What reimbursement method is the health plan using when paying Dr. Tan $15 per patient per month?

The reimbursement method being utilized when the health plan pays Dr. Tan $15 per patient per month is known as a prospective payment system. This type of payment structure is characterized by a fixed monthly payment for each enrolled patient, regardless of the number of services provided. This fixed amount, often referred to as a capitation payment, incentivizes healthcare providers like Dr. Tan to focus on preventive care and managing the overall health of their patients rather than billing for each individual service.

In contrast, other reimbursement methods involve different approaches: fee-for-service entails billing for each service rendered, traditional retrospective payment systems pay providers based on services provided after care has been delivered, and value-based payment focuses on quality and outcomes rather than strictly the volume of services. In this scenario, Dr. Tan's payment structure aligns with the principles of prospective payment, making it the correct answer.