The Medigap Question That Can End an Application Isn’t About a Diagnosis. It’s “Has a Doctor Recommended a Test You Haven’t Had Yet?”
Most people switching from Medicare Advantage to a Medigap plan worry about their diagnoses, but a single unanswered question about a test their doctor ordered can shut the application down before a condition ever comes up.
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A 67-year-old in Ohio decides to leave her Medicare Advantage plan and move to Original Medicare with a Medigap policy. She considers herself healthy. Her doctor did recommend a follow-up MRI for a shoulder that has been bothering her, but she has not scheduled it.
The Medigap application asks whether a medical professional has advised any test, treatment or surgery that has not been completed, or whether she is waiting for test results. She answers yes. The insurer postpones or declines the application until the MRI is completed and the result is in her chart. No diagnosis ended the application. The unanswered question did.
Why Underwriting Applies
Federal law gives a new Medicare enrollee one six-month Medigap Open Enrollment Period. It begins the first month the person is at least 65 and enrolled in Medicare Part B. During that window, an insurer cannot deny a policy or charge more because of health problems. Outside that period, the rules change. Unless the applicant has a federal guaranteed-issue right or additional state protection, Medigap insurers in most states can review medical history and decide whether to issue the policy.
Federal law sets the floor, but state law can widen the path back to Medigap. New York and Connecticut provide unusually broad access without medical underwriting. Other states offer narrower enrollment protections, including birthday rules that generally help people who already own Medigap change policies. Those rules do not necessarily give a Medicare Advantage member an unrestricted first chance to buy one. For the Ohio applicant, the health questionnaire remains the gate.
An Unfinished Chart Creates Its Own Risk
Many Medigap applications ask about surgery, diagnostic testing or treatment that has been recommended but not completed, as well as test results that remain pending. The exact language and underwriting decision vary by insurer, but a yes can cause the carrier to postpone or decline the application until the medical record has an answer.
The concern is uncertainty. A resolved shoulder problem gives the underwriter something definite to evaluate. An MRI ordered for unexplained pain could reveal anything from routine inflammation to a condition requiring surgery. Potential trouble spots include:
- An MRI, CT scan, biopsy or other diagnostic test ordered for an unresolved symptom.
- Abnormal bloodwork that still requires follow-up.
- A cardiology, oncology or neurological referral that has not been completed.
- Surgery or treatment that has been recommended but not performed.
- A completed test whose results have not reached the chart.
Routine screening should not automatically be treated the same as an unresolved diagnostic workup. An age-based colonoscopy may be viewed differently from one ordered after bleeding or an abnormal result. The application’s wording and the reason for the test both matter. Guessing is not a safe strategy. Insurers may review medical records, prescription histories and attending-physician statements. An answer that conflicts with the record can cause a denial or create problems after the policy is issued.
The Real Risk Is Canceling Too Soon
A declined Medigap application does not automatically force someone out of Medicare Advantage. The dangerous sequence is dropping the Advantage plan first and discovering afterward that the Medigap carrier will not issue a policy. That can leave the applicant on Original Medicare without supplemental protection. Original Medicare has no annual out-of-pocket maximum.
In 2026, the Part A hospital deductible is $1,736 per benefit period. Hospital coinsurance reaches $434 per day for days 61 through 90, while skilled nursing coinsurance is $217 per day for days 21 through 100. Part B generally leaves the beneficiary responsible for 20% of the Medicare-approved amount after the $283 deductible. Underwriting is only one of Medicare’s surprise bills, alongside IRMAA surcharges and coverage gaps we mapped in a free guide here.
The Application Should Come Last
Three steps keep a pending test from turning into a coverage gap:
- Complete medically necessary diagnostic work and wait for the findings and treatment plan to appear in the chart. Do not postpone needed care simply to improve an insurance application.
- Check for a federal trial right, guaranteed-issue event or state protection. Someone who joined Medicare Advantage when first eligible at 65 may have special Medigap rights if returning to Original Medicare within the first year. A separate trial right may apply to someone who dropped Medigap to try Advantage for the first time.
- Apply for Medigap before leaving the Advantage plan. Do not make the coverage change until the new insurer has issued written approval and confirmed the effective date.
Medigap underwriting shuns unfinished details in a medical chart. Finish the workup, get the coverage decision in writing, and only then change the plan already in place.
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Gerelyn Terzo is the author of dividend investing handbook "Dividend Investing Strategies: How to Have Your Cake & Eat It Too." A veteran financial journalist, she covers agri-finance for outlets like Global AgInvesting and the broader stock market and personal finance for 24/7 Wall Street. She began at CNBC and later helped launch Fox Business in New York. Gerelyn currently resides in Woodland Park, Colorado and dabbles in nature photography as a hobby.
