Switching From Medicare Advantage to Medigap: What You Need to Know Before You Change

If you’re wondering whether you can switch from Medicare Advantage to Medigap, you’re not alone. Many people reach a point where they’d prefer the flexibility and predictable costs of Original Medicare plus a Medigap (Medicare Supplement) plan instead of a Medicare Advantage plan.

You can often switch—but there are important rules, timelines, and potential roadblocks that can affect whether you’re accepted into a Medigap plan and how much you’ll pay.

This guide walks you through:

When you can leave Medicare Advantage
Whether you’re guaranteed the right to buy a Medigap plan
How medical underwriting can affect you
Special situations that give you extra protections
Practical steps to make the switch smoothly

Medicare Advantage vs. Medigap: Why Switching Matters

Before getting into the “how,” it helps to understand what you’re switching from and to.

What You Have Now: Medicare Advantage (Part C)

A Medicare Advantage plan:

Is offered by private insurance companies
Replaces your Original Medicare coverage (you still stay enrolled in Parts A and B, but you use the plan’s rules and network)
Often includes extra benefits, like vision or dental, and usually prescription drug coverage (Part D)
Typically uses provider networks (HMO, PPO, etc.)
Has an annual out-of-pocket maximum for covered services

Many people later discover that:

Their doctors are out of network
Referrals and authorizations feel restrictive
Out-of-pocket costs for frequent or complex care are higher than expected

These are common reasons people look at Medigap as an alternative.

What You’re Considering: Medigap (Medicare Supplement)

A Medigap plan:

Works only with Original Medicare (Parts A and B)
Helps pay some of the costs Original Medicare does not cover, such as deductibles, copays, and coinsurance
Usually does not include prescription drug coverage—you’d typically add a separate Part D plan
Generally does not use a network; you can often see any provider that accepts Medicare
Has a monthly premium, but can reduce what you pay when you use care

Key difference:
Medicare Advantage replaces how you get your Medicare benefits.
Medigap supplements Original Medicare.

Switching from Medicare Advantage to Medigap usually means:

Leaving your Medicare Advantage plan
Going back to Original Medicare
Applying for a Medigap policy
(Usually) enrolling in a standalone Part D drug plan

Can You Switch From Medicare Advantage to Medigap at Any Time?

You can leave a Medicare Advantage plan only during certain times of the year, except in special circumstances.

Main Times You Can Leave Medicare Advantage

Medicare Open Enrollment Period
- When: Every year from October 15 to December 7
- What you can do: Switch from a Medicare Advantage plan to Original Medicare, with or without adding a Part D plan
- Coverage start date: January 1 of the following year
Medicare Advantage Open Enrollment Period
- When: Every year from January 1 to March 31
- What you can do:
  - Switch from one Medicare Advantage plan to another or
  - Leave Medicare Advantage and go back to Original Medicare (and you can join a Part D plan)
- Coverage start date: Usually the first of the month after your plan gets your request
Special Enrollment Periods (SEPs)
You might qualify for a Special Enrollment Period to switch if certain things change, such as:
- You move out of your plan’s service area
- Your Medicare Advantage plan leaves Medicare or ends coverage in your area
- You lose certain other coverage

These let you return to Original Medicare, but they do not always guarantee that you can buy a Medigap plan without health questions.

The Key Issue: Are You Guaranteed to Get a Medigap Plan?

This is where things get more complicated.

Unlike Medicare Advantage, Medigap insurers in many states are allowed to use medical underwriting when you apply outside of certain protected periods.

That means they may:

Ask health-related questions
Review your medical history
Potentially charge more, limit coverage, or even decline your application

Whether you can freely switch from Medicare Advantage to Medigap depends largely on whether you have a “guaranteed issue” right.

When You Have Guaranteed Issue Rights

In specific situations, you have a right to buy certain Medigap plans:

The insurance company must sell you a policy
It cannot charge you more because of your health
It cannot make you wait for coverage of preexisting conditions (in most common cases, as long as you had prior continuous coverage)

Common scenarios where this may apply:

Your Medicare Advantage plan leaves Medicare or stops offering coverage in your area
You move out of your plan’s service area
You joined a Medicare Advantage plan when you first became eligible for Medicare at 65, and it’s within the first 12 months of joining
- This is sometimes called a “trial right”
In some situations where your other coverage (like employer group coverage) ends

In these cases, you generally get a limited window (often 63 days) to buy a Medigap plan starting when your other coverage ends.

⚠️ Important:

Guaranteed issue rights usually apply only to certain Medigap plan types, not always all of them.
Rules can vary by state, and some states offer broader protections.

When You Don’t Have Guaranteed Issue Rights

If you decide to leave Medicare Advantage just because you prefer Medigap, and you’re not in a protected situation, you can still:

Switch from Medicare Advantage to Original Medicare during one of the allowed times
Apply for a Medigap policy

But:

The Medigap company will usually require medical underwriting
It may approve, deny, or rate (charge more for) your policy based on your health

This is the part that surprises many people:

You can successfully leave your Medicare Advantage plan but not be accepted into a Medigap plan you want, or you may face higher premiums if you have health issues.

Step-by-Step: How to Switch From Medicare Advantage to Medigap

If you’re thinking seriously about switching, try to take these steps in order so you don’t accidentally lose coverage.

1. Confirm Your Eligibility Windows

Identify when you can leave your Medicare Advantage plan:

Are you within Oct 15 – Dec 7 (Open Enrollment)?
Are you within Jan 1 – Mar 31 (Medicare Advantage Open Enrollment)?
Do you qualify for a Special Enrollment Period because of a move or plan change?

This determines when you can move back to Original Medicare.

2. Check Whether You Have a Guaranteed Issue Right

Look at your personal situation:

Did you join Medicare Advantage when you first became eligible for Medicare and are still in your first 12 months?
Is your Medicare Advantage plan ending or leaving your area?
Did you move out of your plan’s service area?

If yes to certain conditions, you may have a stronger right to get a Medigap policy without medical underwriting.

If no, you may be subject to underwriting—so it’s crucial to apply for Medigap before you drop your current plan whenever possible.

3. Shop for Medigap Plans in Your Area

Key points to compare:

Plan type (e.g., Plan G, Plan N, etc., depending on what’s available and your Medicare eligibility date)
Monthly premiums
How the plan handles cost-sharing (deductibles, copays, coinsurance)
The insurance company’s pricing method (issue-age, attained-age, or community-rated, if available in your state)

Remember that Medigap plans are standardized by letter in most states: a Plan G from one insurer covers the same basic benefits as a Plan G from another, though the price and service may differ.

4. Apply for a Medigap Plan First (When Possible)

If you’re not in a guaranteed issue window:

Apply for the Medigap plan before you cancel or leave your Medicare Advantage plan, if your situation allows
Wait for approval from the Medigap insurer
Once you know you’re accepted and have an effective date, then proceed with leaving your Medicare Advantage plan

This can reduce the risk of ending up with Original Medicare only, without any Medigap coverage, if your application is denied.

5. Plan for Prescription Drug Coverage

Medigap plans do not include prescription drug coverage.

If you move from Medicare Advantage to Original Medicare + Medigap, you’ll likely need to:

Enroll in a separate Part D plan
Do this during the same enrollment window (Open Enrollment, MA Open Enrollment, or a Special Enrollment Period)

Missing your Part D window can lead to:

Time without prescription coverage
Potential late enrollment penalties later on

Common Scenarios: Can You Switch?

Here’s a simplified overview of typical situations and what they usually mean:

Situation	Can You Leave Medicare Advantage?	Can You Get Medigap Without Underwriting?	Key Considerations
You’re in the first 12 months of your first-ever Medicare Advantage plan at 65	Yes, during a “trial right”	Often yes, with guaranteed issue for certain plans	Must act within the protected timeframe
Your MA plan is leaving your area or ending	Yes, via Special Enrollment Period	Often yes, with guaranteed issue for certain plans	Short window to enroll in Medigap
You moved out of your MA plan’s service area	Yes, via Special Enrollment Period	Often yes, with guaranteed issue in many cases	Check timing and eligible Medigap types
You simply prefer Medigap now, no special change	Yes, during allowed enrollment periods	Usually no guaranteed issue; underwriting likely	Apply for Medigap before dropping MA when possible
You have significant ongoing health issues and want Medigap’s extra coverage	Yes, during allowed periods	Underwriting may result in higher premiums or a denial if you lack guaranteed rights	Consider your risk if not approved

Because rules vary by state and by insurer, it often helps to speak with a licensed, independent Medicare-focused professional or your State Health Insurance Assistance Program (SHIP) for personalized guidance.

State Differences: Why Your Location Matters

Medigap rules are not identical in every state. Some states:

Offer year-round open enrollment into Medigap with limited or no underwriting for certain age groups
Provide more frequent or broader guaranteed issue rights
Have unique plan naming or standardized benefits

Others follow more basic federal standards, with fewer protected windows and more reliance on underwriting once your initial Medigap enrollment period has passed.

Because of this, what’s possible in one state might be much harder in another. It’s worth checking your state-specific rules before making any decision.

Pros and Cons of Switching From Medicare Advantage to Medigap

Potential Advantages of Moving to Medigap

Many people value that with Original Medicare + Medigap:

You often have broader provider choice, as long as providers accept Medicare
You may have more predictable out-of-pocket costs when you use services
There is usually no requirement for referrals to see specialists
Medigap can help limit the financial impact of frequent or high-cost medical care

Potential Drawbacks or Challenges

On the other hand:

Premiums for Medigap + Part D can be higher than some Medicare Advantage plans
You may not be guaranteed acceptance into a Medigap plan if you have health issues and are outside protected periods
You might lose certain extra benefits that your Medicare Advantage plan included (such as some dental, vision, or hearing benefits)
You will need to manage separate coverage pieces: Original Medicare, Medigap, and a Part D plan

Practical Tips Before You Decide to Switch

To protect yourself and avoid gaps in coverage:

Confirm your timeline
- Know exactly which enrollment period you’re in and when it ends.
Check your rights
- Determine whether you have a trial right or other guaranteed issue protection.
Get quotes and answers in writing
- Ask Medigap insurers about underwriting, premiums, and effective dates.
Do not cancel your current plan until you’re sure
- Wherever possible, wait to leave your Medicare Advantage plan until you know your Medigap application is approved and when it starts.
Coordinate your Part D plan
- Line up your prescription coverage to start at the same time as your new setup.
Keep notes 📒
- Document conversations, dates, and decisions; this can be helpful if there’s confusion later.

Bottom Line: Yes, You Can Often Switch—but the Details Are Critical

You can usually switch from Medicare Advantage back to Original Medicare during approved enrollment periods, and in many situations you can then apply for a Medigap (Medicare Supplement) plan.

However:

You are not always guaranteed a Medigap policy when you switch.
Your ability to get Medigap without medical underwriting often depends on whether you’re in a protected window (like your first year in Medicare Advantage at 65, or when your plan ends or you move).
Outside those windows, Medigap insurers in many states can use medical underwriting, which may affect your eligibility and premiums.

Because the rules are detailed and can vary by state, many consumers find it helpful to:

Review their options carefully
Clarify their rights and timelines
Get personalized help from a licensed Medicare professional or a state counseling program

Understanding these steps and limitations lets you make a more informed decision about whether switching from Medicare Advantage to Medigap is the right move for your situation.