-month Medigap Open Enrollment Period (when you first turn 65 and enroll in Part B), insurers in most states can:

Deny your Medigap application based on health status
Charge you more due to pre-existing conditions
Apply waiting periods before covering certain conditions

This is one of the most consequential and least understood aspects of Medicare. If you are considering switching to or adding a Medigap policy, speaking with a licensed advisor first is strongly recommended.

Not Sure What You Qualify For?

A PharmSurance advisor can review your specific situation, confirm whether you qualify for an SEP, and help you find the plan that best fits your health and budget — before your window closes.

Talk to an Advisor →

Common Questions

Medicare Plan Change FAQ

The questions our advisors hear most often about changing Medicare plans.

Can I change my Medicare plan outside of open enrollment?

Yes — if you qualify for a Special Enrollment Period (SEP). SEPs are triggered by specific life events such as losing employer health coverage, moving outside your plan's service area, qualifying for Medicaid, or your plan leaving Medicare. SEP length varies by event. Many run for about two calendar months after the month the event happens, but some are shorter and some last much longer, so it is worth confirming the exact dates for your situation. See all enrollment windows →

How long do I have to change my Medicare plan after losing employer insurance?

You can act while you still have the employer coverage, and the window stays open until two months after the month that coverage ends. Worth separating two things that often get confused: the window to pick a Medicare Advantage or Part D plan is that two-month window, but the window to enroll in Part B itself without a late penalty is a full eight months after your employer coverage ends. Different clocks, same event. Missing the plan window means waiting for the Annual Enrollment Period (October 15–December 7), with coverage not starting until January 1.

Can I change my Medicare plan if I move to a new state?

Yes. Moving to a new address outside your Medicare Advantage or Part D plan's service area qualifies you for an SEP. If you notify your plan ahead of the move, the window opens the month before you go; otherwise it opens on the date you move. Either way it runs until two months after the month it opened or the month of your move, whichever is later. Even moving within the same county can qualify if your current plan doesn't cover your new area. Original Medicare (Parts A and B) has no network, so it's not affected by moves — but your Advantage or drug plan may be. See enrollment windows for moving →

What happens to my Medicare when I retire?

When you retire and lose your employer health coverage, you qualify for a Special Enrollment Period to enroll in or change your Medicare plan. If you were delaying Medicare Part B because of active employer coverage, you can now enroll without penalty during this SEP. Two clocks start when that coverage ends: roughly two months to choose a plan, and eight months to enroll in Part B without a permanent late penalty. Don't let the longer one lull you into missing the shorter one. A PharmSurance advisor can walk you through your specific options — especially important if your retirement coverage includes COBRA, which does not exempt you from Medicare enrollment requirements Read our Still Working at 65 guide →.

Can I change my Medicare drug plan (Part D) outside of open enrollment?

Generally, no — you can only change your standalone Part D drug plan during the Annual Enrollment Period (October 15–December 7) unless you qualify for a Special Enrollment Period. SEP triggers for Part D include moving, gaining or losing Medicaid/Extra Help, or your plan losing its Medicare contract. If your medications have changed significantly, speaking with an advisor about your options is worth the conversation. Read our drug coverage guide →

My Medicare plan is being discontinued. What do I do?

If your plan is leaving Medicare or no longer serving your area, you automatically qualify for a Special Enrollment Period to select a new plan. You should receive a notice from your plan. If you do nothing, Medicare will typically enroll you in Original Medicare, which may not include drug coverage. A PharmSurance advisor can help you find a replacement plan before your current coverage ends. Understand your enrollment options →

Is there a cost to work with a PharmSurance advisor on a plan change?

No — there is no cost to you for our service. PharmSurance advisors are compensated by the insurance carriers when you enroll in a plan. That compensation does not affect your plan's cost or benefits in any way. We are never paid by you, and we have no incentive to recommend one plan over another other than finding the one that genuinely fits your situation best.

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Worth Knowing

Why We Keep This Page General

Medicare rules require your advisor to confirm which types of Medicare products you'd like to discuss — Medicare Advantage, Part D, Medicare Supplement — before getting into plan-specific details with you. It's called a Scope of Appointment, and it exists to protect you, not slow things down. That's why you'll find general, educational information here rather than plan-specific numbers. A quick conversation with an advisor unlocks the real specifics, tailored to your situation.

📜 Learn More 🤝 Talk to an Advisor

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Official Government Resource

Want to Review the Full Picture First?

The official Medicare & You handbook, published annually by CMS, covers every part of Medicare in plain language — enrollment rules, plan types, and your rights as a beneficiary. Free to read, no account needed.

Read the Medicare & You Handbook →

When you're ready, a PharmSurance advisor will analyze your individual situation and help you understand your options clearly — something a general handbook can't do.

Think Your Situation
Has Changed?
Don't Wait for October.

Special Enrollment Period windows vary — many close about two months after the month your qualifying event happened, and a few work nothing like that. A conversation with a PharmSurance advisor can confirm which one applies to you and how long you actually have.