How to Leave a Medicare Advantage Plan (and the Medigap Trap Waiting for You)

Leaving a Medicare Advantage plan is one of the easiest things to do in Medicare. There are several windows for it, and the mechanics are simple. The hard part is what comes next. If you leave Advantage and want the freedom of Original Medicare plus a Medigap plan, you may run straight into medical underwriting, which means an insurer can review your health and charge you more or turn you down. Understanding both halves of this, the easy exit and the potential Medigap trap, before you make a move is what keeps a clean switch from becoming a costly mistake.

Bryce's Take

Leaving Advantage is the easy part, and that is exactly what lulls people into a mistake. They drop the plan, then apply for Medigap, and if their health has changed since 65, they get declined and end up stuck on Original Medicare with no cap on their costs. The rule I give clients is simple: never drop your Advantage plan until the Medigap plan is approved and in force, unless you have a guaranteed-issue right. If your health has changed, we build the strategy before you touch anything.

The windows for leaving

You can leave a Medicare Advantage plan during several periods. The Annual Enrollment Period, October 15 to December 7, lets you switch plans or return to Original Medicare with coverage starting January 1. The Medicare Advantage Open Enrollment Period, January 1 to March 31, lets you make one change if you are already in an Advantage plan, including dropping back to Original Medicare. A Special Enrollment Period can apply if you move, lose coverage, or meet other qualifying circumstances. And if a 5-star plan is available in your area, you can switch to it during a special window. There is almost always a path out.

What happens when you leave

When you disenroll from a Medicare Advantage plan and return to Original Medicare, you go back to Parts A and B, paying the standard cost-sharing without the plan's network, copays, or extra benefits. Two things need attention immediately. First, Advantage plans usually include drug coverage, and Original Medicare does not, so you must add a standalone Part D plan or you risk a late-enrollment penalty and a gap in prescription coverage. Second, Original Medicare has no cap on your 20 percent share of costs, which is why most people who go this route add a Medigap plan to limit their exposure.

How to actually disenroll

You do not usually need to formally cancel your Advantage plan as a separate step. Enrolling in a new plan, such as a Part D drug plan paired with Original Medicare, automatically disenrolls you from your Advantage plan. If you simply want to return to Original Medicare, you can also call 1-800-MEDICARE or use your Medicare account to disenroll. Just make sure your new coverage, including drug coverage and any Medigap plan, is lined up to take effect the moment your Advantage plan ends, so you are never uncovered.

The Medigap trap

Here is where people get caught. Leaving Advantage is easy, but adding a Medigap plan afterward is often not, because outside of specific protected windows, Medigap insurers in most states can use medical underwriting. That means they can review your health history and decline you, exclude conditions, or charge more. Your best guaranteed access to Medigap was during your initial Medigap open enrollment at 65, or under a guaranteed-issue or trial right. If those windows have passed and your health has changed, you could drop your Advantage plan expecting to pick up Medigap and then be denied the Medigap plan, leaving you on Original Medicare with no cap on costs.

When you can still get Medigap without underwriting

There are protected situations. If you joined your very first Advantage plan at 65 and want to switch back within the first 12 months, you have a trial right to buy Medigap without underwriting. Certain guaranteed-issue rights apply if your plan leaves your area or you move out of its service area. A handful of states, including Connecticut, Massachusetts, Maine, and New York, require Medigap insurers to sell to you regardless of health at various times, and Washington has an annual birthday rule. If one of these applies to you, the trap does not, and you can move freely.

The safe way to make the switch

If you want Original Medicare plus Medigap and you are not in a guaranteed-issue window, protect yourself by sequencing carefully. Apply for the Medigap plan first and wait until it is approved and effective before disenrolling from your Advantage plan. That way, if underwriting denies you, you still have your Advantage coverage and have lost nothing. Never drop your Advantage plan on the assumption that Medigap will be there, unless you have a guaranteed-issue right. Confirming your Part D drug coverage timing at the same time keeps the whole transition gap-free.

Bryce Casson

Licensed Independent Medicare Broker

Bryce Casson is an independent Medicare insurance broker who works with every major carrier. He does not represent any single insurer, which means his recommendations are based on what actually fits each client's situation, not on commissions or quotas.