Medicare Open Enrollment begins October 15 and runs through December 7. During this period, you can generally join, drop or switch Medicare Advantage plans, switch between Original Medicare and Medicare Advantage, and join, drop or switch Medicare Part D drug plans when the applicable requirements are met. Changes made during this period generally take effect January 1, 2027. Medicare

But here’s the part many beneficiaries misunderstand:

Medicare Open Enrollment does not give everyone an automatic right to switch Medicare Supplement (Medigap) policies.

Medigap has separate enrollment and switching rules. In most cases, federal law doesn’t guarantee your right to switch Medigap policies unless you’re in your six-month Medigap Open Enrollment Period or qualify for a specific guaranteed-issue protection. State law can provide additional rights. Medicare

So before changing anything for 2027, ask:

“Does the October 15–December 7 enrollment period actually apply to the coverage I want to change?”

Need help reviewing your 2027 options? Call Medicare Plan Assistance at (561) 808-9410. We can help you understand what you can change, what requires additional consideration, and what options are available where you live.

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Medicare Open Enrollment 2027: The Three Dates to Remember

Date	What Happens
October 15, 2026	Medicare Open Enrollment begins
December 7, 2026	Medicare Open Enrollment ends
January 1, 2027	AEP-elected coverage generally takes effect

Medicare’s 2026 Medicare & You handbook specifically identifies October 15–December 7, 2026 as Open Enrollment for 2027 coverage and says beneficiaries can change Medicare health or drug coverage during this period. Medicare

Our Medicare Open Enrollment guide explains the enrollment period in greater detail.

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What CAN You Change During Medicare Open Enrollment?

Here’s the simple version.

✓ Medicare Advantage → Another Medicare Advantage Plan

If you’re currently enrolled in Medicare Advantage, you can switch to another Medicare Advantage plan available to you.

That might mean:

HMO → HMO

HMO → PPO

PPO → HMO

PPO → PPO

or another eligible Medicare Advantage option.

But changing plans can also change your:

• Provider network
• Prescription formulary
• Pharmacy arrangements
• Copayments
• Coinsurance
• MOOP
• Prior authorization requirements
• Supplemental benefits

So don’t think of this as merely changing insurance-company logos.

You’re changing an entire healthcare plan.

Use our Medicare Advantage Plans guide before making that decision.

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✓ Original Medicare → Medicare Advantage

You can generally use Medicare Open Enrollment to move from Original Medicare to Medicare Advantage if you meet the plan’s eligibility requirements. Medicare

To enroll in Medicare Advantage, you generally need both Medicare Part A and Part B. Medicare

Before switching, understand that these are fundamentally different ways of receiving Medicare benefits.

Original Medicare and Medicare Advantage can differ in areas such as:

Provider access

Plan networks

Prior authorization

Cost structure

Prescription coverage

Supplemental benefits

Our Compare Medicare Plans page is a good starting point if you’re deciding between the two.

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✓ Medicare Advantage → Original Medicare

You can also leave Medicare Advantage and return to Original Medicare during Open Enrollment. Medicare

But don’t stop your planning there.

You should also consider:

Prescription coverage

Original Medicare doesn’t generally include outpatient prescription drug coverage. You may need a separate Part D plan.

Medigap

You might want Medicare Supplement insurance to help with some of Original Medicare’s out-of-pocket costs.

But this is where one of the biggest Open Enrollment misconceptions appears:

Leaving Medicare Advantage does not automatically guarantee that you can buy any Medigap policy you want.

Your ability to obtain Medigap can depend on your Medigap Open Enrollment Period, guaranteed-issue rights, trial rights, state law and other circumstances. Outside protected situations, medical underwriting may be permitted. Medicare

Before leaving Medicare Advantage because you want Original Medicare + Medigap, investigate your Medigap eligibility first.

That sequence can matter enormously.

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✓ Part D → Another Part D Plan

If you have Original Medicare and a stand-alone Part D prescription drug plan, you can switch to another Medicare drug plan during Open Enrollment. Medicare

For 2027, compare your actual prescriptions.

Don’t choose based only on:

“Which Part D plan has the lowest premium?”

Compare:

Drug coverage

Tier placement

Deductible

Copays/coinsurance

Preferred pharmacies

Prior authorization

Step therapy

Quantity limits

Total estimated annual drug costs

Our Medicare Part D Prescription Drug Plans guide explains what to review.

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✓ Join a Part D Plan

If you have Original Medicare and are eligible, Open Enrollment can generally be used to join a Medicare drug plan. Medicare

However, waiting too long to obtain drug coverage can have consequences.

Medicare says that if you go 63 days or more in a row without Medicare drug coverage or other creditable prescription drug coverage after the applicable eligibility period, you may have to wait for an enrollment period and could owe a Part D late-enrollment penalty. Medicare

So dropping or going without prescription coverage deserves careful consideration.

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✓ Drop a Part D Plan

Open Enrollment can also allow you to drop stand-alone Medicare drug coverage. Medicare says a Part D disenrollment during the October 15–December 7 period takes effect January 1. Medicare

But ask yourself:

“Will I have other creditable prescription drug coverage?”

Dropping Part D without understanding the consequences can create a future coverage gap and potential penalty.

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Before You Change Anything, Identify What You’re Actually Changing

Are you changing:

Medicare Advantage?

Part D?

Original Medicare?

Medigap?

Those aren’t governed by exactly the same rules.

Before making a 2027 coverage decision, call Medicare Plan Assistance at (561) 808-9410.

We’ll help you separate the enrollment-period rules from the actual plan comparison.

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What CAN’T You Automatically Change During Medicare Open Enrollment?

This section is just as important.

✗ AEP Doesn’t Automatically Give You a New Medigap Open Enrollment Period

October 15 doesn’t create a nationwide annual Medigap enrollment window.

Your federal Medigap Open Enrollment Period generally lasts six months beginning when you’re 65 or older and have Medicare Part B.

Outside that period, Medicare says you may face fewer choices, higher premiums based on underwriting where permitted, or denial of an application unless you have an applicable guaranteed-issue protection. Medicare

So:

Medicare Open Enrollment ≠ Medigap Open Enrollment

The names sound similar.

The rules are very different.

Read our Medicare Supplement Plans guide before assuming October 15 gives you a guaranteed opportunity to change Medigap companies.

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✗ You Can’t Assume You Can Leave Medicare Advantage and Automatically Get Medigap

This deserves its own warning.

Imagine someone currently has Medicare Advantage.

They decide:

“It’s Open Enrollment. I’ll go back to Original Medicare and buy Plan G.”

Returning to Original Medicare may be permitted during AEP.

But getting the desired Medigap policy is a separate question.

In most cases, Medicare says federal law doesn’t give you an automatic right to switch or obtain Medigap outside your Medigap Open Enrollment Period unless a guaranteed-issue or other protected situation applies. Medicare

There are important exceptions.

For example, certain trial rights can provide Medigap protections when someone tries Medicare Advantage and returns to Original Medicare within the applicable period. Medicare

Don’t assume.

Verify first.

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✗ Open Enrollment Doesn’t Mean You Have to Change Plans

Another misconception:

“It’s Open Enrollment, so I need to enroll again.”

Not necessarily.

Open Enrollment is an opportunity to review your Medicare health and drug coverage and make an eligible change if you decide to. Medicare’s own 2026 handbook uses that exact framing for the 2027 enrollment period. Medicare

Your goal isn’t:

FIND A NEW PLAN

Your goal is:

VERIFY THAT YOUR CURRENT COVERAGE STILL FITS

If it does, staying may be reasonable.

If it doesn’t, compare alternatives.

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✗ October 15 Isn’t the Deadline

Tomorrow is the beginning of Medicare Open Enrollment.

It isn’t the end.

You have from:

OCTOBER 15 → DECEMBER 7

to make eligible AEP changes for 2027. Medicare

Don’t let someone pressure you with:

“You have to enroll tomorrow.”

or

“This is your last chance.”

October 15 is the first day of AEP, not the last.

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✗ Medicare Open Enrollment Isn’t the Same as Your Initial Enrollment Period

If you’re turning 65, don’t assume that the October 15–December 7 period replaces your personal Medicare enrollment timeline.

Your Initial Enrollment Period is associated with first becoming eligible for Medicare.

The annual October 15–December 7 Open Enrollment Period is primarily for making eligible changes to Medicare Advantage and drug coverage. Medicare

So someone turning 65 in November may be dealing with:

Their Initial Enrollment Period

and

Medicare Open Enrollment

at the same time.

Those enrollment periods serve different purposes.

If you’re approaching Medicare eligibility, start with our Turning 65 & Medicare Initial Enrollment guide.

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What Happens to Your Old Plan When You Switch?

This is another source of confusion.

If you’re switching drug coverage by enrolling in a new Medicare drug plan during an appropriate enrollment period, Medicare explains that your old drug coverage ends when the new coverage begins. You generally don’t need to separately cancel the old drug plan. Medicare

For AEP changes, the new coverage generally begins:

JANUARY 1, 2027

provided the applicable enrollment request is received by December 7. Medicare

Be careful about manually cancelling existing coverage.

Understand how your new enrollment affects the old coverage before taking additional action.

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What About the Medicare Advantage Open Enrollment Period?

There’s another similarly named enrollment period:

Medicare Advantage Open Enrollment Period

It runs from:

January 1 through March 31

for people already enrolled in Medicare Advantage.

During that period, someone already in Medicare Advantage can generally make one change:

Medicare Advantage → Different Medicare Advantage plan

or

Medicare Advantage → Original Medicare, with an opportunity to join a separate drug plan. Medicare

But during the January 1–March 31 MA Open Enrollment Period, someone in Original Medicare can’t use that period to join Medicare Advantage or switch stand-alone Part D plans. Medicare

That’s another reason terminology matters.

Annual Medicare Open Enrollment:
October 15–December 7

Medicare Advantage Open Enrollment:
January 1–March 31 for people already in Medicare Advantage

They aren’t interchangeable.

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Medicare Open Enrollment: Can I Change This?

Coverage Change	During Oct. 15–Dec. 7 AEP?
Medicare Advantage → Medicare Advantage	Yes
Original Medicare → Medicare Advantage	Yes, if eligible
Medicare Advantage → Original Medicare	Yes
Part D → Different Part D	Yes, if applicable
Join Part D	Yes, if eligible/applicable
Drop Part D	Yes
Automatically switch Medigap without underwriting	No
Guaranteed right to buy any Medigap policy	No
First enroll in Part A/B simply because AEP began	Not what AEP is for
Change Marketplace coverage because Medicare AEP began	No—separate system

Medicare explicitly distinguishes Medicare Open Enrollment from the Health Insurance Marketplace’s enrollment process. Medicare

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Before You Switch From Medicare Advantage to Original Medicare

Use this checklist.

☐ Can I obtain the Medigap coverage I want?

If Medigap is part of your strategy, determine this before assuming you’ll have supplemental coverage.

☐ What will I do for prescriptions?

You may need separate Part D coverage.

☐ What would Original Medicare leave me responsible for?

Understand deductibles and coinsurance.

☐ Do I have a guaranteed-issue or trial right?

Your circumstances matter.

☐ When will everything become effective?

Avoid unintended coverage gaps.

This is one of the situations where the enrollment decision and insurance strategy need to be considered together.

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Before Switching Medicare Advantage Plans

Ask:

Are my doctors in-network for the exact 2027 plan?

Are my hospitals in-network?

Are my prescriptions covered?

What are my expected drug costs?

What are the PCP and specialist costs?

What will hospital care cost?

What’s the MOOP?

HMO, PPO or HMO-POS?

Which services require prior authorization?

Which supplemental benefits would I actually use?

Then compare.

Our HMO vs PPO vs HMO-POS Medicare Advantage guide explains why the network structure itself can materially change how you receive care.

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Medicare Open Enrollment in Florida: The Rules Are Federal, but Your Plans Are Local

The October 15–December 7 Medicare Open Enrollment window applies nationally.

But the plans you compare aren’t necessarily the same everywhere.

Someone searching in:

Delray Beach

Boca Raton

Boynton Beach

West Palm Beach

Palm Beach County

Pompano Beach

Fort Lauderdale

Broward County

Miami

Miami-Dade County

may have a different set of Medicare Advantage and Part D plans available.

That’s why:

“My friend has a great Medicare plan.”

isn’t enough information.

The plan needs to be:

Available to you

Appropriate for your doctors

Appropriate for your prescriptions

Appropriate for your healthcare needs

Appropriate for your budget

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5 Medicare Open Enrollment Misconceptions

Myth #1: “I have to change plans every year.”

No. Review first. Change only when another available option better fits your needs.

Myth #2: “October 15 is my deadline.”

No. It’s the first day of AEP. December 7 is the end of the annual Open Enrollment Period. Medicare

Myth #3: “AEP means I can switch Medigap plans without underwriting.”

Not necessarily. Medigap follows separate federal and state rules. Medicare

Myth #4: “If I leave Medicare Advantage, I automatically get Plan G.”

No. Returning to Original Medicare and qualifying to purchase a particular Medigap policy are separate issues.

Myth #5: “Open Enrollment is when everyone signs up for Medicare for the first time.”

No. First-time Medicare enrollment generally involves your Initial Enrollment Period or another applicable Part A/Part B enrollment period.

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The Rule to Remember Tomorrow

When Medicare Open Enrollment begins, don’t start by asking:

“What can I switch to?”

Start with:

“WHAT COVERAGE DO I HAVE, WHAT DO I WANT TO CHANGE, AND WHICH ENROLLMENT RULE APPLIES?”

Then compare the actual options.

That one question can prevent a lot of Medicare enrollment confusion.

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Know What You Can Change Before You Change It

Starting October 15, you may have important choices involving:

Medicare Advantage

Part D

Original Medicare

But Medicare Supplement insurance has separate enrollment and switching rules.

Before making a 2027 change:

Verify the enrollment period.

Verify your eligibility.

Verify the replacement coverage.

Then enroll.

Call Medicare Plan Assistance at (561) 808-9410

We can help you review your current coverage and compare available 2027 Medicare options.

Local Help. Clear Answers. Better Decisions.

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Frequently Asked Questions

What can I change during Medicare Open Enrollment?

During October 15–December 7, you can generally join, drop or switch Medicare Advantage plans, move between Original Medicare and Medicare Advantage, and join, drop or switch Medicare Part D plans when applicable. Medicare

When does Medicare Open Enrollment start for 2027?

Medicare Open Enrollment for 2027 coverage begins October 15, 2026 and ends December 7, 2026. Medicare

When do changes made during Medicare Open Enrollment take effect?

Changes made during the October 15–December 7 period generally take effect January 1, 2027, provided the plan receives the applicable enrollment request by December 7. Medicare

Can I switch Medicare Supplement plans during Medicare Open Enrollment?

You can apply to change Medigap policies, but the October 15–December 7 Medicare Open Enrollment Period doesn’t automatically give you federal guaranteed-issue rights or create a new Medigap Open Enrollment Period. Underwriting may apply depending on your circumstances and state law. Medicare

Can I switch from Medicare Advantage to Original Medicare during Open Enrollment?

Yes. Medicare Open Enrollment allows you to switch from Medicare Advantage to Original Medicare. If you want Medigap after returning to Original Medicare, determine separately whether you have the right or ability to obtain the Medigap policy you want. Medicare

Do I have to change Medicare plans during Open Enrollment?

No. Open Enrollment gives you an opportunity to review and change coverage. You don’t need to change plans simply because the enrollment period begins. Medicare

Is Medicare Open Enrollment the same as the Medicare Advantage Open Enrollment Period?

No. Annual Medicare Open Enrollment runs October 15–December 7. The Medicare Advantage Open Enrollment Period runs January 1–March 31 for people already enrolled in Medicare Advantage and permits a more limited set of changes. Medicare

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Related Medicare Guides

Medicare Open Enrollment — Review the October 15–December 7 enrollment period and your 2027 options.

Medicare Open Enrollment Checklist 2027 — Get your information organized before comparing plans.

Medicare Advantage Plans — Understand Medicare Advantage before joining or switching plans.

Medicare Part D Prescription Drug Plans — Review stand-alone prescription drug coverage.

Medicare Supplement Plans — Understand why Medigap enrollment and switching rules are separate from AEP.

Compare Medicare Plans — Compare the broader Medicare coverage structures before making a change.