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Changing Medicare Plans After Open Enrollment: What Is Still Possible From December 8, 2026

Reviewed by Russell Noga, Licensed Medicare Insurance Broker (all 50 states) — Last updated November 10, 2026

Changing Medicare plans after open enrollment is possible in three ways: Medicare Advantage members get one switch from January 1 to March 31, 2027, a special enrollment period opens after events such as a move or lost coverage, and Medigap can be applied for in any month. People in Original Medicare with only a Part D plan generally need a special enrollment period to change drug plans before next fall.

2027 by the Numbers

Jan 1 – Mar 31

2027 Medicare Advantage open enrollment period, one change allowed (CMS)

Last day of Feb

deadline to choose a new plan when yours is not renewed for 2027 (Medicare)

1,965

special needs plans for 2027, 36% of individual Advantage plans (our analysis of CMS plan data)

The fall enrollment window closed on December 7, 2026, but the calendar does not freeze until next October. Which door is still open depends on two things: the kind of coverage you have now and whether something in your life has changed.

This guide walks through the months after the deadline in order, then lists the life events that create a mid-year window. If you are about to make a change on Medicare.gov, our walkthrough on how to change Medicare plans online shows each screen.

✔ Licensed in all 50 states
✔ Based on CMS 2027 data
✔ Free plan comparison

Key Highlights

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The January to March window is only for people already in a Medicare Advantage plan on January 1.

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If your plan is not renewed for 2027, you have until the last day of February to pick another.

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People with Medicaid or Extra Help can make certain changes once a month.

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Medigap has no enrollment season, but outside protected windows the insurer can review your health.

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December 8 to December 31, 2026: The Short Gap

Once the fall window closes, most people are locked into their 2027 choice until it begins. Two exceptions open the very next day.

Open from December 8: The 5-star special enrollment period lets you move once, between December 8, 2026 and November 30, 2027, into a plan rated 5 stars in your area. And if your plan’s contract was not renewed for 2027, you can choose a new plan through the last day of February 2027.

Five-star plans are not offered everywhere. Our page on 2027 Medicare Advantage star ratings explains how ratings are assigned.

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January 1 to March 31, 2027: One Advantage-Only Change

Allowed in this window

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Switch from one Medicare Advantage plan to another

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Drop Medicare Advantage and return to Original Medicare

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Add a stand-alone Part D plan when returning to Original Medicare

Not allowed in this window

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Joining Medicare Advantage from Original Medicare

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Switching stand-alone Part D plans while in Original Medicare

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Making a second Advantage change after using the first

A change made in this window starts on the first day of the month after the plan receives your request. Someone who switches on February 10, 2027 would begin the new plan on March 1. The rules are also summarized in our Medicare Advantage enrollment period guide.

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Life Events That Open a Window Any Month

What happened How long the window lasts Typical options
You moved out of your plan’s service area From the month before the move if you tell the plan early, until 2 full months after Join a plan in the new area or return to Original Medicare
You moved to an address with new plan options Same timing as a move out of the area Switch to a plan newly available to you
Employer or union coverage ended, including COBRA 2 full months after the month coverage ends Join a Medicare Advantage or Part D plan
You lost Medicaid 3 full months from losing eligibility or being notified, whichever is later Join, switch or drop a plan
You moved into or out of a nursing home While you live there and 2 full months after you leave Switch or drop a plan
Medicare ended your plan’s contract 1 month before until 2 full months after the contract ends Choose another plan
You have Medicaid or Extra Help Once per calendar month Leave Medicare Advantage for Original Medicare, or join or switch a stand-alone drug plan

Source: Medicare.gov special enrollment period rules. Plans may ask for proof of the event.

Our Analysis of CMS 2027 Plan Data: Where Special Needs Plans Fit

Several mid-year windows lead into special needs plans rather than general ones. Our analysis of CMS 2027 plan data shows how large that segment is nationwide.

1,050

dual-eligible special needs plans for people with Medicare and Medicaid

752

chronic-condition special needs plans, which people with a qualifying condition can join at any time

163

institutional special needs plans for nursing home residents

5,481

individual Medicare Advantage plans in total for 2027

People with full Medicaid can also move into certain integrated dual-eligible plans once a month. Most other Advantage members cannot switch plans mid-year without a qualifying event.

Medigap Runs on Its Own Calendar

Medicare Supplement insurance is not tied to the fall window or the January to March window. You can apply in any month, but timing still decides how the insurer treats your health history.

Medigap after open enrollment

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Outside protected windows, insurers in most states can ask health questions and decline or rate applications

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Federal guaranteed issue rights apply after events such as an Advantage plan leaving your area

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Connecticut and New York require insurers to accept people 65 and older in any month

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Birthday-rule states give current Medigap owners a yearly switch window

If you are weighing a move from an Advantage plan into Medigap, read can you change from Medicare Advantage to Medigap before you leave the plan.

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Paperwork That Supports a Mid-Year Change

1

Name the event Identify which special enrollment period fits, since the application asks for it.

2

Gather the date proof A lease, utility bill, employer letter or Medicaid notice showing when the change happened.

3

Check the deadline Count the full months from the event so you apply inside the window.

4

Compare plans for your new situation A new county or new Medicaid status changes which plans you can join.

5

Keep copies Save the confirmation and any letters in case the plan asks to verify eligibility.

When Coverage Starts and What It Costs to Wait

Situation Usual start of new coverage
Change in the January to March window First day of the following month
Monthly change for Medicaid or Extra Help First day of the following month
Plan not renewed, choice made in January Generally the first day of the following month
5-star switch Generally the first day of the following month

Confirm the effective date on your enrollment confirmation.

Drug penalty risk: Going 63 days or more without Part D or other creditable drug coverage can add a permanent late enrollment penalty. Line up drug coverage before ending an Advantage plan that includes it.

Bottom Line

The Bottom Line

Changing Medicare plans after open enrollment depends on what you have and what has changed. Advantage members get one switch through March 31, 2027, life events open special windows, and Medigap can be applied for any month, subject to your state’s underwriting rules.

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Frequently Asked Questions

➤ I missed December 7. Can I switch to a cheaper Part D plan in January?

Only if you qualify for a special enrollment period, such as having Extra Help. The January to March window is for Medicare Advantage members, not people with Original Medicare and a stand-alone drug plan.

➤ My plan is not renewing for 2027. How long do I have to choose another?

You have a special enrollment period from December 8, 2026 through the last day of February 2027. If you do nothing, you return to Original Medicare and may need a drug plan.

➤ Does moving within the same county give me a special enrollment period?

Only if your new address offers plan options you did not have before. A move that leaves your choices unchanged does not create a window.

➤ Can I use the January to March window if I joined Medicare Advantage this fall?

Yes. Anyone enrolled in a Medicare Advantage plan on January 1, 2027 can make one change by March 31, 2027.

➤ My employer coverage ends in June 2027. When can I join a plan?

You have 2 full months after the month your coverage ends, which would run through August 31, 2027 in that example.

➤ Does every area have a 5-star plan to switch into?

No. Many counties have no 5-star Medicare Advantage or Part D plan, and the special enrollment period only helps where one is offered.

➤ Can the monthly Medicaid and Extra Help change move me into a different Advantage plan?

Generally no. It allows a move to Original Medicare or a stand-alone drug plan, though people with full Medicaid can join certain integrated dual-eligible plans.

➤ Is there a penalty just for changing plans after open enrollment?

No. Making a permitted change carries no penalty. The risk is going 63 days or more without creditable drug coverage, which can trigger the Part D late enrollment penalty.

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This website and MedicarePlansGuide.org are privately owned and operated and are not affiliated with, endorsed by, or connected to the Federal Medicare program or any other government agency. We do not offer every plan available in your area. Currently we represent multiple organizations which offer Medicare Advantage, Medicare Supplement Insurance plans, and Medicare Prescription Drug plans. Not all plans offer all benefits mentioned. Benefits, premiums, deductibles, copayments, coinsurance, exclusions, and limitations may vary by plan, carrier, and location and may change over time.

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For complete and official information about Medicare benefits and coverage options, visit Medicare.gov or call 1-800-MEDICARE (TTY users: 1-877-486-2048), 24 hours a day, 7 days a week.

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