Medigap Medical Underwriting: What Insurers Ask and How They Decide

When Underwriting Does and Does Not Apply

Underwriting is not something every Medigap buyer goes through. Whether an insurer can look at your health depends on when and why you are applying.

It does not apply during your Medigap open enrollment period, the six months that begin when you are 65 or older and enrolled in Part B. During that window, the insurer must sell you any policy it offers, at its standard price for your category, regardless of your health. It also does not apply when you have a federal guaranteed-issue right, which arises after certain events such as your Medicare Advantage plan closing, your moving out of its service area, or a significant change to its network, the loss of employer or retiree coverage that supplemented Medicare, or the 12-month trial rights we describe in our post on Medicare Advantage trial rights. Some states add events of their own.

Underwriting does apply, in most states, when you try to change Medigap policies outside those windows or when you apply for the first time after your initial window has closed. That includes a person who has been in Medicare Advantage for years and now wants Original Medicare with a Medigap plan, as our post on switching back to Original Medicare describes. And it applies to people in Ohio who want to switch from one company or plan to another, because Ohio does not have an annual window that waives health questions. We cover the state-by-state picture in our post on why Medigap is not part of open enrollment.

What Insurers Ask

There is no single national form. Each insurer writes its own application and questions, so what one company asks may differ from the next. But most applications share a common structure.

You will be asked to confirm basic facts such as your age, your Medicare enrollment, and whether you currently have other coverage. Then comes the health section. Typically it is a set of yes-or-no questions about whether you have been diagnosed with, treated for or hospitalized for specific conditions, often within a certain number of years. Common areas include:

• Heart conditions, heart attack, stroke or circulatory problems
• Cancer, including treatment history and whether it is active
• Lung disease and oxygen use
• Diabetes, and whether it involves complications or insulin
• Kidney disease and dialysis
• Neurological conditions, including memory problems and dementia
• Mental health diagnoses and hospitalizations
• Recent hospital stays, surgeries, or planned procedures
• Use of mobility aids, home health care, or help with daily activities such as bathing or dressing
• Current medications

Some applications also ask whether you have been advised to have tests or surgery that has not yet been done. And some include a statement that you should not submit the application if you would answer yes to certain questions, which acts as a screening step before you even apply.

The look-back period, meaning how far back a question reaches, varies by insurer and by question. Some questions ask about the last few months, others about several years, and some insurers may reach back further for certain conditions. That variation is one reason a person turned away by one company may be accepted by another.

How Insurers Verify Your Answers

Do not assume the application is the only source of information. Insurers may check other records, and practices vary by company and are not set out in Medicare’s own guide, so ask each insurer what it does. Depending on the company, that can include a prescription history report that shows medications you have filled, the dosages and the dates. Some call applicants for a brief phone interview. Some request medical records from your doctors with your permission. Medicare’s guide also lists asking about your family history or requiring a genetic test as illegal practices for Medigap sellers.

These checks are one reason accuracy matters so much. Answering incompletely, or guessing, can create a mismatch between your answers and the records. And there is a larger risk. Medigap policies are guaranteed renewable, which means the insurer cannot cancel for health reasons, but it can cancel for material misrepresentation on the application. If an insurer proves that you gave false answers on something significant, it may have grounds to terminate the policy. Be accurate even where an answer is awkward. If you are unsure of a date or a diagnosis, ask your doctor’s office for your records before you apply.

The Possible Outcomes

Outcome	What it means for you
Approved at standard rate	You get the plan you applied for at the usual price for your category
Approved at a different rate	Some insurers and states allow higher premiums based on health
Waiting period	Pre-existing conditions may be excluded for up to six months
Declined	The insurer will not sell you that policy, though another may

An underwriting review generally ends in one of a few results.

Approval at the insurer’s standard rate. This is the result people hope for. You are accepted for the plan you requested, with the same pricing that applies to other applicants of your age and category.

Approval with a different rate or conditions. Some insurers can issue a policy at a higher premium based on your health. KFF’s review of insurer materials found that conditions such as diabetes without complications, bipolar disorder or osteoporosis treated by infusion can lead to higher premiums rather than a denial. Not every insurer or state works this way, so ask what the company’s practice is.

A waiting period for pre-existing conditions. Federal rules allow an insurer to delay coverage for a pre-existing condition for up to six months, and only for a condition that was diagnosed or treated in the six months before your policy starts. Original Medicare still pays its share of covered care during that time. You are exempt from that waiting period if you had other creditable coverage for the six months before applying, with no break of more than 63 days. Medicare’s guide says many types of health coverage can count as creditable coverage, as long as any break was no more than 63 days. Your Medigap insurer or your State Health Insurance Assistance Program can tell you whether your prior coverage counts.

Denial. Insurers can decline an application based on health. KFF’s review of insurer materials found that conditions listed as grounds for denial include Alzheimer’s disease, cancer, congestive heart disease, diabetes with complications and end-stage renal disease, among others, though lists differ by company. Needing help with daily activities can also lead to a decline.

An offer of a different plan. In some cases an insurer may decline the plan you requested but offer a different one. This depends on the company, so ask.

What a Decline Does and Does Not Mean

A denial is disappointing, but it is not the end of the road, and it does not mean something is wrong with you as an applicant. Underwriting rules differ among insurers. One company’s approval does not obligate another, and one company’s decline does not necessarily carry over, though some applications may ask whether you have been declined before. If you are declined, you may be able to apply to a different insurer, or the same insurer for a different plan.

Remember that being denied does not change your existing coverage. If you are in a Medicare Advantage plan, you stay in it. If you have a Medigap policy and were seeking a new one, you keep the one you have. That is why we recommend not canceling anything until the new policy is approved and has a confirmed start date in writing.

If Medigap is not available to you, there are other options to consider. You could stay in or shop for a different Medicare Advantage plan that suits your doctors and drugs, since Advantage plans cannot turn you away for health reasons during their enrollment periods. You may qualify for a Medicare Savings Program or Medicaid, which can help with cost-sharing. If you are a veteran or military retiree, you may have TRICARE For Life or VA benefits. We’re an independent agency, not affiliated with the VA, TRICARE, or the Department of Defense. And you can set aside funds for out-of-pocket costs as part of your financial plan, though you should talk to a financial professional about that.

Under 65 and Disabled: A Different Starting Point

People who receive Medicare because of a disability, before age 65, are treated differently by state law. Some states require insurers to offer at least one Medigap policy to them. Ohio’s Medicare supplement rule applies its open enrollment protections to people 65 and older and does not require insurers to sell Medigap to people under 65, and the National Association of Insurance Commissioners’ state chart (as of May 2026) reports no companies currently selling to the under-65 population in Ohio. If you are under 65 on Medicare, check how your state handles it, and keep in mind that your six-month window to buy Medigap with guaranteed issue begins when you turn 65 and have Part B. Our page on Ohio’s Medigap rules has more on this.

Practical Steps If You Expect Underwriting

None of these steps is a way to get around underwriting. They are about being prepared.

• Gather your information first. Make a list of diagnoses, medications, doses, hospital stays and dates, and ask your providers for records if you are unsure.
• Read the application questions carefully before you answer. A question that asks about “treatment” may be broader than one that asks about “hospitalization.”
• Find out whether you qualify for a guaranteed-issue right before you apply.
• Know your timing. If you are leaving Advantage, you may need the Medigap start date to line up with the end of your Advantage coverage.
• Do not cancel your current coverage until you have written confirmation of approval and the effective date.
• Use an independent agent, not tied to a single insurer, who can explain which questions each company asks and which plans may be available. They cannot overrule an underwriter, but they can save you from applying blindly.

If you have a spouse or caregiver helping you, include them. Underwriting forms and phone interviews can be stressful, and having another person take notes reduces mistakes. Our guide to Medicare for caregivers includes a section on supporting a loved one through coverage decisions.

How Underwriting Plays Out for Different Buyers

The same process feels very different depending on why you are applying.

Someone leaving Medicare Advantage without a guaranteed-issue right. This person is applying to move from a plan with a cost cap to Original Medicare, and the insurer is deciding whether to take on the risk. The health questions carry much of the decision. Medicare’s guide says you can apply before your Advantage coverage ends and that the insurer can sell the policy as long as you are leaving the plan. That gives you time to learn the outcome before you disenroll.

Someone already holding a Medigap policy who wants to change companies. The current policy is guaranteed renewable, so a decline does not put your coverage at risk. The question is whether the new insurer will accept you. If you have had your current policy for more than six months and the new policy has the same benefits, Medicare’s guide says the new insurer cannot exclude pre-existing conditions or impose a waiting period if it agrees to issue the policy.

Someone who skipped Medigap at 65 because they had other coverage. If that coverage ended and they have a guaranteed-issue right, no underwriting applies. If the coverage was something else, such as a plan they left voluntarily, the right may not apply. Ask the insurer to explain, and call your State Health Insurance Assistance Program if you are unsure.

Someone under 65 on Medicare because of a disability. Rules vary widely by state, and Medicare’s guide says you might not be able to buy the policy you want, or any Medigap policy, until you turn 65. Check your state’s rules before assuming anything.

A Step-by-Step Look at the Application Process

• Step 1: Confirm underwriting applies. Ask whether you are in an open enrollment window or have a guaranteed-issue right. If either is true, health answers cannot be used to deny you or change the price.
• Step 2: Ask the insurer whether it uses medical underwriting. Medicare’s guide suggests asking this question directly about the specific policy.
• Step 3: Prepare your health history. List diagnoses, treatments, hospital stays and medications with approximate dates. Ask your doctor’s office for records if you are unsure.
• Step 4: Complete the application carefully. Answer every question accurately and completely. Keep a copy.
• Step 5: Cooperate with any follow-up. An insurer may call, request records, or review prescription history.
• Step 6: Wait for the written decision. It may take a few days or longer depending on the company.
• Step 7: Compare the terms. If approved, confirm the plan, premium, start date and any waiting period in writing.
• Step 8: Time the change. Start the new policy when your old coverage ends, and do not cancel earlier coverage until you are sure.

Three Scenarios

These are hypothetical illustrations.

Picture an applicant with well-controlled diabetes and no complications. According to KFF’s review of insurer materials, diabetes without complications can lead to a higher premium at some insurers rather than a denial. The applicant might be approved with a different rate in a state that permits it, or approved at standard rate by another insurer. The point is that outcomes vary by company, so one answer is not the whole market.

Picture an applicant who had cancer treatment finished a few years ago. Whether the insurer asks about it depends on the question’s look-back period, which differs by company. The applicant answers the questions as written and does not guess about what an insurer will find.

Picture an applicant who left an employer retiree plan three weeks ago. That plan was ending, so a guaranteed-issue right may apply, and the applicant has 63 days after the latest of the key dates in Medicare’s guide. They keep the termination notice, apply promptly, and are not subject to underwriting.

Costly Mistakes to Avoid

• Leaving out a diagnosis or a medication. It can lead to a denial, and a policy can be ended if you were not truthful on the application.
• Canceling coverage before approval. Wait for written confirmation.
• Applying to many companies at once without a plan. You may lose track of timing, and some applications ask whether you have been declined before.
• Missing a guaranteed-issue window. If you had a right and let 63 days pass, you may find yourself in underwriting for the same policy.
• Assuming a decline is final. Another insurer may reach a different decision.
• Ignoring the waiting-period rule. A pre-existing condition may not be covered by Medigap for up to six months, even though Original Medicare still pays its share. Ask what you would owe in that gap.

What to Ask the Insurer

• Does this policy use medical underwriting for my situation?
• How far back do the health questions go?
• Will you check prescription history or request records?
• If approved, is the rate the standard one for my age, or a different rate?
• Is there a waiting period for pre-existing conditions, and does my other coverage count?
• When does the policy start, and what is the free-look period?

What to Do If You Are Declined

A decline can feel discouraging, but there are practical next steps. Ask the insurer to explain, in writing if possible, the reason for the decision. Check whether you actually had a guaranteed-issue right; if you did, Medicare’s guide says to call your State Insurance Department if you were denied in one of those situations. Talk with your State Health Insurance Assistance Program for free counseling, and ask whether a different company’s questions might produce a different result.

Then weigh your alternatives. You can stay in your current plan, switch to a different Advantage plan whose network suits you, look at a Medicare Savings Program if your income is limited, or revisit Medigap when a guaranteed-issue event or state window arises. None of these choices is a failure, and the best fit depends on your health, your budget and your doctors.

Frequently Asked Questions

What is medical underwriting for Medigap?

It is the insurer’s review of your health to decide whether to sell you a policy, at what price, and with what conditions. It applies in most states when you apply outside your open enrollment period and without a guaranteed-issue right.

Can a Medigap insurer deny me because of a pre-existing condition?

Yes, if you are applying under underwriting rules. During your initial open enrollment period or with a guaranteed-issue right, the insurer cannot deny you or charge more because of your health.

Do Medigap insurers check my prescription history?

Some do, although practices vary by company and you should ask each insurer. Some also conduct phone interviews or request medical records. Answer accurately, since misrepresentation on an application can give the insurer grounds to cancel the policy.

Is there a waiting period for pre-existing conditions?

An insurer may impose a waiting period of up to six months. It does not apply if you had creditable coverage for the six months before applying with no gap of more than 63 days.

If I am declined by one company, can I apply to another?

Yes. Each insurer sets its own questions and standards, so an outcome with one company does not bind another. Some applications may ask whether you have been declined before.