Which of the following expenses is not covered under Part B of Medicare?

Part B of Medicare primarily covers outpatient care, which includes medical services such as doctor visits, diagnostic tests, and preventive services. These components are essential for managing health and preventing diseases. Doctor visits are crucial for receiving professional healthcare advice and treatment, while diagnostic tests help in identifying medical conditions. Preventive services, such as screenings and vaccinations, aim to catch potential health issues early and maintain overall health.

Elective cosmetic surgery, on the other hand, is not considered a necessary medical service and is not covered by Part B of Medicare. Such procedures are typically performed to improve appearance rather than to treat a medical condition. This distinction is key, as Medicare focuses on essential healthcare needs rather than elective enhancements. Thus, when considering what expenses are covered under Part B, it is clear that elective cosmetic surgery falls outside its scope.