Medicare Glossary

Definitions for common Medicare terms

Medigap open enrollment period

DEFINITION: You are eligible to enroll in a Medigap policy – without the possibility of being denied coverage – during a six-month window that begins the first month that you’re at least 65 years old and are also enrolled in Medicare Part B. If you apply for coverage after that six-month window has ended, insurers in most states have the right to reject your application or charge you more based on your medical history.

Read more about Medigap coverage.