Medigap insurance usually covers pre-existing health conditions but not always. Learn what and when prexisting conditions are covered (and not) and how to get approved even with a medical condition on your record.

During Your Medigap Initial Open Enrollment, Pre-Existing Conditions Can’t Be Used Against You

Your Medigap Open Enrollment Period is a one-time, six-month window that starts the first month you are 65 or older AND enrolled in Medicare Part B. During this time, an insurance company cannot refuse to sell you any policy it offers, cannot use medical underwriting to deny you, and cannot charge you more because of a pre-existing health problem. Source: Medicare.gov.

This window does not repeat every year (it is NOT the same as AEP Medicare enrollment period from Oct 15-Dec 7). For most people turning 65, applying during these six months is the best way to lock in coverage with no health questions. If you are new to this, our guide for people new to Medicare walks through the timing.

The Pre-Existing Condition Waiting Period (And How Prior Coverage Removes It)

There is one exception even inside you Medigap Open Enrollment when you could be subject to a waiting period. A carrier can refuse to cover out-of-pocket costs tied to a pre-existing condition for up to six months after your policy starts only if you had a gap of health coverage six months before enrolling. A pre-existing condition specifically means one that was diagnosed or treated in the six months before your Med-supp coverage began (the “look-back period”). Source: Medicare.gov.

During that waiting period Original Medicare still pays its normal share for the condition but Medigap wont. If you had at least six months of prior “creditable coverage” (such as an employer group plan or other qualifying health coverage) before enrolling, this waiting period will not apply to you. Also, if you had creditable coverage for only 3 months, your waiting period will be reduced by those 3 months (leaving you with a 3-month waiting period instead of 6). To make sure you avoid a waiting period, apply no more than 63 days after your old coverage ends.

📌 Note: The Medsup waiting period only ever applies to the specific pre-existing condition for those with gaps in their prior coverage. Everything else your Medigap plan covers is in effect from day one. So if you get injured on your first week of Medigap, everything associated with that injury would be covered.

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What Happens If You Apply for Medigap Outside Open Enrollment?

In most states the carrier can ask about your health through medical underwriting if you apply outside your initial open enrollment period. That means answering roughly 20 health questions (no physical exam) and agreeing to let the company review your records. Based on your answers, a carrier can approve you at its best rate, approve you at a higher rate, or decline you.

Underwriting sounds intimidating, but qualifying is easier than most people expect, and you can apply any time of year. Mild or well-controlled conditions (think managed high blood pressure, or a surgery several years back that is fully healed) often get approved at the best rate. Carriers differ a lot too: it is common for one company to decline someone that another approves for the same condition. Our Instant Medigap Underwriting Checker lets you test your conditions anonymously before you ever talk to anyone.

And just like section above, if you are approved via underwriting you may still be subject to a waiting period for pre-existing health conditions for up to 6 months if you have had a gap in credible coverage before enrolling.

Which Pre-Existing Conditions Most Affect Medigap Approval?

When you are underwritten, some conditions rarely cause a problem while others are common automatic declines. The lists below are general patterns, not a verdict on any one person, since each carrier sets its own rules.

Often approved at the best rate:

  • Well-controlled high blood pressure or high cholesterol
  • Past surgeries that have fully healed (often 2 or more years out)
  • Stable, treated conditions with no recent changes in medication or symptoms
  • Stroke over two years ago where you are now symptom and treatment free.

Frequent automatic declines:

  • Currently engaged in physical therapy.
  • Recent cancer (commonly within the last 2 to 5 years)
  • Chronic kidney disease
  • Any test or procedure that has been recommended but not yet completed

💡 Tip: Approval varies by insurance carrier. Call our team at Senior65 at 800-930-7956 and we can check specific carrier guidelines in your state after you review our Instant Medigap Underwriting Checker.

Guaranteed Issue Rights: When Pre-Existing Conditions Don’t Matter at All

In certain situations you have “guaranteed issue rights,” meaning a carrier cannot deny you or charge more because of your health even outside Open Enrollment. These typically arise when you lose other coverage through no fault of your own, such as an employer plan ending, a Medicare Advantage plan leaving your area, or a Medigap trial right. A few states also run their own year round Medigap enrollment and free switching windows.

Guaranteed issue rules vary by state and situation, so it is worth confirming yours. See our overview of Open Enrollment versus guaranteed issue to find where you stand.

How to Switch Medigap Plans When You Have a Pre-Existing Condition

If you already have a Medigap plan and want a different one, medical underwriting is your main path, and it is available any month of the year. There is no federal annual window that lets you switch Medigap plans without a health review, so the realistic question is simply whether you will pass underwriting with this carrier. Enter your health condition or current prescription drugs through our instant Medigap Underwriting Checker first, then compare Medigap prices.

A secondary option exists in a handful of states: birthday-rule and anniversary windows let you move from one Medigap plan to another without underwriting for a limited time each year. These apply to Medigap-to-Medigap switches only (they do not let you move from Medicare Advantage into Medigap without underwriting). Check the Birthday Rule state guide to see if your state offers one. Our full Medicare switching guide and the dedicated piece on switching Medigap plans has more info as well.

Get a Straight Answer on Your Situation

Pre-existing conditions don’t have to close your door on Medigap. Depending on your enrollment timing, your state, and which carrier you apply to, many people with preexisiting health conditions can be approved for Medigap. Our team at Senior65 can look up each carrier’s guidelines in your state and point you to the plan most likely to approve you. Our help is always free, and by law no one can offer you a lower price on the same plan.

Get an instant Medigap quote in 30 seconds, or call 800-930-7956 to talk through your conditions with our team before you apply.