Switching from Medicare Advantage to Medigap

Some people on a Medicare Advantage plan reach a point where they want to go back to Original Medicare and pair it with a Medicare Supplement, or Medigap, policy. It's a reasonable thing to consider, and it's also more complicated than switching between two Advantage plans. Here is what actually changes, and the one part of this process that catches people off guard.

Why people consider this move

Medicare Advantage plans are run by private insurers and typically use a network — an HMO or PPO — that limits which doctors and hospitals you can see at the lowest cost, and usually requires referrals for specialists. Original Medicare works differently. If a provider accepts Medicare, which the large majority do, you can see them without a referral and without checking whether they're in a network, because there isn't one. That matters most to people who split time between two states, who have a specialist they don't want to lose, or who simply want fewer restrictions on where they get care. A Medigap policy sits on top of Original Medicare and helps cover the coinsurance, copays, and deductibles that Original Medicare leaves you responsible for, so your out-of-pocket costs are more predictable than they are under many Advantage plans.

What changes when you switch

You'd be enrolled in Original Medicare Part A and Part B, plus a standalone Medigap policy to help with cost-sharing, plus a separate Part D plan for prescription drugs since Original Medicare doesn't include drug coverage on its own. That's three pieces instead of one bundled Advantage plan. In exchange, you get nationwide coverage from any provider who accepts Medicare, no referrals, and no annual out-of-pocket maximum to watch because Medigap is generally covering the gaps as they come up.

The part people don't expect: medical underwriting

This is the honest, important part. Unlike Medicare Advantage and Part D, which generally can't turn you away or charge you more because of your health during an enrollment period you qualify for, Medigap insurers are allowed to use medical underwriting in most states — meaning they can review your health history and decide whether to accept you, and what to charge you, unless you have a specific legal protection called a guaranteed-issue right. Outside of a guaranteed-issue right, an insurer can decline your application or price the policy higher based on your health conditions. This is the single biggest reason a switch from Advantage to Medigap isn't always as simple as filling out a form, and it's worth understanding before you drop your current plan.

Rules vary by state

Guaranteed-issue protections and enrollment timing for Medigap are not identical across the country. A number of states have adopted rules that give residents more frequent or more open opportunities to buy a Medigap policy without medical underwriting than federal law requires on its own. Because of that, whether this switch is guaranteed for you depends partly on which state you live in and partly on your specific enrollment history. This isn't something we can generalize accurately on a page — it's worth a direct conversation.

Timing

You can drop a Medicare Advantage plan and return to Original Medicare during the Annual Enrollment Period, October 15 through December 7, with the change taking effect January 1, or during the Medicare Advantage Open Enrollment Period, January 1 through March 31, if you're already enrolled in an Advantage plan. Applying for a Medigap policy is a separate step from dropping your Advantage plan, and it's generally worth applying for Medigap first and confirming acceptance before you cancel your existing coverage.

What to weigh before you switch

A Medigap policy generally costs more in monthly premium than staying on a Medicare Advantage plan, since you're paying for predictable cost-sharing every month rather than only when you use care. Whether that trade makes sense depends on how often you see specialists, whether you travel or split time between states, and how much certainty you want around your out-of-pocket costs. It also helps to know that Medigap premiums vary by how the insurer prices the policy — some use your age at the time you enroll, others use your current age and adjust every year — which affects how the cost changes over time. None of this is a reason to avoid the switch, but it's worth understanding what you're comparing before you commit to it.

If you're weighing this switch, the honest next step is to have someone look at your specific situation — your state, your enrollment history, and your health — before you make any changes. A licensed agent can tell you plainly whether you qualify for guaranteed issue, and what your options look like if you don't.