If you're buying a Medigap policy with a health condition on record, federal law caps what an insurer can do with it: the pre-existing-condition waiting period lasts at most six months. And if you buy during your six-month Medigap Open Enrollment Period at 65 or older, with six months of steady coverage behind you, there may be no wait at all. Here's when it applies and when it disappears.

In This Guide

What the Medigap Pre-Existing Condition Rule Actually Says

A Medigap policy, also called Medicare Supplement insurance, is private coverage that pays some of the out-of-pocket costs Original Medicare leaves you with. The worry a lot of people bring to it is simple: I've got a condition already, so will the insurer just refuse to cover it? Federal law puts firm limits on what that condition can do.

Here's the core rule. Under Section 1882 of the Social Security Act, a Medigap insurer can hold back coverage for a pre-existing condition only during the policy's first six months. That's the ceiling. Once six months have passed, the policy has to cover that condition like any other. There's no such thing as a Medigap plan that excludes your condition for a year, or forever. The federal cap is six months, full stop.

And it gets narrower than that. The insurer can only apply the wait to a condition you actually got treatment for, or were diagnosed with, during the six months right before the policy took effect. That six-month window is the look-back. So a condition you haven't seen a doctor for in the last six months falls outside it. The rule is aimed at recent, active conditions, not at everything in your medical history.

One thing the wait doesn't reach: it applies to the Medigap policy's benefits for that specific condition, and only for those first six months. It's the supplement's share that can be held back for a while, not a permanent exclusion.

How Prior Creditable Coverage Erases the Waiting Period

Now the part that matters most for a lot of people, because it often makes the whole waiting period vanish.

If the policy is issued during your six-month Medigap Open Enrollment Period, you're 65 or older on the date it's issued, and you had at least six months of continuous creditable coverage before you applied, the insurer can't make you wait at all. No six-month hold, no look-back, nothing. The policy covers your pre-existing condition from day one. The federal waiver is written against that window, so if you're buying outside it, don't count on this protection.

So what's "creditable coverage"? According to Medicare's own Medigap guide, it's basically any other health coverage you had recently before applying. Plenty of common situations count. If you were on a job's health plan, or a spouse's, that's coverage. If you're switching from a Medicare Advantage plan back to Original Medicare plus Medigap, that time counts too. The point is that most people arriving at Medigap aren't coming from nowhere. They're coming off something, and that something usually does the job.

There's one catch to the word "continuous," and it's a specific number. Your earlier coverage only counts as continuous if any break in it was no more than 63 days. Go a single day past 63 without coverage and that stretch may not count. So if you're between plans, the practical move is to not let a gap drag on. Line up the Medigap policy before the old coverage lapses, or at least keep the gap short.

Put those rules together and here's the happy path most people are actually on: buying during Open Enrollment at 65 or older, six-plus months of prior coverage, no long gap, and the waiting period simply doesn't exist for you.

When a Medigap Pre-Existing Condition Waiting Period Can Still Apply

So when does the six-month wait actually bite? Mostly in three situations. The first is when you're new to having health coverage, or you had less than six months of it before applying. The second is when there was a break in your prior coverage longer than 63 days, so it doesn't count as continuous. The third is when the policy is issued outside your Medigap Open Enrollment Period, or before you turned 65, because the federal waiver is written for policies issued in that window. In either case, the insurer is allowed to apply the wait, but remember the limits: at most six months, and only to a condition treated or diagnosed in the six months before the policy started.

There's also a point that trips people up, because it sounds like it should solve everything and it doesn't quite. During your Medigap Open Enrollment Period, the six-month window that opens when you're 65 and enrolled in Part B, insurers have to sell you any policy they offer, and they can't use your health to turn you down or charge you more. That's a real protection, and it's the one most people use.

What it isn't is the same thing as a guaranteed issue right, and the difference is exactly the waiting period. Inside your Open Enrollment Period, an insurer may still hold back coverage for a pre-existing condition for up to six months. Under a true guaranteed issue right, which is a separate protection that applies in its own specific situations, the insurer has to cover all of your pre-existing conditions with no waiting period at all. So Open Enrollment answers whether the insurer must sell you the policy, and at what price; the waiting period is about how soon that policy starts paying for a condition you already had. Two separate rules.

The good news is that the creditable-coverage rule still does its work inside your Open Enrollment Period: if you show up to it with six or more months of prior coverage behind you, there's no waiting period either. For most people using their Open Enrollment window, both boxes get checked at once.

Frequently Asked Questions

Does Medigap cover pre-existing conditions?

Yes. A Medigap insurer can delay coverage for a pre-existing condition for at most six months, and only for a condition you were treated for or diagnosed with in the six months before the policy started. After that, the policy covers it like anything else. If the policy is issued during your six-month Medigap Open Enrollment Period at 65 or older and you had six or more months of continuous creditable coverage, there's no waiting period at all.

How long is the Medigap waiting period?

The federal maximum is six months. An insurer can't make you wait longer than that for a pre-existing condition, and for a policy issued during your six-month Medigap Open Enrollment Period at 65 or older, prior creditable coverage can shorten or eliminate the wait entirely.

What counts as creditable coverage for Medigap?

Medicare's Medigap guide describes it as, generally, any other health coverage you had recently before applying, such as a job-based health plan or a Medicare Advantage plan. It only counts as continuous if any break in it was 63 days or less.

Can a Medigap insurer deny me for a pre-existing condition?

During your six-month Medigap Open Enrollment Period, no. Insurers must sell you any policy they offer and can't use your health to deny you or raise your price. That protection is separate from the pre-existing-condition waiting period, though: inside Open Enrollment an insurer may still delay coverage of a pre-existing condition for up to six months, unless you had at least six months of continuous creditable coverage. A guaranteed issue right is the stronger, separate protection. Under one, the insurer must cover your pre-existing conditions with no waiting period.

I had a gap between plans. Does my old coverage still count?

It depends on how long the gap was. Prior coverage counts as continuous only if the break was no more than 63 days. A shorter gap is fine; a longer one may mean the earlier coverage doesn't count toward erasing the waiting period.

Learn More

MedicareMedigap (Medicare Supplement): How the Lettered Plans WorkMedigap (Medicare Supplement) explained: how the standardized A-N plans work, Plan G vs Plan N, closed C and F plans, and the 6-month guaranteed-issue window. MedicareMedigap Guaranteed Issue Rights: When an Insurer Must Sell You a PolicyMedigap guaranteed issue rights are federal situations where an insurer must sell you a policy, no health questions. See the triggers and the 63-day deadline. MedicareWhen Is the Medigap Open Enrollment Period? The One Window That MattersYour Medigap Open Enrollment Period is a one-time, 6-month window that starts when you're 65 and on Part B. Buy inside it or you may be turned down later. MedicareCreditable Drug Coverage and the Part D Late PenaltyWhat creditable prescription drug coverage means, the 63-day rule, what counts, and how to avoid the Medicare Part D late enrollment penalty in 2026. MedicareWhen to Sign Up for Medicare: Enrollment Periods and Late PenaltiesWhen to sign up for Medicare without a lifelong penalty: the 7-month Initial Enrollment Period, working past 65, the GEP, and what each late penalty costs. MedicareSuspending Your Medigap Policy When You Qualify for MedicaidIf you get Medicaid, you can suspend your Medigap policy for up to 24 months instead of dropping it, then reinstate it later with no new medical underwriting.

Find personalized help working out whether a Medigap waiting period would apply to your situation at brevy.com.

The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.

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Brevy Care Team

Expert eldercare guidance from Brevy's team of healthcare professionals and researchers.