Medicare Advantage to Medigap

When Can I Leave Medicare Advantage and Get Medigap Without Medical Underwriting?

Federal law gives you the right to enroll in a Medicare Supplement plan without answering health questions in specific situations — including when your Medicare Advantage plan is terminated, leaves your area, or you exercise a trial right. Here is exactly when those rights apply and what to do.

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Published September 24, 2026 · Medicare Guaranteed Issue · By William Gray, Independent Medicare Broker

The four federal GI triggers

Your MA plan is terminated or nonrenewed for the upcoming year
Your MA plan reduces its service area and your county is no longer covered
You are within your 12-month trial right after joining MA for the first time
Your MA plan makes a significant change to its provider network (CMS 2027 guidance)

What Is Medigap Guaranteed Issue?

Medigap guaranteed issue (GI) is a federal protection that requires insurance companies to sell you a Medicare Supplement plan without asking about your health history or pre-existing conditions. Under normal circumstances, if you apply for Medigap outside of your initial open enrollment period, insurers in most states can review your health and decline your application. Guaranteed issue removes that barrier in specific qualifying situations.

The federal right is established under 42 U.S.C. § 1395ss and applies in specific qualifying situations. When you have a guaranteed-issue right, the insurer generally cannot use medical underwriting to deny the protected Medigap policy because of your health — and cannot charge you more because of your health status.

States may provide additional Medigap protections beyond the federal floor. If you live in a state with broader GI rights, you may have more options than what federal law alone provides. Always verify your state's rules with your state insurance department or a licensed broker.

Situation 1: Your Medicare Advantage Plan Is Being Terminated or Nonrenewed

If your Medicare Advantage plan is terminated — meaning the insurer is ending the contract with CMS — or if the plan is nonrenewed for the upcoming year, you have a guaranteed-issue right to enroll in a Medigap plan. This is one of the most common GI triggers and affects thousands of beneficiaries each year when carriers exit markets.

CMS's 2027 Medicare Advantage and Part D Enrollment and Disenrollment Guidance explicitly addresses Medigap GI rights associated with MA contract nonrenewal and service-area reductions. When a plan is nonrenewed, affected members receive a notice and have a window to act.

You generally have 63 days from the date your MA coverage ends to enroll in a Medigap plan under this GI right. Missing that window means returning to standard underwriting in most states. If you received a nonrenewal notice, do not wait — contact a licensed broker as soon as possible to compare your Medigap options.

Situation 2: Your Plan Leaves Your Service Area

If your Medicare Advantage plan reduces its service area and your county or ZIP code is no longer covered, you have a guaranteed-issue right to switch to Medigap. This is treated similarly to a plan termination from your perspective — your coverage is ending through no fault of your own.

Service-area reductions are announced in advance of the plan year. If you receive notice that your plan will no longer serve your area, you have the same 63-day window after your MA coverage ends to enroll in a Medigap plan without underwriting.

Situation 3: Trial Rights — Trying Medicare Advantage for the First Time

Federal law provides a trial right for beneficiaries who join Medicare Advantage for the first time after having Original Medicare with a Medigap plan. If you drop your Medigap plan to join an MA plan and then decide within 12 months that you want to return to Original Medicare, you generally have a guaranteed-issue right to re-enroll in your previous Medigap plan — or a plan with the same or lesser benefits from the same insurer, if your previous plan is no longer available.

A separate trial right applies when you join an MA plan for the first time at age 65 and then decide within 12 months to return to Original Medicare. In that case, you generally have a GI right to enroll in any standardized Medigap plan sold in your state by any insurer — subject to what plans are actually available in your area.

CMS's 2027 enrollment and disenrollment guidance specifically addresses trial rights as a circumstance relevant to Medigap GI protections. If you are within your trial period, this is a time-sensitive opportunity — the 12-month window does not extend. The two trial-right situations have different rules about which plans are available; a licensed broker can confirm exactly which plans apply to your circumstances.

Situation 4: Significant Provider-Network Changes

CMS's updated 2027 guidance recognizes significant provider-network changes as a circumstance that may be relevant to Medigap GI rights and special enrollment periods. Certain qualifying Medicare Advantage circumstances involving significant provider-network changes may create special enrollment and/or Medigap protections. Whether those protections apply depends on the applicable Medicare rules, the specific plan circumstances, the beneficiary's situation, and any additional state protections.

A provider leaving a network does not automatically create a Medigap guaranteed-issue right. The applicable rules govern what qualifies as a significant change and what protections, if any, result. If you believe your plan has made a material change to its network, contact your State Health Insurance Assistance Program (SHIP) or a licensed broker to determine whether a qualifying circumstance applies to your situation.

What Plans Are Available Under Guaranteed Issue?

Under federal GI rights triggered by MA plan termination, nonrenewal, or service-area reduction, you generally have the right to enroll in Medigap Plan A, B, C, D, F (if you were eligible for Medicare before January 1, 2020), G, K, L, M, or N. Plan G is the most comprehensive plan available to new Medicare enrollees today and covers everything except the Part B deductible.

Plan N is a strong alternative to Plan G for beneficiaries who want lower premiums and are comfortable with small copays at doctor visits and emergency rooms. Both Plan G and Plan N are available from multiple carriers in most states, and rates vary significantly by carrier, ZIP code, and age.

Under trial rights, the available plans depend on which trial-right situation applies — the rules differ between the two scenarios. Your broker can confirm exactly which plans you qualify for based on your specific GI trigger and circumstances.

The 63-Day Window: Do Not Miss It

Most federal GI rights come with a 63-day enrollment window that begins when your qualifying event occurs — typically the date your Medicare Advantage coverage ends. If you miss the 63-day window, you lose the guaranteed-issue protection and must go through standard underwriting in most states.

Standard underwriting means the insurer reviews your health history and can decline your application or charge higher rates based on pre-existing conditions. For many people with health conditions, losing the GI window means losing access to Medigap entirely — or paying significantly more.

If you received a plan termination or nonrenewal notice, start the process immediately. Have the actual notice in front of you when you call — it contains the coverage-end date that starts your window. A licensed broker can help you compare Plan G and Plan N rates in your area and complete the enrollment before the window closes.

What Guaranteed Issue Does Not Cover

Guaranteed issue rights do not apply simply because you are unhappy with your Medicare Advantage plan, want lower premiums, or prefer Original Medicare. Outside of qualifying events, you must go through standard underwriting to enroll in Medigap in most states.

GI rights also do not guarantee a specific premium. The insurer must accept your application, but rates are still based on your age, location, and the plan you choose. Rates vary by carrier — comparing quotes from multiple carriers is essential even when you have a GI right.

GI rights do not apply to Medicare Advantage plans themselves — they apply only to Medicare Supplement (Medigap) plans. If you want to switch from one MA plan to another, that is governed by MA enrollment rules, not Medigap GI rules.

The 63-day window is not flexible

Most guaranteed-issue rights expire 63 days after your Medicare Advantage coverage ends — the clock starts on your coverage-end date, not when you receive the notice. Once the window closes, you return to standard underwriting in most states, and insurers can decline your application based on health history. Have the actual notice in front of you when you call — it contains the coverage-end date that starts your window.

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Related Medicare guides

Frequently asked questions about Medicare Advantage to Medigap

Can I switch from Medicare Advantage to Plan G without underwriting?

If you have a qualifying event — such as your MA plan being terminated, nonrenewed, or leaving your service area — federal law generally gives you a guaranteed-issue right to enroll in Plan G (and other Medigap plans) without medical underwriting. You generally have 63 days from when your MA coverage ends to act. Whether the right applies to your specific situation depends on the qualifying event and applicable rules.

What happens if my Medicare Advantage plan is cancelled for 2027?

If your plan is nonrenewed or terminated, you have a guaranteed-issue right to enroll in a Medicare Supplement plan without answering health questions. You will receive a notice from your plan and from CMS. Have that notice in front of you when you contact a licensed broker — it contains your coverage-end date, which starts your 63-day window.

How long do I have to enroll in Medigap after my MA plan ends?

You generally have 63 days from the date your Medicare Advantage coverage ends to enroll in a Medigap plan under your guaranteed-issue right. This window does not extend, so it is important to act quickly once you receive a termination or nonrenewal notice.

What is a Medicare Advantage trial right?

Federal law provides two distinct trial-right situations. If you dropped a Medigap plan to join MA and return to Original Medicare within 12 months, you generally have a right to re-enroll in your previous plan or a comparable plan from the same insurer. If you joined MA for the first time at 65 and return within 12 months, you generally have a right to any standardized Medigap plan sold in your state. The two situations have different rules — a licensed broker can confirm which applies to you.

Does guaranteed issue mean I pay the same rate as everyone else?

Guaranteed issue means the insurer generally cannot decline your application or charge more because of your health history. However, rates still vary by age, ZIP code, plan, and carrier. You should compare quotes from multiple carriers even when you have a GI right — rates can differ by hundreds of dollars per year for the same plan.

Can I get Medigap if my MA plan changed its provider network?

Certain qualifying Medicare Advantage circumstances involving significant provider-network changes may create special enrollment and/or Medigap protections under CMS's 2027 guidance. A provider leaving a network does not automatically create a Medigap GI right. Whether a specific network change qualifies depends on the applicable Medicare rules, the plan circumstances, and your state's protections. Contact your SHIP counselor or a licensed broker to determine whether a qualifying circumstance applies to your situation.

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Your MA Plan Is Ending — Let's Investigate Your Medigap Options

If your Medicare Advantage plan is being terminated or nonrenewed for 2027, you may have a limited window to enroll in a Medigap plan. Have the actual notice in front of you — we can help determine what Medicare coverage paths should be investigated and compare the plans we represent where you live.

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