Publication time reported by BabyLoveGrowth, shown in Mountain time. This is not an independently measured first appearance on this website.

How to Switch Medigap Plans Without Losing Coverage

Older adult comparing Medigap policy packets

You can switch Medigap plans, but in most cases the new insurer can ask health questions first and say no. Federal law protects your right to switch only in a few situations. These are your 6-month Medigap Open Enrollment Period, a handful of guaranteed issue rights, and a trial right if you are leaving Medicare Advantage. Outside those windows, switching depends on your health and on the rules in your state. Below is how each path works, what to check before you cancel anything, and how to avoid paying more over time.

SimplyinsuranceforyouCompare Medigap Options With GuidanceSimply Insurance offers personalized, independent guidance to help you compare Medicare plans and navigate coverage decisions with confidence.Visit Simply Insurance

TL;DR

Federal law gives you a guaranteed right to switch only during your 6-month Medigap Open Enrollment Period or in specific situations. Being unhappy with your premium is not one of them.
Outside those windows, a new insurer can use medical underwriting. It may charge more or decline you.
If you are leaving Medicare Advantage, you may have trial rights, but they are time-limited.
Never cancel your old policy until the new one is approved and in force.
The cheapest premium today is not always the cheapest premium in five years. Ask about the rate history.

What “switching” means with Medigap
The windows when you can switch without health questions
If you don’t qualify for a guaranteed window
Leaving Medicare Advantage for Medigap
A step-by-step way to switch safely
Is the cheaper plan really cheaper?
Our perspective
Get a second opinion before you cancel
What if you move to another state?
FAQ
Sources

What “switching” means with Medigap

A Medigap policy, also called Medicare Supplement, fills in some of what Original Medicare leaves unpaid. Each lettered plan has the same benefits no matter which company sells it. Plan G from one carrier covers the same things as Plan G from another. The price is the only difference between them.

That shapes the reasons people switch:

The premium went up. This is the most common reason by far.
Your needs changed. You want more coverage, or you can live with less.
You are leaving Medicare Advantage. You want to go back to Original Medicare with a supplement.
You moved. Your insurer may not sell in your new area.

Switching between carriers for the same letter is a price decision. Switching from one letter to another is a coverage decision. They have different rules in practice, so decide which one you are doing first.

The windows when you can switch without health questions

Medicare says that in most cases you can’t switch Medigap policies outside your 6-month Medigap Open Enrollment Period except in specific situations. The page also notes that its answers cover federal rights only, so state rules can add to them.

Your Medigap Open Enrollment Period

This is a one-time 6-month window. It starts when you are 65 or older and enrolled in Part B. During it, any insurer selling Medigap in your state has to sell you a policy at the standard rate, whatever your health. If you are about to turn 65, this is the best moment to choose carefully, because it is the one time everyone is guaranteed a choice. Our guide to Medicare Part A and Part B explains how Part B enrollment triggers it.

Guaranteed issue rights

The Colorado Division of Insurance Medigap guide explains that outside your initial enrollment period there are several situations where you may still have a guaranteed issue right to buy a policy. Typical examples include losing other coverage through no fault of your own, or moving out of your plan’s service area. Each right has its own deadline, often measured in days from the event, so check the dates before you act.

State birthday and anniversary rules

A number of states let current Medigap holders switch once a year, around their birthday or policy anniversary, without underwriting. Details differ by state. Some limit you to equal or lesser benefits, and the length of the window varies. The National Association of Insurance Commissioners keeps a state-by-state chart of these rules. Colorado’s rules differ from those in states with a well-known annual window, so don’t assume you have one. Confirm with the Division of Insurance guide above, or ask us before you plan around a date.

State birthday and anniversary rules — overview diagram

If you don’t qualify for a guaranteed window

You can still apply. Medicare notes that you can often apply at any time, but the insurer may use medical underwriting and could decline you or charge more. Underwriting generally means health questions on the application. Some carriers also review pharmacy records.

Two practical points:

Healthy applicants often do fine. If you have no major conditions, an application outside a guaranteed window can succeed. Your health history decides it, not just the calendar.
Declined does not mean you lose coverage. You simply stay on your current policy. That is why you should apply for the new one before touching the old one.

Switching to a plan with fewer benefits is usually easier to get approved than moving up to a richer letter. Insurers worry most about someone adding coverage right when they expect to need it.

Leaving Medicare Advantage for Medigap

You generally can’t have both a Medicare Advantage plan and a Medigap policy. If you want Medigap, you return to Original Medicare. Whether you can buy a supplement without health questions depends on trial rights.

Medicare describes trial rights as applying when you joined Medicare Advantage for the first time and are within 12 months of joining, or when you dropped a Medigap policy to join Advantage for the first time. Miss that window and you will likely face underwriting. We cover the trade-offs in our Medicare Advantage vs. Medigap explainer, and there is a Castle Pines-specific version in this comparison guide.

Two cautions for people making this move:

Time your Medicare Advantage disenrollment and your Medigap start date to match, so there is no stretch with neither.
Your prescription coverage changes too. Medigap policies don’t include drug coverage, so you will need a standalone Part D plan.

If a particular medication is part of why you are changing, it helps to understand how Medicare treats it first. For example, coverage of GLP-1 drugs for weight loss is a common question, and this overview of Medicare coverage for weight loss drugs explains who qualifies.

A step-by-step way to switch safely

Pin down your current benefits. Write down the plan letter, your premium and the rating method (more on that below).
Decide whether you are changing carrier or letter. If you are staying with the same letter, you are shopping on price and service alone.
Check which window applies. Open Enrollment, a guaranteed issue right, a trial right, or none. If none, expect underwriting.
Get quotes for the same letter from several carriers. Premiums are not set by federal rule, and for the same plan the price difference can be large.
Apply for the new policy and wait for approval in writing. Confirm the effective date.
Only then cancel the old policy, and time the cancellation to the new start date.
Use the 30-day free look. After you buy, you have 30 days to decide whether to keep it. You may owe premiums on both policies during that window, so ask your agent how it applies to your new carrier.

Is the cheaper plan really cheaper?

Price shopping is the right instinct, but the sticker price is only part of it. Medigap premiums are priced in one of three ways, which Medicare calls issue-age, attained-age or community rated. Each behaves differently as you age.

Rating method How the premium is set What to watch Community-rated Same for everyone regardless of age Usually rises with inflation and claims, not with your age Issue-age Based on the age you were when you bought Starts lower if you buy younger; still rises with inflation and claims Attained-age Based on your current age Cheapest at first, then climbs as you get older

Before you switch, ask each carrier for the rate history of the plan block you would join: how much it rose in the last several years. A new, low-priced block can look attractive and then rise faster. That is a risk with annual switching in general, because Medigap does not get the risk-adjusted payments that Medicare Advantage plans do, which the NAIC’s Senior Issues Task Force has discussed in its May 2026 meeting minutes. A carrier with more stable rates may be worth a slightly higher premium.

Our perspective

Most people who call us about switching come in annoyed about a rate increase. Our first question is not “which plan is cheapest.” It is “what happens if your health changes in two years?” Medigap’s biggest strength is free choice of any doctor or hospital that takes Medicare, without referrals or prior authorization, as the Colorado Division of Insurance stresses. The cost of switching is that you may give up the protections you earned when you first enrolled.

So we look at three things before recommending a move:

Whether you are inside a guaranteed window, because that changes how much risk you carry.
How the new carrier’s rates have behaved, not just its first-year price.
Whether you are comfortable with the trade-off if the move is toward Medicare Advantage: lower premiums and extras like dental or vision against a network.

We are independent and work across multiple carriers, so we can quote the same letter side by side. We also stay with you after enrollment, with annual reviews and help with claims, because the right plan today may not be the right plan next fall.

— Zach

Get a second opinion before you cancel

If you are weighing a switch, we can compare your current policy with other carriers for the same letter, check which enrollment rights apply to you, and tell you plainly if staying put is the smarter move. Start with our Plan G and Plan N quote page or see all of our Medigap plans in Castle Pines. We serve all of Colorado, including Denver. Our service doesn’t cost you anything: carriers pay us when you enroll.

What if you move to another state?

A move can be one of the qualifying events. Medicare lists moving out of your plan’s service area among the situations that can give you a guaranteed right, as covered on its switching page. If your carrier also sells in your new state, you may be able to keep your policy, though your premium can change because rates depend on location. Ask the carrier before you move rather than after, and get the answer in writing.

FAQ

Can I change my Medigap plan at any time?

You can apply at any time, but you only have a federal right to be accepted during certain windows. Outside them, the insurer can ask health questions and decline you or charge more. Your state may add protections, so check your state’s rules.

Can I switch from one Medigap letter to another with the same company?

Yes, you can ask. Without a guaranteed right, the company can still require underwriting for a switch, especially to a richer plan. A move to a plan with fewer benefits is generally easier to get approved.

Will I have to pay for two policies at once?

Possibly for a short time. You have 30 days to decide whether to keep a new policy, and you may owe premiums on both during that window. Keeping the old policy until the new one is confirmed is the safest approach.

Can I go back to Medigap after joining Medicare Advantage?

Only without health questions if you have trial rights, such as being within 12 months of first joining Medicare Advantage. Otherwise you will likely go through underwriting, and a decline would leave you on Original Medicare without a supplement.