Switching Medicare Advantage to Medigap is one of the most important decisions a Medicare beneficiary can make. It means leaving a managed care plan and returning to Original Medicare with supplemental coverage. Many people consider this switch when they feel restricted by provider networks or prior authorization requirements. However, the process is not as simple as changing plans during open enrollment. Timing matters enormously. Medical underwriting can block your application if you miss key deadlines. Understanding your rights, enrollment windows, and potential penalties is essential before switching Medicare Advantage to Medigap in 2026.
When Can You Start Switching Medicare Advantage to Medigap?
There is no single “switching season” for this change. Instead, several enrollment windows may apply to your situation. The most common window is the Medicare Advantage Open Enrollment Period (MA OEP). It runs from January 1 through March 31, 2026. During this period, you can drop your MA plan and return to Original Medicare.
You can also make this switch during the Annual Election Period (AEP). The AEP for 2027 coverage runs October 15 through December 7, 2026. Special Enrollment Periods may also apply if you have a qualifying life event.
| Enrollment Window | 2026 Dates | What You Can Do |
|---|---|---|
| MA Open Enrollment Period | January 1 – March 31, 2026 | Drop MA, return to Original Medicare |
| Annual Election Period (for 2027) | October 15 – December 7, 2026 | Drop MA effective January 1, 2027 |
| Medigap Open Enrollment | 6 months from Part B start date | Buy any Medigap plan, no underwriting |
| MA Trial Right | Within 12 months of first MA enrollment | Return to Original Medicare + Medigap guaranteed issue |
| Special Enrollment Period | Varies by qualifying event | Switch due to move, plan termination, etc. |
During the MA OEP, you can only make one plan change. Changes take effect the first day of the following month. The MA OEP does not apply to people in Medicare Savings Account plans, cost plans, or PACE programs.
Who Is Eligible to Switch?
Anyone enrolled in a Medicare Advantage plan can disenroll and return to Original Medicare. That part is straightforward. The harder question is whether you can get a Medigap policy afterward. Switching Medicare Advantage to Medigap requires either guaranteed issue rights or passing medical underwriting.
You have a federal “trial right” if you enrolled in MA for the first time at age 65. This right lasts 12 months from your MA plan’s effective date. During this window, insurers must sell you Medigap Plans A, B, C, D, F (if eligible), G, K, or L at standard rates. No health questions. No denials. You must apply within 63 days of your MA coverage ending.
A second trial right exists if you dropped an existing Medigap policy to try Medicare Advantage. You have 12 months to return. The insurer must give you back your old Medigap plan or offer a comparable one. Some states offer additional protections. New York and Connecticut require guaranteed issue for Medigap year-round. Massachusetts has an annual window from February 1 through March 31. California offers a 60-day birthday rule window each year.
What to Expect When Switching Medicare Advantage to Medigap
When switching Medicare Advantage to Medigap, you are making three separate coverage changes at once. First, you disenroll from your MA plan. Second, you enroll in a standalone Part D prescription drug plan. Third, you apply for a Medigap supplemental policy. All three steps must be coordinated carefully.
Your Medigap policy will cover costs that Original Medicare does not pay. These include the Part A deductible ($1,676 in 2026), Part B coinsurance (20%), and hospital coinsurance for extended stays. The most popular plans are Plan G and Plan N. Plan G covers nearly all out-of-pocket costs except the Part B deductible. Plan N has lower premiums but includes small copays for office and ER visits.
You also need a standalone Part D plan for prescription drug coverage. Most MA plans bundle drug coverage. When you leave MA, that drug coverage ends. Enroll in Part D during the same month you disenroll from MA. This prevents any gap in drug coverage and avoids late enrollment penalties.
What Happens If You Miss the Deadline?
Missing the right enrollment window when switching Medicare Advantage to Medigap can have serious consequences. The biggest risk is medical underwriting. Outside of guaranteed issue periods, Medigap insurers in most states can review your health history. They can deny your application entirely. They can charge higher premiums. They can impose waiting periods for pre-existing conditions.
According to KFF research, roughly 90% of Medicare Advantage enrollees age 65 and older lack guaranteed issue protections for Medigap. Conditions like diabetes, heart disease, or cancer can result in denial. Many beneficiaries report feeling trapped in their MA plans because of this barrier.
There is also a Part D late enrollment penalty to consider. If you go 63 or more consecutive days without creditable drug coverage, you will pay a permanent surcharge. The 2026 penalty is 1% of the national base premium ($38.99) per uncovered month. Twenty-four months without coverage adds $9.36 per month to your Part D premium for life. This penalty never goes away.
Step-by-Step: How to Enroll
Step 1: Research Medigap plans before disenrolling from MA. Contact insurers in your state to check availability and pricing. If you do not have guaranteed issue rights, apply for Medigap first. Confirm you are accepted before dropping your MA plan. Switching Medicare Advantage to Medigap without a backup plan is risky.
Step 2: Enroll in a standalone Part D plan. This is the cleanest way to disenroll from MA. When you enroll in a Part D plan, your MA plan is automatically canceled. Both changes take effect the first of the following month. Do this through Medicare Plan Finder or by calling 1-800-MEDICARE (1-800-633-4227).
Step 3: Apply for your Medigap policy. If you have guaranteed issue rights, apply within 63 days of your MA coverage ending. Gather these documents: your Medicare card (red, white, and blue), proof of MA disenrollment, and any letters confirming your coverage change dates. Step 4: Confirm all effective dates.
Verify that your Original Medicare, Part D, and Medigap coverage all start on the same date. Any gap leaves you exposed to full medical costs. Step 5: Keep your MA card until the switch date. Your MA coverage continues until the effective date of your new enrollment. Do not destroy your card early.
Common Mistakes to Avoid
Dropping MA before securing Medigap. This is the most dangerous mistake when switching Medicare Advantage to Medigap. If you disenroll from MA and then get denied for Medigap, you are left on Original Medicare with no supplemental coverage. The 20% Part B coinsurance has no annual cap. A single hospital stay could cost tens of thousands of dollars.
Waiting too long to use your trial right. The 12-month trial right window is strict. Once it expires, you lose guaranteed issue protection permanently. Many people do not realize they had this right until it is too late. Mark your calendar from the day your MA coverage started. People considering switching Medicare Advantage to Medigap should act within the first year.
Forgetting to enroll in Part D. Your MA plan likely included drug coverage. When you leave, that coverage vanishes. Every month without Part D adds to your late enrollment penalty. Enroll in Part D the same month you disenroll from MA. Also, do not assume all Medigap plans cover prescriptions. They do not. Medigap and Part D are completely separate. Finally, switching Medicare Advantage to Medigap requires careful coordination. Work with your State Health Insurance Assistance Program (SHIP) for free, unbiased guidance.
Frequently Asked Questions
Can I switch from Medicare Advantage to Medigap at any time of year?
You can disenroll from MA during the MA OEP (January 1–March 31) or the AEP (October 15–December 7). However, getting a Medigap policy depends on your guaranteed issue rights. Without those rights, insurers can deny your application based on health status in most states. Switching Medicare Advantage to Medigap requires both disenrollment timing and Medigap eligibility to align.
Will I face medical underwriting when applying for Medigap?
In most states, yes — unless you qualify for guaranteed issue rights. Trial rights protect first-time MA enrollees for 12 months. Four states (New York, Connecticut, Massachusetts, and Maine) offer broader protections. If you have been in Medicare Advantage for several years, expect health questions on your Medigap application.
What is the best Medigap plan to choose when switching Medicare Advantage to Medigap?
Plan G is the most popular choice in 2026. It covers all out-of-pocket costs except the annual Part B deductible ($257 in 2026). Plan N is a lower-premium alternative with small copays for doctor visits ($20) and emergency room visits ($50). Compare quotes from multiple insurers, as Medigap premiums vary widely for identical coverage.
Do I need to notify my Medicare Advantage plan that I am leaving?
No. When you enroll in a standalone Part D plan, Medicare automatically disenrolls you from your MA plan. You will receive a letter confirming the change. Keep this letter as proof of your coverage transition dates. You may need it when applying for your Medigap policy.
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Official Sources & Resources
For verified Medicare information and enrollment help:
- Medicare.gov: medicare.gov
- CMS.gov: cms.gov
- NAIC Medigap Guide: naic.org
- KFF Medicare Research: kff.org/medicare
- Find Your SHIP: medicare.gov/contacts
Content last reviewed April 2026. If you notice any outdated information, please contact us.