For people with Medicare, the Medicare Part D outpatient prescription drug benefit is provided by private plans, either Medicare Advantage plans that offer Part D drug coverage (MA-PDs) or, for those in traditional Medicare, stand-alone prescription drug plans (PDPs). While most beneficiaries are enrolled in Medicare private plans on an individual basis, some have coverage through a group plan sponsored by an employer or union providing retiree health benefits, either group MA plans that cover Medicare Part A and B benefits, which can also include Part D coverage, or group PDPs that cover prescription drugs only. ARTICLE
