At 71, She Tried to Trade Her Advantage Plan for Original Medicare. Three Health Questions Ended It.

A 71-year-old Florida widow had spent two years fighting her Medicare Advantage plan over a cardiology referral. She finally decided she was done. A broker helped her choose Medigap Plan G and start the application. Then the insurer saw the stent placed in 2023 and declined her. Other carriers followed. She was allowed to leave Medicare Advantage. Buying the coverage she wanted on the other side was the problem.

This is the trap many Advantage enrollees do not see until they try to leave. Joining an Advantage plan feels easy and reversible. Returning to Original Medicare is direct. Adding Medigap afterward may not be. If you are still inside your first six months with Part B, consider this a warning shot. If you are past that window and contemplating a switch, read carefully.

The One-Time Medigap Window

The federal Medigap open enrollment period lasts six months, beginning the first month someone is both 65 or older and enrolled in Part B. Inside that window, an insurer must sell any Medigap policy it offers without medical underwriting. The carrier cannot deny coverage or charge more because of health, although premiums can still vary by location, age, tobacco use, and the insurer’s rating method.

Outside that period, carriers in most states may review medical and prescription histories, charge more, or decline the application. A recent stent, active cancer treatment, insulin use, or a recent hospitalization may create problems, but underwriting rules vary. The diagnosis matters, the timing matters, and the carrier matters.

The six-month window is not the only federal protection. Someone who joined Medicare Advantage when first eligible at 65 generally has a 12-month trial right to return to Original Medicare and buy Medigap. A person who dropped Medigap to try Advantage for the first time may also have 12 months to return. Guaranteed-issue rights can arise when a plan terminates, leaves the service area, or undergoes certain major network changes.

None of those protections ordinarily helps someone voluntarily leaving Advantage after two uneventful years of enrollment. That is where the Florida widow found herself.

State law can also change the answer. New York and Connecticut offer continuous Medigap enrollment protections. Massachusetts has an annual open-enrollment period. Maine provides an annual guaranteed-issue period, but generally only for Plan A. Other states have birthday or anniversary rules that mostly help existing Medigap policyholders switch supplements. Check the exact state rule before assuming the door is either open or closed.

What Original Medicare Costs Without a Supplement

Someone who leaves Advantage and cannot buy Medigap can land on Original Medicare with no supplemental backstop. That is a specific and pricey place to sit in 2026.

Part A charges a $1,736 inpatient deductible per benefit period, not per calendar year. A new benefit period can mean another deductible. Days 61 through 90 add $434 per day in coinsurance, while lifetime reserve days cost $868. Skilled nursing coinsurance is $217 per day for days 21 through 100, and the patient pays all costs after day 100.

Part B carries a $202.90 standard monthly premium and a $283 annual deductible, followed by 20% coinsurance on most approved services. Original Medicare has no annual out-of-pocket maximum. A cancer diagnosis, joint replacement, or expensive Part B medication can turn that uncapped percentage into a large bill.

Medigap Plan G exists to close most of those holes. After the Part B deductible, it covers most Part A and Part B cost-sharing. It does not cover prescription drugs, routine dental and vision care, or custodial long-term care. That was the protection the widow wanted. Her health history made it harder to buy.

What the Advantage Maximum Does and Does Not Fix

The counterargument is familiar: Medicare Advantage has an annual medical out-of-pocket maximum, so how bad can it get?

The cap applies to covered Part A and Part B services. In an HMO, nonemergency out-of-network care generally is not covered at all. A PPO may cover it, but usually at higher cost and under a separate combined limit. Part D drug spending also sits outside the medical maximum, although covered Part D drugs have their own $2,100 out-of-pocket cap in 2026.

The harder-to-price issue is access. Networks can change, and prior authorization may delay or deny particular services. The $0 premium is easy to compare. The cost of losing a trusted specialist is not.

What to Do Before You Try to Switch

Three steps keep a frustrating plan from turning into a coverage mistake:

1. Apply for Medigap before leaving Advantage. Have a broker compare underwriting requirements, but do not rely on an informal pre-screen alone. Obtain written acceptance, confirm the premium, and coordinate the effective date before ending the Advantage coverage.
2. Use the Medicare Advantage Open Enrollment Period carefully. From January 1 through March 31, an Advantage member may make one switch to another Advantage plan or return to Original Medicare. Moving between Advantage plans does not require Medigap underwriting. Returning to Original Medicare does not guarantee that a supplement will accept you.
3. Check every possible guaranteed-issue right. Look for a federal trial right, plan termination, service-area move, major network change, or state protection before submitting to underwriting. Keep notices and coverage letters that could prove eligibility.

The Advantage decision at 65 is not always a one-way door. But the doorway can narrow sharply once health problems arrive. The premium is printed in large type; the underwriting risk waits silently offstage.

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