Which of the following statements about Medicare Prescription Drug Plans is true?

The statement that a consumer must reside in the plan's service area to enroll in a Medicare Prescription Drug Plan is accurate. Each Medicare Prescription Drug Plan (PDP) has a specific geographic area where it offers coverage, and individuals seeking to enroll must be living within that defined service area. This requirement ensures that the plan can adequately provide the necessary services and maintain a network of pharmacies available to members.

The other statements do not hold true under Medicare regulations. Not all drugs are covered under every Medicare Prescription Drug Plan; each plan has its own formulary, which is a list of covered medications. Furthermore, Medicare Part D is not part of Medicare Supplement Insurance Plans (Medigap); it is a separate program designed specifically for prescription drug coverage. Lastly, benefits can vary significantly between different plans, as different insurers offer unique coverage options which can impact premiums, deductibles, and the specific medications that are covered.