Medicare
Medicare Special Enrollment Period
A Medicare SEP lets you enroll in Medicare without late penalties when you lose qualifying employer coverage or experience other defined life events.
Last reviewed: May 2026 · Editorial methodology
Definition
A Medicare Special Enrollment Period (SEP) allows individuals to enroll in Medicare Part A, Part B, or Part D — or change Medicare Advantage or Part D plans — outside of the standard enrollment windows when a qualifying event occurs. The most important Medicare SEP is the employer coverage SEP: if you delay Medicare enrollment because you have active coverage through your own or a spouse's current employer, you receive an 8-month SEP to enroll in Part B starting the month employment ends or employer coverage ends, whichever comes first. This SEP does not apply to COBRA or retiree coverage. Other Medicare SEPs are triggered by events such as moving out of a Medicare Advantage plan's service area, losing Medicaid or Extra Help eligibility, gaining or losing dual-eligible status, or being released from incarceration. Medicare Advantage and Part D SEPs triggered by plan-related events — such as a plan losing its CMS contract or significantly reducing its service area — allow mid-year plan changes that would otherwise not be permitted.
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Cover Forge USA Editorial Team
Editorial Lead
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed 2026-06-14
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