Generally speaking, if you join a Medicare Prescription Drug Plan, you can choose to switch your current plan from October 15 through December 7 of every year -- during the
annual Open Enrollment Period (AEP). Your coverage will begin on January 1st of the new plan year and continue for the calendar year.
In certain cases, such as if you move or enter a nursing home, you can switch your plan at other times using a
Special Enrollment Period (SEP).
Please remember: If you have both Medicare and Medicaid, you can change plans
once per quarter from January through September.