The Medicare Advantage Trial Right: How Priya Iyer Switched Back to Original Medicare Without Medical Underwriting

*6 min read · Last updated May 18, 2026*

In this article

– What the 12-month trial right actually grants – Two distinct trigger scenarios – How to actually use the trial right – What happens after the 12-month window closes – Beneficiaries who should pay particular attention – FAQ

Priya Iyer, 66, a retired pediatrician from suburban Atlanta, enrolled in a Medicare Advantage plan at 65 because it offered a $0 premium, dental, vision, and a gym membership. Eight months in, she had a hip replacement. Recovery did not go as planned, and her surgeon recommended four weeks of inpatient skilled nursing rehabilitation. The MA plan’s prior authorization department approved seven days, then denied each extension. Priya paid for the rest out of pocket, called her daughter for help, and learned about a window she had never heard of from any agent or broker.

What the 12-month trial right actually grants

Under the Medicare Modernization Act, certain beneficiaries who enroll in a Medicare Advantage plan have a 12-month window to disenroll, return to Original Medicare (Part A and Part B), and buy a Medicare Supplement (Medigap) policy on a guaranteed-issue basis. Guaranteed issue means the Medigap carrier cannot deny the application, cannot charge a higher premium because of pre-existing conditions, and cannot impose a waiting period for pre-existing care.

This protection is meaningful because outside of the trial right and the initial Medigap open enrollment window at age 65, most states allow Medigap carriers to medically underwrite applicants. A beneficiary with cancer history, diabetes, heart disease, or recent surgery can be declined or surcharged out of the market.

For a refresher on how the two paths differ, see our explainer on Medicare Advantage vs Medicare Supplement (Medigap).

Two distinct trigger scenarios

The federal rule applies in two situations, and they have different mechanics:

– Trigger 1: First-time Medicare enrollee who chose MA at 65. A beneficiary whose very first Medicare coverage decision at age 65 was a Medicare Advantage plan has 12 months from the MA effective date to switch back to Original Medicare and buy any Medigap policy on a guaranteed-issue basis. This is the most generous version of the rule. – Trigger 2: Beneficiary who dropped Medigap to try MA for the first time. A beneficiary who already had a Medigap policy, dropped it, and tried Medicare Advantage for the first time has 12 months from the MA effective date to switch back to Original Medicare and reinstate Medigap. Two limits apply here: they can only buy back the same Medigap policy they had before, and the right is one-time-use for life.

Beneficiaries who have used Medicare Advantage in any prior year and re-enroll do not qualify under either trigger. The trial right is for first-time experience with MA, not for ongoing back-and-forth.

How to actually use the trial right

The mechanics are mostly paperwork in the right order:

– Step 1. Contact Medicare (1-800-MEDICARE) or your State Health Insurance Assistance Program (SHIP) to confirm your trial right is still active. The clock runs from your MA plan’s effective date, not from enrollment date. – Step 2. Apply for a Medigap policy from any licensed carrier in your state. On the application, indicate the trial right (sometimes labeled “guaranteed issue right under 12-month trial period”). Provide a copy of your MA enrollment confirmation showing the effective date. – Step 3. Time the disenrollment carefully. Submit the MA disenrollment to take effect on the first day of the month that the Medigap policy starts. A gap of even one day creates an exposure where Original Medicare alone is in force. – Step 4. Choose Part D prescription drug coverage separately. MA plans usually bundle drug coverage; Original Medicare with Medigap does not, so a standalone Part D plan is required to avoid the late enrollment penalty later.

What happens after the 12-month window closes

This is where most beneficiaries get stuck. Outside of the trial right and initial enrollment, only four states require Medigap carriers to issue without medical underwriting: New York, Connecticut, Massachusetts, and Maine. California, Oregon, and Washington offer “birthday rules” that allow limited switching once a year without underwriting, but only between similar Medigap plans, not from MA to Medigap.

In the other 43 states, a beneficiary who passes the 12-month deadline can apply for Medigap, but the carrier can decline based on health questions, charge a higher rate-up premium, or impose a six-month pre-existing condition waiting period. For someone who has already had a major procedure inside MA, the realistic outcome is denial.

For the everyday claim experience that often drives the switch, our piece on Medicare Advantage prior authorization denials walks through the most common denial categories.

Beneficiaries who should pay particular attention

Three groups have the most to lose if the trial right passes unused:

– Anyone whose health changed materially after enrolling in MA (new cancer diagnosis, cardiac event, major surgery, dementia diagnosis). – Anyone whose providers left the MA network mid-year. – Anyone hitting MA out-of-pocket maximums (typically $7,500 to $9,400 in-network for 2026) and realizing the math is worse than Medigap Plan G plus Part D would have been.

FAQ

How long is the Medicare Advantage trial right? The trial right runs for 12 months from the effective date of your Medicare Advantage plan, not from when you enrolled or from your 65th birthday. If your MA plan started January 1, your trial right expires the following December 31, and the guaranteed-issue Medigap window closes with it.

Can I use the trial right more than once? No. The trial right is a one-time federal protection per person. The version available to beneficiaries who had Medigap, dropped it for MA, and want to return is specifically limited to one use over a lifetime. The version available to first-time Medicare enrollees who chose MA at 65 is also one-time.

Will a Medigap carrier still ask health questions during the trial right? A licensed Medigap carrier in any state must issue the policy on a guaranteed-issue basis when the applicant qualifies under the trial right. The carrier may still ask health questions on the application, but the answers cannot be used to deny coverage, charge a higher premium, or impose a pre-existing condition waiting period.

What happens to my Part D drug coverage when I leave Medicare Advantage? You need to enroll in a standalone Part D plan when you switch from MA back to Original Medicare and Medigap. MA plans usually bundle Part D, but Original Medicare with Medigap does not. You can enroll during the same Special Enrollment Period that the trial right triggers, but missing it can produce a late enrollment penalty that follows you for life.