Which of the following is NOT covered by Medicare Part B?

Medicare Part B primarily covers medically necessary outpatient services, which include a variety of preventive services, diagnostic tests, and certain medical supplies. However, long-term rehabilitation services are generally not included under this coverage. This is due to the fact that Medicare Part B is designed for short-term rehabilitation and does not cover ongoing care aimed at improving functional abilities over a long period.

In contrast, services such as outpatient physician services, durable medical equipment, and clinical lab services are explicitly covered by Medicare Part B, ensuring beneficiaries have access to essential care and resources for their health management. Long-term rehabilitation often falls under different programs, highlighting the specific limitations of Medicare Part B's coverage.