MRHI Introduction to Revenue Cycle. Analyze the differences and similarities between prospective payment models. Evaluate how code sets are used to create the reimbursement methodology of each model. rospective Payment System (PPS) is a method of reimbursement in which Medicare payment is made based on a predetermined, fixed amount. The payment amount for a particular service is derived based on the classification system of that service (for example, diagnosis-related groups for inpatient hospital services).