Physician or hospital is paid one sum for all services delivered during one illness; there is a different set case-price for each of approximately 750 distinct DRGs (Medicare).
Per Diem
The hospital is paid for all services delivered to a patient during one day (private insurance, PPOs/HMOs).
Fee-For-Service
The physician or hospital is paid a fee for each service (e.g., medication, IV fluids, ECG, surgical procedure) provided (uninsured, some private insurance).
Capitation
One payment is made for each patient’s treatment during a month or year (has now virtually disappeared; previously, largely HMOs).