Final answer:
Under the Part D benefit, drugs filled at an out-of-network pharmacy are covered only when the member is unable to use an in-network pharmacy for covered medications, generally at a higher cost.
Step-by-step explanation:
Under the Part D benefit of Medicare, drugs filled at an out-of-network (OON) pharmacy are only covered when the member is unable to use an in-network pharmacy for their covered medications. However, in these cases, the coverage is generally at a higher cost.
Medicare Part D is a prescription drug benefit program that helps individuals pay for their prescription medications. It requires participants to pay an annual premium and deductible, while the federal government covers 75% of their prescription drug costs up to a certain limit.