This article provides general, evergreen education. Medicare rules, plan contracts, costs, and agency guidance can change. Confirm current information through the official sources listed below and the documents that apply to your own coverage.
The timing of a Medigap application can affect the applicant’s federal protections, available options, and whether medical underwriting may be used. The one-time Medigap Open Enrollment Period is different from Medicare’s annual fall Open Enrollment.
Six-month Open Enrollment
Federal law provides a one-time six-month Medigap Open Enrollment Period that begins the first month a person is 65 or older and has Part B.
This window does not repeat every fall. Missing it can reduce options or affect price unless another protection applies.
Verify: Use the Part B effective date and age to identify the potential window, then confirm with the state insurance department or insurer.
Relationship to Part B
The Medigap window is tied to Part B enrollment. A person who delays Part B because of qualifying employer coverage generally begins the Medigap Open Enrollment Period when Part B later starts and the age requirement is met.
Starting Part B while still covered by an employer can start the six-month clock even if a Medigap policy is not immediately needed.
Verify: Coordinate the Part B date with employer coverage and Medigap planning before applying.
Protections during the window
During the federal Medigap Open Enrollment Period, an insurer generally cannot deny an offered policy or use health problems to charge more than it otherwise would for that policy.
The protection applies to policies sold by the insurer in the state; it does not require every insurer to offer every letter.
Verify: Document the application date and retain proof that it was submitted within the protected period.
Medical underwriting
Outside a protected enrollment or guaranteed-issue situation, an insurer may be allowed to ask health questions, review medical information, decline the application, or charge more, subject to federal and state law.
A person should not drop an existing policy until the new policy is approved and the effective date is confirmed.
Verify: Request written approval and compare replacement consequences before canceling coverage.
Guaranteed-issue rights
Federal law creates guaranteed-issue rights in certain situations, such as loss of specified coverage or certain plan changes. The available Medigap choices and deadlines depend on the event.
A guaranteed-issue right is not a general right to buy any policy at any time.
Verify: Follow the official notice and keep proof of the triggering event and prior coverage.
State variations
States can provide protections beyond federal minimums, and Massachusetts, Minnesota, and Wisconsin standardize policies differently. Rules for people under 65 also vary.
A national article cannot determine the complete state-specific right.
Verify: Contact the state insurance department or SHIP and obtain current state guidance.
Common misunderstandings
- “Medigap Open Enrollment occurs every October.” It is generally a one-time six-month period tied to Part B and age.
- “I can safely cancel my current policy while a new application is pending.” Approval should be confirmed first.
- “Guaranteed issue means every plan letter is available.” The right may be limited to specified options.
Questions to consider
- When did or will Part B begin?
- Am I within my federal Medigap Open Enrollment Period?
- Does a guaranteed-issue event apply?
- What additional protections does my state provide?
- Has the new policy been approved in writing before any old coverage is ended?