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Medicare Supplement Insurance open enrollment period

Christian Worstell by Christian Worstell    |    Published Oct 03, 2019    |    Reviewed by John Krahnert

Medicare Supplement Insurance (Medigap) has a six-month open enrollment period (OEP). Your open enrollment period begins when you are both:

  • 65 years old and
  • Enrolled in Medicare Part B

Unlike the Medicare OEP that happens once every year, you have only one Medigap OEP. If you get Medicare Part B before you turn 65, your Medigap OEP starts the first day of the month you turn 65. If you delay enrolling in Medicare Part B until after you turn 65, your Medigap OEP automatically starts the month you enroll in Medicare Part B.

Benefits of buying Medigap during open enrollment

Purchasing a Medicare Supplement Insurance policy during the Medigap OEP provides several consumer protections. During the OEP, you have the following protections:

  1. Medigap insurance companies cannot deny you coverage.
  2. Insurers cannot increase premium costs because of your health when you purchase your policy.
  3. You are allowed to switch your Medigap insurance policy within your 6-month OEP.
  4. You do not have to wait for coverage to begin (although there may be a waiting period for coverage of a pre-existing condition).

You can apply for a Medigap policy outside of your OEP, but there are fewer consumer protections than if you buy a policy during your OEP. After your OEP has passed, Medigap insurance companies are usually allowed to use medical underwriting, which helps the insurer determine whether or not to accept your application and the policy’s premium.

Medical underwriting is not allowed during your open enrollment period. Medicare.gov states that “if you apply during your Medigap open enrollment period, you can buy any Medigap policy the company sells, even if you have health problems, for the same price as people with good health.”

Under-65 open enrollment period

If you are under 65 and qualify for Medigap insurance coverage, you do not have as many consumer protections as over-65 applicants. Federal law does not require Medigap insurance companies to sell policies to Medicare beneficiaries under the age of 65. If you are under 65 years of age, you might not be able to buy your preferred Medigap policy, or any other Medigap policy, until you turn 65.

Some state insurance departments extend protections for those under 65, but buying a Medigap policy.

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