Medicare maintains enrollment schedules throughout the year. Medicare Part D prescription drug coverage is optional—you are not automatically enrolled and you are not required to have it. But if you want and need Medicare Part D prescription drug coverage, you need to enroll during a formal enrollment period to avoid paying a Late Enrollment Penalty, or LEP. The LEP is a dollar amount added to your Part D premium.
Medicare Coverage & Costs | Wed, Dec 14, 2011 @ 09:00 AM Posted by Medicare Made Clear