The Medigap door locks behind you. Leaving Medicare Advantage for a Supplement later can mean health questions, a denial, or a higher price.

Part five of Healthcare in Retirement. No legal pad today, but the same discipline. Every rule below is checked against Medicare's own Medigap guide, the Arizona SHIP booklet, and Nevada's Division of Insurance, because this is the corner of Medicare where a decision made at 65 can quietly become permanent.

The situation

You went with a Medicare Advantage plan at 65. It was a reasonable choice, the premium was low, and for three years it was fine. Then the premium climbed, or your doctor left the network, or a diagnosis arrived and you decided you wanted what your neighbor has: Original Medicare plus a Supplement, any doctor, no network. You apply. The application asks about your health. And the answer comes back no.

A woman called us after exactly that, baffled: "We don't even take prescriptions, like, what?" Another couple would not even try an Advantage plan because, in the husband's words, "if I were to go to the Advantage and then try to go back, nobody would want to pick her up." He was not wrong to worry. Here is why.

Two kinds of plans, two kinds of doors

Medicare Advantage plans work like an annual subscription. Every fall, October 15 to December 7, you can switch to a different plan, and nobody asks about your health. People get used to that, and they assume Supplements work the same way.

They do not. A Medicare Supplement, also called Medigap, has one guaranteed door. "This is the 6-month period that starts the first day of the month you're 65 or older and signed up for Part B." During those six months, an insurer must sell you a policy and cannot charge you more for your health. Medicare's guide is explicit that it is "a one-time enrollment period; it doesn't repeat every year." After it closes, in most states, the insurer can ask health questions, charge more, or say no.

KFF put a number on what that means for people who chose Advantage first. Nine in ten Advantage enrollees 65 and older, 22.4 million people, have no guaranteed right to buy a Supplement beyond the trial period we are about to talk about. Only four states, Connecticut, Massachusetts, Maine, and New York, guarantee it to everyone. Arizona and Nevada are not on that list.

One more wrinkle that ties back to part two of this series. If you delayed Part B because you were still working, your six-month Medigap window does not start until Part B does. It is not lost. It just waits.

The one protection you get: the 12-month trial right

Federal rules give you one clean exit, and it comes in two versions. If you joined an Advantage plan when you first became eligible at 65 and you leave within the first year, you have a guaranteed right to buy any Supplement sold in your state, no health questions. And if you had a Supplement, dropped it to try an Advantage plan for the first time, and want it back within 12 months, the insurer has to give you your old policy back if it still sells it. Both are spelled out in Medicare's Medigap guide, along with the timing: you can apply as early as 60 days before your Advantage coverage ends and no later than 63 days after.

Our advisors use this constantly. A client who was torn about trying Advantage heard it this way: "Because it's your first time, you get a 12-month trial. If at any time during the first 12 months you don't like it, you can switch back to your old Medicare Supplement with no medical questions asked." Another client did exactly that this summer, out of an Advantage plan and back onto a Supplement on his trial right, on schedule. The right is real. It is also once.

The other doors, and how narrow they are

Outside the trial right, federal law opens the Supplement door only in specific situations: your Advantage plan leaves Medicare or stops serving your area, you move out of its service area, an employer, retiree, or COBRA plan that pays after Medicare is ending, your Supplement company goes bankrupt, or you were misled into a plan. Each comes with its own 63-day window. A rising premium is not on the list. Neither is a new diagnosis, which is the one people count on and the one that is never there.

What Nevada has that Arizona does not

This is where the two states our advisors serve split. Nevada adopted a birthday rule, effective January 1, 2022. Every year, starting the first day of your birthday month and running at least 60 days, someone who already has a Supplement can switch to another Supplement with the same or lesser benefits, from any company, with no health questions and no rate-up. It is a door for shopping, and it is a big deal if your premium has climbed. Notice what it is not: it does not open the door from an Advantage plan. You have to already be holding a Supplement to use it.

Arizona has not adopted one. The state's own SHIP booklet says it plainly: outside the six-month window and a few specific situations, you are subject to medical underwriting, and "if you want to change plans in the future, there is no guarantee that you will be able to." In Arizona, once the first year passes, the choice you made at 65 is the choice you keep unless your health says otherwise.

For the record, Supplements are standardized, lettered A through N, and Plans C and F are closed to anyone new to Medicare since 2020, with D and G as the replacements. We covered the basics of underwriting in a shorter piece back in March, here.

What a Certified Medicare Planner® does differently

Before recommending an Advantage plan at 65, they ask the uncomfortable question out loud: if you wanted a Supplement in five years, could you pass the health questions? If the honest answer is no, that changes the recommendation today. They put the trial-right deadline on a calendar the day you enroll, not the day you get frustrated. For people already past it, they know every guaranteed-issue trigger and its 63-day window, and they watch for the ones that open on their own, like a plan leaving the area. In Nevada, they shop the birthday window every year. And they never let the switch-every-fall habit of Advantage plans fool anyone into thinking a Supplement works the same way.

If you are on an Advantage plan and your first year is not over yet, the clock matters this month. If it is over, the door is not necessarily locked, but you need someone who knows where the other keys are. The advisors are at 602-281-3898.

Friday, October 2. Foothills Library, Glendale, 10:30 AM. Mustang Library, Scottsdale, 2:30 PM. No cost. Register at 123easymedicare.com/medicare-workshop or call (877) 220-1089.

Healthcare in Retirement continues next week. If there is a corner of Medicare that has ever confused you, tell us, and it may be the next one we take apart.

This event is presented by 123EasyMedicare, a brand of American Retirement Advisors, an independent, private organization. It is not sponsored by, endorsed by, or affiliated with Medicare, the Centers for Medicare & Medicaid Services, the Social Security Administration, or any government agency. The libraries are not sponsors of, and are not affiliated with, this event. Educational only; not tax, legal, or insurance advice.

Disclaimer: This article is for educational purposes only. It is not sponsored, endorsed, or otherwise representative of Medicare or the federal Medicare program. American Retirement Advisors is not a government agency. For official Medicare information, visit medicare.gov or call 1-800-MEDICARE (1-800-633-4227).