Medigap Underwriting: Can You Be Denied for a Pre-Existing Condition?
Yes, you can be denied a Medigap policy because of a pre‑existing condition—but only if you apply outside your Medigap Open Enrollment Period (MOEP) and do not qualify for a guaranteed issue right. During the six‑month MOEP that starts when you’re both age 65 and enrolled in Part B, insurers must sell you any plan they offer at standard rates, no health questions asked. Once that window closes, medical underwriting can block you outright or impose a pre‑existing condition waiting period of up to six months.
Key boundary: These protections apply to most people turning 65. If you are under 65 and on Medicare due to a disability or end‑stage renal disease (ESRD), federal guaranteed‑issue protections are weaker. In many states insurers can deny you even during your first six months of Part B. Check your state’s rules—a few states (e.g., California, New York) extend stronger protections to under‑65 enrollees.
When Insurers Cannot Deny You
The most powerful protection is the Medigap Open Enrollment Period (MOEP) . It begins the month you are both age 65 or older and enrolled in Medicare Part B, and lasts exactly six months. During this window:
- You can buy any Medigap plan sold in your state (Plans A, B, C, D, F, G, K, L, M, N—though Plans C and F are closed to new enrollees turning 65 after January 1, 2020).
- Insurers cannot deny you or charge a higher premium due to your health or any pre‑existing condition.
- No medical underwriting is required.
Counter‑intuitive fact: Many people assume that because they have Original Medicare, they are automatically eligible for any Medigap plan. In reality, outside the MOEP, insurers treat Medigap as a separate risk product and can reject you for conditions that Medicare itself covers—like heart disease, diabetes, or a recent hospitalization.
Guaranteed Issue Rights: When You Still Get In Without Underwriting
Even after your MOEP ends, federal law grants guaranteed issue rights in certain situations. Insurers must sell you a Medigap policy without medical underwriting. Common triggers:
| Situation | Time limit to apply | Pre‑existing condition waiting period |
|---|---|---|
| You lose employer group health coverage (including COBRA) | 63 days after coverage ends | Up to 6 months if you lack creditable coverage for the prior 63 days |
| Your Medicare Advantage plan leaves your service area or stops offering coverage | 63 days from termination date | Same 6‑month waiting period applies |
| You drop a Medicare Advantage plan within the first 12 months of joining (trial right) | 63 days after disenrollment | Waiting period applies |
| You drop your first Medigap policy within the first 12 months | 63 days after disenrollment | Waiting period applies |
Important nuance: Even with a guaranteed issue right, the new Medigap insurer can impose a 6‑month pre‑existing condition waiting period if you had a gap in health coverage longer than 63 days. Most people coming from employer plans or Medicare Advantage have continuous creditable coverage, so this waiting period rarely applies. But if you let COBRA lapse or took a month off from coverage, that gap can trigger the waiting period for conditions treated in the first six months.
When Underwriting Can Block You
Outside the MOEP and any guaranteed issue event, insurers are legally allowed to use medical underwriting. They review:
- Medical history (recent hospitalizations, surgeries, diagnoses)
- Current prescription drug use
- Chronic conditions (e.g., diabetes, heart disease, COPD)
- Pending tests or treatments
Based on this review, an insurer can:
- Deny your application outright for any health reason.
- Offer a policy at a higher premium (only in the few states that allow health‑based rating; most states use community, issue‑age, or attained‑age rating, but denial remains permitted).
- Refuse to sell certain plan types (e.g., some insurers may reject Plan G but offer Plan A).
Practical implication of a denial: If an insurer denies you, you still have options. Your best practical move is to enroll in a Medicare Advantage plan (Part C) during the Annual Enrollment Period (Oct 15–Dec 7) or a Special Enrollment Period—Medicare Advantage does not use medical underwriting. Alternatively, some states offer high‑risk pools or have their own guaranteed issue laws that may cover your situation. Do not assume you are uninsurable for good; switch strategies.
Operator Flow: Applying for Medigap with a Pre‑existing Condition
Follow this process if you are outside your MOEP and need a Medigap policy.
Step 1: Check for a guaranteed issue right
Review the list of qualifying events (loss of employer coverage, Medicare Advantage plan leaving your area, trial rights). If none apply, you will face full medical underwriting.
Early checkpoint: Verify that the 63‑day window from any qualifying event hasn’t expired. If it has, skip to Step 5.
Step 2: Gather your medical records and prescription list
Insurers typically request the last 2–5 years of medical history. Have this ready to speed up applications.
Step 3: Contact multiple insurers
Each company uses its own underwriting guidelines. You may be denied by one but accepted by another. Plan premiums can also vary.
Likely cause of denial: Recent hospitalization (within 12 months), a new diagnosis of heart disease or cancer, or ongoing treatment for a chronic condition. If any of these apply, expect a denial and prepare to shift to Medicare Advantage.
Step 4: Submit applications and wait
Underwriting decisions usually take 1–4 weeks. If you have a serious condition, expect a denial or a plan with a higher premium (only in states that permit health‑based rating).
Step 5: If denied, explore alternatives
Medicare Advantage plans (Part C) do not use medical underwriting—you can enroll during Medicare’s Annual Enrollment Period (Oct 15–Dec 7) or a Special Enrollment Period. Some states (e.g., California, New York, Massachusetts, Washington) have their own guaranteed issue laws that may offer broader access.
Escalation signal: If you are denied by every insurer you approach, contact your State Insurance Department. Some states have intervention programs or high‑risk pools.
Success check: You receive a policy confirmation with no exclusion rider and no waiting period.
Friction point: Even if accepted, some insurers may refuse to sell you the plan you want (e.g., Plan G) but offer a less comprehensive plan (e.g., Plan A). Decide whether a partial Medigap policy is worth the premium compared to switching to Medicare Advantage.
Three Practical Tips to Avoid Denial or Waiting Periods
Tip 1: Buy your Medigap policy during your MOEP
Actionable step: Mark the exact date your Part B starts. Your six‑month MOEP begins on the first day of the month you are both 65 and enrolled in Part B. Buy any plan during this window regardless of your health.
Common mistake: Delaying because you feel healthy or want to “save premiums.” If you wait 7 months, you lose the guarantee and may be denied later if your health changes.
Tip 2: Apply immediately when you lose employer coverage
Actionable step: Within 63 days of losing your group health plan, submit a Medigap application using your guaranteed issue right. Use the termination letter from your employer or COBRA administrator as proof.
Common mistake: Assuming COBRA continuation counts as active coverage for the entire 63‑day window. It does—your 63‑day clock starts when COBRA ends, not when you first lost the group plan. Still, apply before COBRA runs out so you have no gap.
Tip 3: Keep continuous creditable coverage
Actionable step: If you switch between Medicare Advantage and Medigap, avoid gaps longer than 63 days. A gap resets the creditable coverage clock, allowing the new Medigap insurer to impose a 6‑month pre‑existing condition waiting period even under a guaranteed issue right.
Common mistake: Taking a “break” from Part C or Part A/B because you’re traveling abroad or “don’t need it.” That gap can trigger a waiting period that delays coverage for expensive conditions like a heart attack or cancer treatment.
Important Caveats
- State rules differ. California, New York, Connecticut, Massachusetts, Maine, Vermont, and Washington have stronger guaranteed issue laws than federal rules. Check your state insurance department website.
- Pre‑existing condition waiting periods can still apply under guaranteed issue rights if you lacked creditable coverage for the prior 63 days. The waiting period is 6 months and covers only expenses related to that condition.
- No application fee for denial. You’re not charged if an insurer denies you. The cost is your time and the risk of being uninsurable later.
- Medicare Advantage is always an alternative if Medigap is denied. You can enroll without underwriting during the Annual Enrollment Period (Oct 15–Dec 7) or a Special Enrollment Period (e.g., if you move out of your plan’s service area). Just remember that MA plans have network restrictions and out‑of‑pocket maximums.
Disclaimer: This information is for educational purposes and does not constitute legal or insurance advice. Medicare rules, premiums, and plan availability change annually (2025 Part B premium is $185.00/month; Part B deductible is $257.00 in 2025). For current Medigap underwriting policies and your specific situation, contact a licensed insurance agent in your state or visit Medicare.gov.
Mike Spencer is the lead researcher at ssfaq.com, specializing in Social Security benefits, Medicare enrollment, and retirement planning. With years of experience analyzing SSA and CMS policy, he translates complex government regulations into clear, actionable guidance for retirees, near-retirees, and disabled workers. Every article is researched using official SSA.gov, Medicare.gov, and IRS.gov sources.