Definitions for "Special Enrollment Period"
A period of time, triggered by specific circumstances, during which you can enroll in Medicare Part B or Part D without having to pay a premium penalty. Under Part B, your SEP begins the month after employment or group health coverage ends (whichever comes first). Under Part D, you are eligible for an SEP if you lose—through no fault of your own—any type of drug coverage that was considered “creditable.
A 30-day period during which time an employee's dependent may enroll in the plan, after his or her initial eligibility period and not be considered a late enrollee. This time usually follows a qualified family status change.
Special Enrollment Periods permit a Part D beneficiary to change plans without penalty in a number of circumstances, including, among others, if the beneficiary involuntarily loses certain other drug coverage, the individual is a full-benefit dual eligible individual, the individual moves outside of the region where the PDP is offered, or the beneficiary enters or leaves a long-term care facility.