What is the Annual Election Period (AEP)?
The Annual Election Period begins October 15, and ends December 7. Anyone who already enrolled in a Medicare Part D plan may change plans during this period each year without penalty. Eligible individuals (people on Medicare) who chose not to enroll during their initial Open-Enrollment Period may enroll in Medicare Part D between October 15 and December 7 each year, but penalties will apply unless the individual had "creditable" prescription drug coverage*. Enrollments during this period have an effective date of January 01.
Information from Medicare.gov, Prescription Drug Coverage (2016), Prescription Drug Coverage: Basic Information (2016)
The Annual Election Period begins October 15, and ends December 7. Anyone who already enrolled in a Medicare Part D plan may change plans during this period each year without penalty. Eligible individuals (people on Medicare) who chose not to enroll during their initial Open-Enrollment Period may enroll in Medicare Part D between October 15 and December 7 each year, but penalties will apply unless the individual had "creditable" prescription drug coverage*. Enrollments during this period have an effective date of January 01.
Information from Medicare.gov, Prescription Drug Coverage (2016), Prescription Drug Coverage: Basic Information (2016)