Switching from Medicare Advantage to Medigap Guide (2027)

If you are frustrated by network restrictions or surprise medical bills, you might be thinking about switching from Medicare Advantage to Medigap. Every year, thousands of seniors try to leave their Medicare Advantage plans to get the freedom and predictable costs of Original Medicare paired with a Medigap policy.

However, making this switch is rarely as simple as clicking a button on a website. Unlike Medicare Advantage, Medigap plans are not always required to accept you. If you miss your initial enrollment windows, you could be subjected to strict health questions—a process known as medical underwriting. If you have preexisting conditions, an insurance company can charge you a massive premium or deny your application entirely.

This guide demystifies the rules for 2026 and 2027. We will explain exactly when you can switch, how to navigate the medical underwriting trap, and the step-by-step process to transition your coverage safely without experiencing a gap in your healthcare.

Can You Switch from Medicare Advantage Back to Medigap?

The short answer is yes, you can leave a Medicare Advantage plan and return to Original Medicare (Part A and Part B). Once you are back on Original Medicare, you can apply for a Medigap (Medicare Supplement) policy to help pay for your deductibles and copayments.

But there is a catch. Leaving Medicare Advantage is easy; getting approved for a Medigap plan is the hard part. Federal law only guarantees your right to buy a Medigap policy during specific, limited timeframes.

If you apply for Medigap outside of these protected windows, the insurance company is allowed to look at your medical history. They can ask about your past surgeries, your current medications, and any chronic conditions you have. Based on those answers, they can refuse to sell you a policy.

To switch successfully, you need to know exactly which enrollment periods apply to your situation. You also need to follow a strict order of operations: never drop your current coverage until you have an approval letter in hand for your new coverage. You can read more about your options in our Medicare Advantage guides.

The Medical Underwriting Trap: What Happens When You Apply Later

Medical underwriting is the biggest hurdle for seniors who want to leave Medicare Advantage. When you apply for a Medigap plan without a "guaranteed issue" right, the application will include a long list of health questions.

The insurance company will review your medical records to assess how much you might cost them in the future. They are looking for red flags. Conditions that frequently trigger a denial include:

• Recent heart attacks or strokes
• Cancer diagnoses (or currently undergoing treatments like chemotherapy)
• Diabetes with complications (such as neuropathy or retinopathy)
• Kidney disease or kidney failure
• Degenerative bone diseases

Real-World Scenario: The Underwriting Trap

Imagine a 72-year-old named Robert. When he turned 65, he joined a Medicare Advantage plan because it offered a $0 premium. For seven years, he was healthy and happy with his choice.

At age 72, Robert is diagnosed with cancer. He discovers that the top cancer specialists in his state do not accept his Medicare Advantage HMO network. He decides he wants to switch to Original Medicare and buy a Medigap policy so he can see any doctor in the country who accepts Medicare.

Because Robert is past his initial enrollment windows, he must go through medical underwriting. The Medigap insurance companies see his cancer diagnosis and deny his application. Robert is now stuck in his Medicare Advantage plan. He can drop it and return to Original Medicare, but without a Medigap plan, he would be responsible for 20% of the cost of his expensive cancer treatments, with no annual limit on his spending.

This is why understanding your protected enrollment windows is absolutely critical.

How Your Medigap Open Enrollment Period Works

Your best chance to buy a Medigap policy is during your Medigap Open Enrollment Period. This is a one-time, six-month window that begins on the first day of the month you turn 65 and are enrolled in Medicare Part B.

During this exact six-month window, you have a federal guaranteed issue right. This means:

• Insurance companies cannot deny you a Medigap policy.
• They cannot charge you a higher premium because of your health history.
• They cannot make you wait for coverage to start for pre-existing conditions.

If you chose a Medicare Advantage plan when you turned 65, your six-month Medigap Open Enrollment Period came and went. Once it expires, it is gone forever in most states. You cannot get it back just because you are unhappy with your Medicare Advantage plan years later.

Trial Rights: The 12-Month Rule for Switching Safely

Medicare understands that people sometimes make mistakes when choosing their coverage. To protect you, federal rules provide a "trial right." This gives you a 12-month window to test out Medicare Advantage and change your mind without facing medical underwriting.

There are two specific situations where you have a trial right:

Scenario 1: You Joined Medicare Advantage at Age 65

If you joined a Medicare Advantage plan during your Initial Enrollment Period when you first turned 65, you have 12 months to change your mind. If you decide Medicare Advantage is not for you within that first year, you can drop the plan, return to Original Medicare, and buy any Medigap policy sold in your state with no health questions asked.

Scenario 2: You Dropped Medigap for Medicare Advantage

If you already had a Medigap policy, dropped it, and joined a Medicare Advantage plan for the very first time, you also get a 12-month trial right. If you decide you do not like the Medicare Advantage plan within that first year, you can switch back.

However, the rules here are slightly stricter. You are only guaranteed the right to buy back the exact same Medigap policy from the exact same company you had before. If that specific policy is no longer available, you can buy a Medigap Plan A, B, C, F, K, or L that is sold in your state. (Note: Plans C and F are only available if you were eligible for Medicare before January 1, 2020).

State-Specific Rules That Let You Skip Medical Underwriting

If you do not have a federal trial right, all hope is not lost. Health insurance is regulated at the state level, and several states have passed laws that give residents extra opportunities to buy or switch Medigap plans without answering health questions.

If you live in one of these states, switching from Medicare Advantage to Medigap is much easier:

• New York: New York has continuous open enrollment. You can apply for a Medigap policy at any time of the year, and insurers cannot deny you or charge you more based on your health.
• Connecticut: Similar to New York, Connecticut offers year-round guaranteed issue rights for Medigap plans.
• Massachusetts: Massachusetts requires insurers to offer a continuous open enrollment period starting in February and ending in March every year.
• Maine: Maine requires insurers to designate one month each year where residents can buy a Medigap policy without medical underwriting.

Additionally, states like California, Oregon, Idaho, and Illinois have "Birthday Rules." These rules typically allow you to switch from one Medigap plan to another around your birthday without underwriting. However, birthday rules generally apply to people who already have a Medigap plan, not people trying to switch from Medicare Advantage.

Always check with your state's Department of Insurance to see if you have special protections that allow you to switch Medigap during open enrollment windows specific to your location.

Using the Medicare Advantage Open Enrollment Window (January 1 to March 31)

If you are currently enrolled in a Medicare Advantage plan, you have a specific window early in the year to make changes. The Medicare Advantage Open Enrollment Period runs from January 1 through March 31 every year.

During this three-month window, you are allowed to make one change to your coverage:

• You can switch from your current Medicare Advantage plan to a different Medicare Advantage plan.
• You can drop your Medicare Advantage plan, return to Original Medicare, and add a standalone Part D prescription drug plan.

This is the perfect time of year to initiate your switch back to Medigap. However, remember that this window only dictates when you can leave your Medicare Advantage plan. It does not give you a guaranteed issue right to buy a Medigap policy.

If you use this window to drop your Advantage plan, you still have to pass medical underwriting for Medigap unless you have a trial right or live in a state with special rules.

The 63-Day Rule: If Your Medicare Advantage Plan Drops You

Sometimes, the decision to leave a plan is made for you. Medicare Advantage insurance companies can choose to stop operating in certain counties, or they might completely withdraw a specific plan from the market.

If your Medicare Advantage plan leaves Medicare or stops providing care in your area, you are granted a special guaranteed issue right. You will have a 63-day window to apply for a Medigap policy without being subjected to medical underwriting.

This 63-day window usually starts on the date your coverage ends. If you receive a letter stating your plan will not be renewed for the following year, you can apply for a new Medigap plan up to 60 days before your current coverage ends. This ensures you do not have a gap in your healthcare. To learn more about your protections in this scenario, read our guide on what to do if your Medicare Advantage plan is dropped in 2027.

Step-by-Step Checklist for Switching to Medigap

If you are ready to make the switch, the order in which you take action is vital. A simple mistake can leave you completely uninsured for months. Follow this exact checklist to protect yourself.

1. Determine your eligibility: Figure out if you have a guaranteed issue right (like a trial right) or if you will need to pass medical underwriting.
2. Apply for the Medigap policy first: Do not cancel anything yet. Submit your application to the Medigap insurance company. If you have to answer health questions, be completely honest. Lying on an insurance application is fraud and can result in your policy being canceled later.
3. Wait for official approval: Wait until you receive a formal letter of acceptance from the Medigap insurer. The letter will state the exact date your new coverage begins.
4. Enroll in a standalone Part D plan: Because Medigap does not cover prescription drugs, you need a Part D plan. You can enroll in Part D during the Fall Annual Enrollment Period (Oct 15 - Dec 7) or the Medicare Advantage Open Enrollment Period (Jan 1 - Mar 31).
5. Let your Part D enrollment cancel your Advantage plan: When you successfully enroll in a standalone Part D plan, Medicare's system will automatically disenroll you from your Medicare Advantage plan. You do not need to call your old insurance company to cancel.

Never cancel your Medicare Advantage plan before your Medigap policy is approved. If you cancel your Advantage plan and then get denied for Medigap, you will be stuck with Original Medicare and no supplemental protection, exposing you to massive out-of-pocket costs.

Don't Forget Part D: Drug Coverage Rules for 2026 and 2027

Medicare Advantage plans almost always include built-in prescription drug coverage. Medigap policies never do. Therefore, when switching from Medicare Advantage to Medigap, you must purchase a standalone Medicare Part D plan.

If you switch to Medigap and forget to buy a Part D plan, you will face a permanent late enrollment penalty if you try to buy one later. The penalty is 1% of the national base premium for every month you did not have creditable drug coverage. For 2027, the base beneficiary premium is officially set at $41.33.

The good news is that Part D has seen massive improvements recently. Thanks to the Inflation Reduction Act, the notorious "donut hole" coverage gap was permanently eliminated.

Looking ahead to 2027, there are a few key Part D numbers you need to know:

• 2027 Maximum Out-of-Pocket Cap: Your out-of-pocket spending for covered Part D drugs is strictly capped at $2,400 for the entire year. (This is an increase from the $2,100 cap in 2026). Once you hit $2,400, you pay $0 for your covered medications for the rest of the year.
• 2027 Maximum Deductible: The highest deductible a Part D plan can charge is $700.

If you take expensive medications and are worried about paying that $2,400 cap all at once early in the year, you can use a free government program to smooth out your costs. Read our guide on how the Medicare Prescription Payment Plan works to learn how to spread your pharmacy costs into manageable monthly installments.

Key Differences Between Medicare Advantage and Medigap Protection

Before you commit to switching, it is important to clearly understand what you are gaining and what you are giving up. Medicare Advantage and Medigap operate on completely different financial models.

Medicare Advantage plans operate like traditional health insurance. You usually pay a low monthly premium, but you pay copayments every time you use a medical service. You must use the plan's network of doctors, and you often need a referral to see a specialist or a prior authorization before the plan will pay for a surgery.

Medigap works alongside Original Medicare. You pay a higher monthly premium to the Medigap insurance company. In exchange, the Medigap policy pays for the deductibles and the 20% coinsurance that Original Medicare leaves behind. There are no networks; you can see any doctor or visit any hospital in the United States that accepts Medicare. There are no prior authorizations required by the Medigap company.

Table 1: Comparing the Features

Cost Comparison: Medicare Advantage vs. Medigap in 2027

To truly understand the financial impact of switching, let's look at the math. The primary tradeoff is paying higher fixed premiums for Medigap versus taking the risk of high out-of-pocket costs with Medicare Advantage.

In 2026, the standard Medicare Part B premium is $202.90 per month. In 2027, official projections show it rising to $209.50 per month. You must pay this Part B premium regardless of whether you choose Medicare Advantage or Medigap.

If you have a serious medical year—perhaps requiring a hospital stay and ongoing specialist visits—the costs look very different. For 2026, the Medicare Part A hospital deductible is $1,736 per benefit period. The Part B medical deductible is $283 for 2026 (projected to rise to roughly $292 in 2027).

Table 2: Scenario for a Heavy Healthcare Year (2027 Projections)

This table compares a typical $0 premium Medicare Advantage plan against a Medigap Plan G (assuming a $200/month Medigap premium and a $40/month Part D premium). Both scenarios assume the beneficiary pays the projected 2027 Part B premium of $209.50.

In a healthy year, the Medicare Advantage path would be cheaper because you avoid the $2,880 in Medigap and Part D premiums. But in a year with heavy medical needs, Medigap Plan G caps your medical spending at just the Part B deductible (projected ~$292 for 2027). A Medicare Advantage plan can legally charge you up to its Maximum Out-of-Pocket limit, which is capped at $9,850 for in-network care in 2027.

How to Compare Medicare Rates on Rebel Rates

Switching from Medicare Advantage to Medigap is a major financial decision. Your location, your age, and your health status will all dictate the exact premiums you are offered. Because prices vary wildly between insurance companies for the exact same coverage, you must shop around.

At Rebel Rates, we believe in giving you the numbers without the sales pitch. You can compare Medicare quotes instantly on our site. We show you real rates from top carriers in your zip code so you can make an informed decision about your healthcare future.

Disclaimer: Rebel Rates is an independent comparison site. We are not affiliated with or endorsed by the U.S. government or the federal Medicare program. Rates depend on your age, location, health, and the specific insurer. We do not guarantee savings, approval, or specific prices, nor do we provide medical, legal, or tax advice.