Glossary
Special Enrollment Period (SEP)
A Special Enrollment Period (SEP) is a window outside the normal enrollment dates when you can sign up for or change Medicare coverage because of a qualifying life event — losing employer coverage, moving, qualifying for Extra Help, or your plan leaving your area. Each trigger has its own timing rules.
SEPs exist so that life changes do not lock you out of coverage or force a penalty. Common triggers include the end of job-based insurance, a move to a new plan’s service area, gaining or losing Medicaid or Extra Help, and a plan ending its contract.
The length of the window depends on the event — for example, the SEP after employer coverage ends runs eight months for Part B. Because the rules vary, it helps to confirm your specific window before you act.
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