Special Enrollment Periods (SEPs) are periods of time outside normal enrollment periods when you can enroll in Medicare or change your health and/or drug coverage. One example is the Part B SEP, which allows you to enroll in Part B without penalty while you have job-based insurance and for eight months after you lose the insurance or stop working. SEPs triggered by specific circumstances may also allow you to switch or disenroll from Part D and Medicare Advantage Plans. For example, if you moved out of your plan’s service area, you would receive an SEP to switch to another plan.