The Medicare Supplement Open Enrollment Period is a one-time window when people who are 65 or older and enrolled in Medicare Part B have important protections when applying for a Medigap policy. It lasts for six months and begins the first month both requirements are met.

Because this enrollment period is different from Medicare’s annual Open Enrollment Period, it is easy to confuse the two. Below, this Medicare supplemental insurance agency in Michigan City, Indiana is going to explain when the Medigap Open Enrollment Period begins, what protections it provides, and what happens after it ends.

When Does the Medicare Supplement Open Enrollment Period Begin?

Your federal Medigap Open Enrollment Period begins on the first day of the month in which you are both 65 or older and enrolled in Medicare Part B.

The period lasts for six months. For Medicare beneficiaries in Michigan City, Indiana, knowing when Part B coverage begins can help determine when this one-time enrollment window starts and ends.

Is Medigap Open Enrollment the Same as Medicare Open Enrollment?

No.

The annual Medicare Open Enrollment Period runs from October 15 through December 7 and is primarily used to make changes involving Medicare Advantage and prescription drug coverage.

The Medigap Open Enrollment Period is different. It is tied to your age and Part B enrollment rather than a recurring calendar period, and it does not automatically return each year.

Why Is the Medigap Open Enrollment Period Important?

During this six-month period, federal law provides protections when you apply for Medicare Supplement coverage.

Insurance companies generally cannot use medical underwriting to deny your application because of current or past health problems during this window. You can apply for Medigap policies available to people in your situation, subject to the rules governing which standardized plans you may purchase.

A knowledgeable Medicare supplemental insurance agency in Michigan City, Indiana can help you understand the plans you are eligible to consider during this period.

What Happens If I Delay Medicare Part B?

If you delay Part B because you have qualifying coverage through current employment, your Medigap Open Enrollment Period generally does not begin until you later enroll in Part B and are at least 65.

That is why the timing of Part B enrollment matters. Medicare enrollment rules can vary based on individual circumstances, so understand how existing coverage affects your timeline before making changes.

Can I Buy Medigap After My Open Enrollment Period?

You may still be able to apply for a Medicare Supplement policy after the initial Open Enrollment Period ends.

However, unless you have another guaranteed-issue right or protection under applicable law, an insurance company may be allowed to use medical underwriting when reviewing the application.

An experienced Medicare supplemental insurance agency in Michigan City, Indiana can help you review whether another enrollment protection may apply.

Are There Other Times When I May Have Medigap Rights?

Yes.

Federal law provides guaranteed-issue rights in certain situations, including some circumstances involving the loss or change of other health coverage. The exact rights and deadlines depend on the situation.

Indiana also has state-specific Medigap protections, so beneficiaries should review both federal and Indiana rules rather than assuming the initial six-month period is their only opportunity.

What Is Indiana’s Medigap Birthday Rule?

Beginning in 2026, Indiana provides an additional opportunity for certain existing Medigap policyholders age 65 or older to change insurance companies around their birthday while keeping the same lettered Medigap plan.

This birthday rule is separate from the initial federal Medigap Open Enrollment Period. It does not restart the original six-month window, and eligibility requirements apply.

What Should I Do Before My Medigap Open Enrollment Period Starts?

Learn when your Part B coverage becomes effective and review Medicare Supplement options before the six-month window begins.

It can also help to consider healthcare needs, preferred providers, travel habits, prescription coverage, and how supplemental coverage would fit with Original Medicare.

At Senior Care Insurance Services, we help Medicare beneficiaries understand enrollment timelines and compare supplemental coverage based on their individual circumstances.

Looking for a Medicare Supplemental Insurance Agency in Michigan City, Indiana?

The Medicare Supplement Open Enrollment Period is generally a one-time, six-month window that begins when you are 65 or older and enrolled in Medicare Part B. A professional Medicare supplemental insurance agency in Michigan City, Indiana can help you understand the timing, protections, and plan choices that may apply to you.

At Senior Care Insurance Services, we help clients navigate Medicare Supplement enrollment without making an already complicated process harder to understand. Contact us to review your timeline and discuss the coverage options available to you.