There are only certain times when you can enroll/dis enroll or change a Medicare Advantage plan. Note that Medicare Advantage plans are sometimes called Medicare Part C or an MAPD plan. There is a general period when someone turns 65 in which they can enroll. This time frame is 3 months before the month they turn 65, the month they turn 65 and three months after they turn 65. There is also the AEP period during which current members can make any type of plan change. This period runs from October 15th to December 7th every year. During this time, an application can be put in to make a change for a January 1 effective date. The last type of period is the SEP period (Special Election Period) in which a change can be made at any time during the year. Click on the link below for access to a grid showing all elections.