Speak with a licensed insurance agent

1-888-891-0229

Medicare Supplement Pre-Existing Conditions: Waiting Periods and Your Rights

Reviewed by Russell Noga, Licensed Medicare Insurance Broker (all 50 states) — Last updated October 24, 2026

Key Takeaway

A pre-existing condition can’t stop you from getting a Medicare Supplement plan during open enrollment or with a guaranteed issue right. The only catch is a possible waiting period of up to 6 months.

If you have diabetes, a heart condition or another health issue, you may worry that no company will sell you a Medicare Supplement plan. The truth is that timing matters more than your health history. Here is how pre-existing condition Medicare Supplement insurance rules work and how to get covered without a gap.

Compare Medicare Supplement plans in your area

Speak with a licensed insurance agent

1-888-891-0229

What Counts as a Pre-Existing Condition?

Medicare Supplement pre-existing conditions 6-month look-back period before your policy starts

A pre-existing condition is a health problem you had before your new Medicare Supplement policy starts. For the waiting period, a company can only look back at conditions you were diagnosed or treated for in the 6 months before your coverage begins.

✔
Diabetes, high blood pressure or high cholesterol
✔
Heart disease, a past heart attack or stroke
✔
COPD, asthma or other lung conditions
✔
Cancer you are being treated for or recently finished treating

Having one of these does not mean you can’t get a plan. What matters is when you apply, which is why your Medicare Supplement open enrollment window is so important.

How the Pre-Existing Condition Waiting Period Works

Medicare Supplement pre-existing condition waiting period: no prior coverage 6 months, 3 months coverage 3 months, 6 or more months no wait

Even during open enrollment, a company can make you wait up to 6 months before the new policy pays its share for a pre-existing condition. During that time, Original Medicare still pays its part, and the policy covers everything else right away.

You can shorten or skip the wait with creditable coverage. That is other health coverage you had before, such as an employer plan or individual health insurance. Each month you had it counts against the waiting period, as long as you did not go more than 63 days without coverage.

Good to know: If you had at least 6 months of creditable coverage right before your Medicare Supplement policy starts, the company cannot make you wait at all.

When Your Health Doesn't Matter

Your situation Can they deny you? Waiting period?
Medicare Supplement open enrollment No Up to 6 months, less with prior coverage
Guaranteed issue right No No
Outside both windows Yes, in most states Possible

Your open enrollment period is the 6 months that start the month you are 65 or older and enrolled in Part B. Guaranteed issue rights apply in special cases, such as losing employer coverage or your plan leaving your area.

Ready to apply? Follow our step-by-step guide on how to sign up for Medigap.

State rules: New York and Connecticut let you buy a Medicare Supplement plan any time of year without health questions. California and Oregon give you a yearly window around your birthday to switch plans.

How to Apply With a Pre-Existing Condition

Medicare Supplement open enrollment window: no health questions in months 1 to 6, health questions in most states after month 6
1
Check your window. Find out if you are in open enrollment or have a guaranteed issue right.
2
Gather proof of prior coverage. A letter from your old plan can shorten or remove the waiting period.
3
Compare companies. Prices for the same plan letter vary a lot, so compare the best Medicare Supplement companies in your area.
4
Answer health questions honestly. If you are outside both windows, a wrong answer can cancel your policy later.
5
Keep your current coverage. Don’t drop it until the new policy is approved. Use your Medicare Supplement free look period to review it.

The Bottom Line

A pre-existing condition matters less than when you apply. Buy during open enrollment or with a guaranteed issue right and you can’t be turned down, and a licensed insurance agent can find companies that may approve you outside those windows, at no cost.

Get help applying with a health condition

Speak with a licensed insurance agent

1-888-891-0229

Medicare Supplement Pre-Existing Conditions — Frequently Asked Questions

➤ Can I get a Medicare Supplement plan with a pre-existing condition?

Yes, in most cases. During your Medicare Supplement open enrollment period, or when you have a guaranteed issue right, a company cannot turn you down or charge you more because of your health.

➤ What is the pre-existing condition waiting period?

It is a period of up to 6 months when a new Medicare Supplement policy may not pay its share for a condition you were treated for in the 6 months before coverage started. Medicare still pays its part.

➤ How do I avoid the waiting period?

Have at least 6 months of creditable coverage, such as employer or individual health insurance, with no break longer than 63 days. Each month of prior coverage shortens the wait by a month.

➤ Is there a waiting period if I have a guaranteed issue right?

No. When you buy a Medicare Supplement plan with a guaranteed issue right, the company cannot make you wait for coverage of a pre-existing condition.

➤ Can a Medicare Supplement company deny me after open enrollment?

Yes. Outside your open enrollment period and without a guaranteed issue right, most companies can ask health questions and may deny you or charge more, unless your state has extra rules.

➤ Can a licensed agent help if I have health conditions?

Yes. A licensed insurance agent can tell you which window you are in, check which companies may approve you and help you apply, at no cost to you.

Free Medigap Price Comparison

Call a Licensed Agent Now

Compare Plan G, Plan N and more from several insurance companies in one call.

☎ 1-888-891-0229

No cost, no obligation to enroll

Compare plans & benefits in your area

Or speak with a licensed insurance agent

1-888-891-0229

MedigapWise
ZRN Health & Financial Services LLC
1200 Lakeway Drive #17A
Austin, TX 78738

About Us | Editorial Standards | Contact Us | Privacy Policy | Terms & Conditions

MedigapWise.com is not affiliated with or endorsed by the U.S. government, Medicare, Medicare.gov, or the Centers for Medicare & Medicaid Services.

© 2026 ZRN Health & Financial Services LLC. All Rights Reserved.


This website and the Medicare Supplement insurance plans referenced on it are not connected with or endorsed by the U.S. government or the federal Medicare program. Medicare Supplement (Medigap) insurance is sold by private insurance companies. MedigapWise.com is a website owned and operated by ZRN Health & Financial Services, LLC, a Texas limited liability company and licensed insurance agency. We do not offer every plan or insurance company available in your area; any information we provide is limited to the plans and companies we represent. Plan availability, benefits and premiums vary by state, age, gender, tobacco use, ZIP code and insurance company, and are subject to underwriting where permitted by law. Rates and figures shown on this site may reflect 2026 data and are for informational purposes only; your actual premium will be determined by the insurance company. You must continue to pay your Medicare Part B premium. Medicare Supplement plans are not Medicare Advantage plans and do not include prescription drug coverage. By submitting your information in the form, you agree to this site's privacy policy and expressly consent to be contacted at the number entered in the form (including a wireless number if provided) by licensed insurance agents or other partners offering related products that may be of interest to you, by phone, email or text. You understand that these calls may be generated using an automatic telephone dialing system, a pre-recorded message or artificial voice, or by sending SMS messages. Your telephone company may impose additional charges for such messages. You understand that you are not required to provide this consent to purchase goods or services. Receiving quotes through our website is always free, and you are under no obligation to purchase any goods or services as a result of this request. For information on all of your Medicare options, contact Medicare.gov or 1-800-MEDICARE (TTY users should call 1-877-486-2048) 24 hours a day, 7 days a week, or your local State Health Insurance Assistance Program (SHIP).