Switching to Medicare Advantage Is Easy. Switching Back Can Be Impossible

A 67-year-old in Florida picked a $0-premium Medicare Advantage plan two years ago because the math looked obvious: no monthly premium, dental and vision thrown in, a gym membership. Then came a cardiology referral, a prior authorization fight, and a specialist three counties away who is suddenly out of network. She calls during the fall Annual Enrollment Period to switch back to Original Medicare plus a Medigap policy. The insurance company asks about her recent diagnosis. The application is denied.

This is the trap that almost no one sees at age 65. Moving into Medicare Advantage is frictionless. Moving back out to Original Medicare with a supplement is, in most states and after the first year, gated by medical underwriting. If your health has changed, the door may already be closed.

The Underwriting Asymmetry No One Explains at Sign-Up

Federal law gives most new enrollees one clean shot at a Medigap policy: a six-month open enrollment window that begins when you are both age 65 or older and enrolled in Part B. Inside that window, any insurer selling Medigap in your state must issue you a policy regardless of health history. Outside it, insurers in most states can ask about your medical history, charge you more, or refuse to sell you a policy at all, subject to state-specific protections and guaranteed-issue rights.

That window does not pause because you chose Medicare Advantage. It runs out on the calendar, period. If you start with a $0-premium Advantage plan at 65, then try to switch to Original Medicare plus Medigap at 70 after a cancer diagnosis or heart condition, you are applying as a new customer with a pre-existing condition. The insurer in most states can say no.

Suze Orman put the asymmetry bluntly on her podcast: “If you switch from a Medicare Advantage policy back to Medicare that doesn’t apply anymore. So it may make it financially impossible for you to switch back to original Medicare if you want the freedom to choose your doctors.”

The Narrow Exits That Do Exist

Federal law carves out two real, if narrow, escape hatches.

The Medicare Advantage trial right. If you joined an Advantage plan when you were first eligible for Medicare at 65, you have a single 12-month period to switch back to Original Medicare and buy any Medigap policy sold in your state on a guaranteed-issue basis. The same 12-month protection applies if you dropped a Medigap policy to try Advantage for the first time. After month 13, you are subject to underwriting like everyone else.

State guaranteed-issue rules. Several states provide Medigap protections beyond the federal minimum, but Connecticut, New York, Massachusetts, and Maine are among the most expansive. Connecticut and New York require year-round guaranteed issue for Medigap. Massachusetts provides an annual Medigap open enrollment period. Maine requires insurers to make at least one Medigap plan continuously available without medical underwriting. If you live in one of these states, the “impossible” framing softens considerably. Elsewhere, medical underwriting often remains a significant obstacle.

What the Switch-Back Actually Costs

Assume the underwriting goes your way and you can buy a Medigap Plan G. You will pay the 2026 Part B premium of $202.90 per month plus a Medigap premium that, depending on state and age, often runs from about $130 to $300 per month, plus a standalone Part D drug plan. That is roughly $350 to $500 per month for one person, against $0 for the Advantage plan you are leaving. The supplement is worth it for a person with chronic, expensive care needs. It is a hard sell at 65 to a person who feels fine, which is exactly why so many start in Advantage and discover the lock-in later.

The Advantage in-network out-of-pocket maximum does not include Part D drug spending. In PPO plans, out-of-network costs may be subject to a separate and higher maximum, while HMO plans generally do not cover non-emergency out-of-network care at all. A serious illness that requires specialized care can expose enrollees to costs and access limitations that are not obvious from the advertised in-network maximum alone.

What To Do Before the Door Closes

• If you are about to turn 65 and lean healthy: understand that choosing Advantage now is closer to a one-way door than the sales materials suggest. The six-month Medigap window will not come back.
• If you are inside year one of your first Advantage plan: you still have a trial right. Use it deliberately, not by accident. The clock is 12 months from enrollment, not from when you noticed the network was tight.
• If you live in CT, NY, MA, or ME: check your state’s specific Medigap rules before assuming you are stuck. The federal default does not apply to you.
• If your trial right has passed and you live elsewhere: apply for Medigap during a healthy stretch if you ever plan to switch. Insurers underwrite on what you disclose today, not on what you might develop next year.

Sources: CMS 2026 Medicare Parts A & B Premiums and Deductibles fact sheet; Medicare.gov Medigap basics; KFF and Medicare Rights Center on state guaranteed-issue rules. Figures reflect the 2026 plan year.