What is true about a Medicare Supplement open enrollment?

Editorial team InsuredAndMore.com Published on October 21, 2026

A Medicare Supplement (Medigap) Open Enrollment Period is a one-time, 6-month window that begins the first month you are 65 or older and enrolled in Medicare Part B.

Key Facts About Medigap Open Enrollment

Duration: It lasts for 6 months starting the month you turn 65 (or older) and have Part B.
Guaranteed Acceptance: During this 6-month period, insurance companies cannot deny you a Medigap policy, refuse to sell you any policy they offer, or charge you higher rates based on your health or pre-existing conditions.
No Medical Underwriting: You do not have to answer health history questions or pass a medical exam to get approved during this window.
One-Time Window: This is a one-time opportunity; once it closes, you generally lose guaranteed rights, and insurers can subject you to medical underwriting, charge higher prices, or deny coverage later.
Not the Fall Annual Election Period: The fall Annual Election Period (October 15 – December 7) is for Medicare Advantage or Part D plans, not Medigap Open Enrollment.
Free-Look Period: If you buy a policy during this window, you have a 30-day "free-look" period to decide if you want to keep it or switch to a different Medigap policy.

Which of the following statements are true about Medicare Supplement open enrollment and guaranteed issue?

The correct core statement regarding Medicare Supplement (Medigap) underwriting is: Underwriting is required if the consumer is not in their Medicare Supplement Open Enrollment period or does not meet Guaranteed Issue criteria.

Because you did not provide the multiple-choice options, here is the complete breakdown of which standard statements are true and which are false regarding Medicare Supplement Open Enrollment and Guaranteed Issue rights based on UnitedHealthcare / AHIP certification guidelines:

🟢 True Statements

Underwriting Requirement: Required if not in Open Enrollment or without Guaranteed Issue, allowing insurers to deny coverage or change rates.
Open Enrollment Definition: A one-time, 6-month window starting when age 65+ and enrolled in Part B.
Guaranteed Coverage: Insurers must sell any policy without health-based discrimination during Open Enrollment and waive underwriting for qualified Guaranteed Issue scenarios like losing employer coverage.

🔴 False Statements

Underwriting during Guaranteed Issue: False that rate determinations allow underwriting under Guaranteed Issue.
Open Enrollment Questions: False that health/eligibility questions are asked during Open Enrollment.
Timing Confusions: False that Medigap Open Enrollment runs Oct 15–Dec 7 (that is for Medicare Advantage/Part D), or that it is the only time a plan can be bought (applications are allowed anytime, subject to underwriting).

If your test question features variations of these options, please paste them here and I will gladly point out the exact correct answer for you!

Can you be denied Medigap coverage during open enrollment?

No, you cannot be denied a Medigap policy during your official open enrollment period.

Medigap Open Enrollment Rules

No denials: Insurance companies must sell you any Medigap policy they offer during this window.
No extra costs: Companies cannot charge you more because of your health history or medical conditions.
Timing: This one-time, six-month window starts the month you turn 65 and enroll in Medicare Part B.
Pre-existing conditions: Insurers cannot deny coverage for pre-existing health issues, though a short six-month waiting period may apply if you lacked previous continuous coverage.

When Can You Be Denied?

Outside the window: If you apply after your six-month open enrollment period ends, insurers can use medical underwriting to review your health history and deny coverage.
State rules: A few states, such as New York, Connecticut, Massachusetts, and Maine, offer ongoing or annual protections where you cannot be denied at any time.

What is the downside to Medicare Supplement plans?

The main downsides to Medicare Supplement (Medigap) plans are higher monthly premiums, a lack of prescription drug or extra routine benefits, and strict enrollment windows that can lead to coverage denial.

Key Disadvantages

Higher Monthly Premiums: Medigap plans require a separate monthly fee in addition to your standard Medicare Part B premium. These rates often rise as you age.
No Prescription Drug Coverage: Supplements do not cover outpatient medications. You must buy a separate Medicare Part D plan, which adds another monthly bill.
No Extra Routine Benefits: These plans cover medical care only. They exclude routine dental, vision, and hearing care.
Medical Underwriting Risks: You have a guaranteed right to buy any Medigap plan without health questions only during your initial 6-month open enrollment window starting at age 65 and enrolled in Part B. Outside this window, insurers can review your medical history and deny coverage or charge more for pre-existing conditions.

What is the biggest mistake seniors make when enrolling in Medicare?

The biggest mistake seniors make when enrolling in Medicare is missing key enrollment deadlines, which can lead to permanent, lifelong late-enrollment penalties and gaps in medical coverage.

Top Medicare Enrollment Mistakes

Missing the Initial Enrollment Period (IEP): Your window to sign up is a 7-month period that starts 3 months before the month you turn 65, includes your birthday month, and ends 3 months after. Missing this window without qualifying for a special enrollment period leads to delays and penalties.
Failing to Understand Work Rules: Many seniors either sign up for Part B when they don't need to (because they are still working and covered by an employer with 20 or more employees) or fail to realize they must sign up when they retire, missing their 8-month special window.
Ignoring Prescription Drug Coverage (Part D): Failing to sign up for Part D when first eligible—even if you take no medications—can trigger a permanent 1% penalty added to your monthly premium for every month you delayed.
Confusing Advantage and Supplement Plans: Assuming a low-premium Medicare Advantage plan always means lower overall out-of-pocket costs without checking network restrictions, copays, and prior authorization rules. You can read more details on avoiding these errors via the AARP Medicare Guide.

Medicare Supplement Open Enrollment Period

9 related questions found

Which of the following statements is true about a Medicare Supplement insurance plan member?

The true statement is that Medicare Supplement Insurance cannot be used in conjunction with a Medicare Advantage (MA) Plan; therefore, after receiving confirmation of enrollment into an MA Plan, the member must manually cancel their Medicare Supplement policy according to their carrier's rules.

Explanation of the Correct Answer

✅ Mutually Exclusive Coverages: Medicare Supplement (Medigap) plans only work alongside Original Medicare. They cannot be used to pay for out-of-pocket costs if a member switches to a private Medicare Advantage Plan.
✅ No Automatic Cancellation: Enrolling in a Medicare Advantage plan does not automatically trigger the cancellation of a Medicare Supplement policy. The policyholder remains responsible for paying the Medigap premiums until they explicitly contact their insurance carrier to cancel it.

Why Other Common Options Are Incorrect

❌ Incorrect: The Medicare Supplement plan will automatically cancel upon MA enrollment. As noted above, there is no system communication that auto-cancels a Medigap plan. It must be handled manually by the policyholder.
❌ Incorrect: The plans work together to cover remaining copays. Medigap policies cannot pay out for secondary costs under an MA plan network. It is actually illegal for an insurance agent to sell someone a Medigap policy if they know that person is enrolled in an MA plan.
❌ Incorrect: The member must cancel their Supplement policy on the exact same day they apply for an MA plan. The member should wait until they receive official confirmation of enrollment from the MA plan before canceling their Supplement coverage to avoid an accidental gap in insurance.

What is a true statement about Medicare Supplement plans?

A true statement about Medicare supplement (Medigap) plans is that they are standardized by the federal government and sold by private insurance companies to fill cost-sharing gaps in Original Medicare.

📌 Core Facts About Medigap Plans

Standardized benefits: Plans with the same letter offer identical coverage.
Provider freedom: You can see any doctor accepting Medicare.
No duplication: They cannot duplicate Original Medicare benefits.
Guaranteed renewable: Policies cannot be canceled if premiums are paid.
Separate drug coverage: They do not include prescription drugs (Part D).

What is the most popular supplemental insurance for Medicare?

Medicare Supplement (Medigap) Plan G is the most popular supplemental insurance plan for Medicare.

Top Insurance Providers

AARP by UnitedHealthcare: Widely recognized with nationwide availability and extra perks like SilverSneakers.
Mutual of Omaha: Known for competitive long-term pricing and strong financial stability.
State Farm: Highly rated for customer satisfaction and low complaint records.

What makes a person ineligible for Medicare Supplement insurance?

A person is legally ineligible for a Medicare Supplement Insurance (Medigap) policy if they are enrolled in Medicaid or do not have both Original Medicare Part A and Part B Kannonball Insurance Solutions.

While not strictly "ineligible" by law, applicants can also be flatly denied coverage by private insurance companies due to timing and health factors Can You Be Denied Supplemental Insurance for Medicare?.

Strict Legal Ineligibility

Enrolled in Medicaid: Federal law makes it illegal for an insurance company to sell a Medigap policy to someone who has Medicaid, because Medigap would be duplicate coverage Which of the following would make a person ineligible for Medicare....
Missing Medicare Parts: You must be enrolled in both Medicare Part A (Hospital Insurance) and Medicare Part B (Medical Insurance) to qualify What Would Keep You From Having a Medicare Supplement? - Kannonball Insurance Solutions.
Enrolled in Medicare Advantage: You cannot have a Medigap plan at the same time you have a Medicare Advantage Plan (Part C); you must disenroll from Advantage and return to Original Medicare first.

Reasons for Application Denial (Underwriting Rejections)

If you apply for Medigap outside your initial six-month Open Enrollment Period or lack a Guaranteed Issue Right, insurance companies can use medical underwriting to deny you Can I Be Denied a Medigap Plan?. You may be rejected based on:

Pre-existing health conditions: Serious diagnoses—such as active cancer, congestive heart failure, kidney disease, or Alzheimer's—frequently lead to a denial Can I Be Denied a Medigap Plan?.
Applying late: Missing your one-time 6-month window that begins when you turn 65 and enroll in Part B Can You Be Denied a Medigap Plan?.

Do retirees really need supplemental insurance with Medicare?

For most retirees, yes, supplemental insurance or an alternative like Medicare Advantage is strongly recommended because Original Medicare leaves an open-ended 20% coinsurance with no annual out-of-pocket maximum.

Why Original Medicare Has Gaps

No Out-of-Pocket Cap: Original Medicare Parts A and B cover about 80% of approved medical costs, leaving you responsible for the remaining 20% with no ceiling to protect against high bills.
Missing Services: Standard Medicare does not pay for routine dental, vision, hearing aids, or long-term care.
Deductibles: You must pay separate deductibles for hospital stays (Part A) and outpatient services (Part B).

Who Needs Supplemental Coverage (Medigap)

Chronic Health Needs: If you visit specialists frequently or need ongoing treatments, a 20% coinsurance adds up quickly.
Provider Freedom: Medigap lets you see any doctor nationwide who accepts Medicare, without network limits or referrals.
Travel: Most Medigap policies cover emergency medical care when traveling outside the United States.

Who Might Not Need a Medigap Plan

Robust Retiree Benefits: Former employers or unions sometimes provide comprehensive wraparound health plans that already fill Medicare’s gaps.
Medicaid Eligibility: Individuals who qualify for both Medicare and Medicaid (dual-eligible) have state assistance covering out-of-pocket costs.
Medicare Advantage (Part C): These private plans replace Original Medicare, bundle prescription drugs, and set an annual out-of-pocket maximum, though they use restricted doctor networks.