You can leave a Medicare Advantage plan this fall any time you want. Whether a Medicare Supplement will accept you afterward is a different question, with a different answer.
Most people assume those two things travel together. They don’t. Fall enrollment lets you change nearly everything about your coverage, but there is no annual Medicare Supplement open enrollment. Below, we map every way into a supplement that skips health questions. We also show how to find yours before December 7.
Original Medicare means Part A and Part B, run by the federal government. A Medicare Supplement, also called Medigap, is a private policy that helps pay your share of those costs. If the parts still feel fuzzy, start with our guide to Medicare basics and choosing your coverage.
What Fall Open Enrollment Really Lets You Change
Medicare’s Open Enrollment runs October 15 through December 7. Changes take effect January 1. During that window you can:
- Switch from one Medicare Advantage plan to another.
- Join, switch, or drop a Part D prescription drug plan.
- Move from Original Medicare into a Medicare Advantage plan.
- Leave Medicare Advantage and return to Original Medicare.
That is real flexibility, and it’s worth using. The official Medicare Plan Finder now shows 2027 Advantage and Part D options. Medigap policies have a separate home in Medicare’s Medigap comparison tool.
As of February 2026, Medicare Advantage covered 55% of Utah’s Medicare population, according to healthinsurance.org’s Utah Medicare data. Many of those people like their plan and should stay put. If that’s you, our page on how Medicare Advantage plans work can help you review what you have.
Why There Is No Annual Medicare Supplement Open Enrollment
Medigap follows its own rules. Federal law gives you one protected window, called the Medigap Open Enrollment Period. It lasts six months. It starts the first month you have Part B and are 65 or older.
During those six months, an insurer must sell you any Medigap policy it offers. It can’t turn you down or charge more because of your health. Medicare.gov is plain about what comes next. This window happens once, and it does not repeat each year.
After it closes, insurers may use medical underwriting. That means they review your health history before deciding whether to accept you and what to charge. They can charge more, or they can decline you. That isn’t an insurer behaving badly. It is simply how the law treats this product.
So the yearly “Medicare Supplement open enrollment” many people picture doesn’t exist. What exists is a short list of protected doors.
The Four Doors Into Medigap Without Health Questions
There are four. The first is your own one-time Medicare Supplement open enrollment, which Medicare calls the Medigap Open Enrollment Period. The others are federal guaranteed issue rights, trial rights, and Utah’s birthday rule. A guaranteed issue right is a legal protection. When you have one, the insurer must sell you a policy and cover your existing conditions. It also can’t charge you more because of your health.
The table splits two of those doors into their separate situations. We built it from Medicare’s official guide, Choosing a Medigap Policy, and from Utah law. Please check our work against both.
| The door | Who it’s for | How long it stays open | Which Medigap plans |
|---|---|---|---|
| Medigap Open Enrollment Period | Anyone 65 or older who is newly enrolled in Part B | Six months from the month Part B starts. One time only. | Any plan the insurer sells in Utah |
| Guaranteed issue: your Advantage plan leaves Medicare or stops serving your area | Current Advantage enrollees who return to Original Medicare | From 60 days before your coverage ends until 63 days after it ends | Plan A, B, D, or G. Plan C or F only if you were eligible for Medicare before 2020. |
| Trial right: you joined Advantage when first eligible for Medicare at 65 | People in their first year in that plan | Leave within 12 months of joining. Apply from 60 days before until 63 days after coverage ends. One time only. | Any Medigap plan sold in Utah |
| Trial right: you dropped Medigap to try Advantage for the first time | Former Medigap holders in the plan less than a year | Same as the row above. One time only. | The policy you had before, if the same insurer still sells it. If not, the guaranteed issue plans above. |
| Utah birthday rule | Utahns who already hold a Medigap policy | 60 days beginning on your birthday, every year | A comparable or lower tier plan from your current insurer only |
| Other federal guaranteed issue situations | You move out of your plan’s service area, lose employer or union coverage that pays after Medicare, your Medigap insurer goes bankrupt, or your plan broke the rules or misled you | Generally no later than 63 days after your coverage ends | Plan A, B, D, or G. Plan C or F only if you were eligible for Medicare before 2020. |
Our Medicare Supplement plans page explains how these policies work alongside Original Medicare.
If Your Advantage Plan Is Ending for 2027
This is the most urgent door, so it gets its own section. In August we warned that some Medicare Advantage plans would not exist in 2027. Here is the follow-through.
If your plan leaves Medicare or stops serving your county, you have a federal guaranteed issue right. It applies only if you return to Original Medicare. Joining another Advantage plan does not trigger it.
This clock runs in days, not months. Per Medicare’s guide, you can apply as early as 60 days before your coverage ends. You must apply no later than 63 days after it ends. For a plan ending December 31, that lands in early March. If your notice lists a date, treat that date as your deadline.
Check your fall mail for the words “terminating,” “non-renewal,” or “will not be offered.” Your own letter is the reliable source. A national headline can’t tell you what is happening in your county.
Then keep the paperwork. Medicare says you’ll need to give the insurer proof of your situation. Save the notice, any emails, and the postmarked envelope. A valid right is hard to use without them.
Guaranteed Issue Does Not Mean Any Plan
Here is the limit almost nobody mentions. A guaranteed issue right opens a specific menu of plan letters. It does not open the whole catalog.
Medicare’s current guide lists that menu as Plan A, B, D, or G. If you were eligible for Medicare before January 1, 2020, Plan C or F may also be available. If you became eligible on or after that date, they are not.
Plan N, a common choice, is not on the federal list. An insurer may offer more than the law requires, but it doesn’t have to. Utah’s Insurance Department also lists Plans K and L, so ask each insurer which letters it will issue.
This question comes before choosing a letter, even though we wrote about that first. Once you know your menu, our comparison of Plan G, Plan N, and High-Deductible G helps you choose within it.
Trial Rights: A Twelve-Month Way Back
Two situations create a trial right. Both let you try Medicare Advantage and change your mind.
First, say you joined an Advantage plan when you first became eligible for Medicare at 65. If you return to Original Medicare within the first year, you can buy any Medigap policy sold in Utah.
Second, say you dropped a Medigap policy to try Advantage for the first time. If you leave within a year, you can get that policy back, provided the same insurer still sells it. If it doesn’t, the federal menu above applies.
Both are one-time rights. Use one, return to Advantage later, and there is no second trial. The nonprofit Medicare Interactive has a plain-language summary of these protections.
Utah’s Birthday Rule, and What It Doesn’t Do
Utah added a state-level door in 2025. Under H.B. 258, effective May 7, 2025, each year brings a 60-day window that begins on your birthday. In it, your insurer must let you move to a different plan. It can’t deny you through medical underwriting.
Now the limits. The new plan must come from your current insurer. It must be a “comparable or lower tier plan,” in the statute’s words. So you can’t upgrade, and you can’t change companies.
States such as California and Nevada let you change carriers under their birthday rules. Utah’s version is narrower. Moving the same lettered plan to a lower-priced company still requires underwriting here.
The rule helps if you’re paying for more plan than you need. It is not a yearly Medicare Supplement open enrollment. Per AHIP figures, 81,726 Utahns held Medigap policies in 2023, so this limit affects many households. To compare prices on your own, the Utah Insurance Department’s Medicare page links to its premium comparison tool.
What Underwriting Actually Looks Like
Outside those doors, you can still apply. Expect questions about your health history, current medications, recent hospital stays, and pending procedures.
Approval is common. Many people in ordinary health get through without difficulty, so please don’t assume a no. A reader who expects a denial may never ask.
Still, it is a real review with a real chance of a no. So do it deliberately, before you change anything else.
The Rule That Prevents the Worst Outcome
Never drop your existing coverage until you have the new policy’s approval in writing.
Here is the trouble that sentence prevents. Someone leaves an Advantage plan in November, feeling good about the decision. In January they learn that no supplement will accept them.
The order is the fix. Medicare’s guide notes that you can apply for Medigap while you’re still in your Advantage plan. Ask for the new policy to start the day your old coverage ends.
Two Things to Weigh Honestly
Cost comes first. A Medigap policy usually costs more each month than an Advantage plan. Many Advantage plans charge low or no premiums. You would also need a standalone Part D drug plan. Our post on the Part D changes coming in 2027 covers that cost.
Second, neither path is the wrong one. Plenty of people do well in Medicare Advantage for years. This post is about keeping your ability to change your mind. It is not about which product wins.
If You’re Under 65 and on Medicare in Utah
Your position is harder, and we won’t pretend otherwise. Federal law generally doesn’t require insurers to sell Medigap to people under 65. Most states have added some protection. Utah has not, and a 2026 bill to change that did not advance.
As of June 2026, healthinsurance.org found one insurer on Medicare’s tool selling to Utahns under 65. You will also get the full six-month window when you turn 65. Until then, this deserves a conversation, because we can’t promise a fix.
Deadlines and the Takeaway
December 7 is the deadline for Advantage and Part D changes. Guaranteed issue windows run on their own clocks, and some of them close sooner. Since there is no annual Medicare Supplement open enrollment, the safe order is simple. Find your door first, then decide.
Find Out Which Door Is Yours
Medicare Supplement open enrollment rules are hard to work out alone. Does your situation trigger a protected window? How long does it last? Which plan letters does it open? What happens to your drug coverage if you move? We’ll map those answers with you before you change anything.
The review costs nothing. Staying put is a perfectly good outcome. And nobody should drop coverage before they hold a new policy’s approval in writing.
Book a free review of your guaranteed issue rights and we’ll walk through it at your pace. You can also see how we help on our Medicare services page.
Groberg Insurance Advisors is a licensed independent insurance agency in Utah. We are not connected with or endorsed by the United States government or the federal Medicare program. This is an advertisement and a solicitation for insurance. We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.
Medigap availability, pricing, and underwriting practices vary by carrier and are subject to change. Guaranteed issue eligibility depends on individual circumstances that can only be confirmed through an application. Nothing in this post states or implies that you will be approved for any policy.
