Which healthcare payment method does Medicare use to reimburse

Which discounted fee-for-service healthcare payment method does Medicare use to reimburse physicians? What is the per diem payment method? Which national model for the delivery of healthcare services is financed by general revenue funds from taxes? What is the coding system that is used primarily for reporting diagnoses for hospital inpatients? What coding system was created for reporting procedures and services performed by physicians in outpatient clinical practice?