Final answer:
Typically, prescription drugs for home use are billed under Medicare Part D, the prescription drug benefit. While Medicare Part B covers outpatient services, it does not generally cover prescription drugs for home use. The inbuilding pharmacy should bill the medication through a Medicare-approved prescription drug plan under Part D.
Step-by-step explanation:
The subject of this question pertains to which part of Medicare should be billed for the pain medication delivered by an inbuilding pharmacy for home use by an individual receiving outpatient chemotherapy. Usually prescription drugs for home use are covered under Medicare Part D which is Medicares prescription drug benefit. However this can vary depending on whether the medication is considered a self-administered drug received during an outpatient service.
It's important to note that Medicare Part B may cover certain drugs administered during an outpatient visit, such as chemotherapy, but generally does not cover prescription drugs for home use. The billing would typically go through Medicare Part D as this is designed to reduce the cost of prescription drugs for Medicare enrollees. Pharmacies must work with Medicare-approved prescription drug plans to ensure proper billing of medications.