periodic interim payment (PIP)

1. Phrase used in managed care plan contracts that refers to a reimbursement method that prepays providers for services based on their history of utilization by members. It is a much faster form of reimbursement than other arrangements. 2. Under the Medicare program, cost-based reimbursement method for hospitals before 1983 and the introduction of the prospective payment system (PPS).

peritoneal dialysis (PD)

Procedure that introduces dialysate into the abdominal cavity to remove waste products through the peritoneum (a membrane that surrounds the intestines and other organs in the abdominal cavity). It functions in a manner similar to that of the artificial semipermeable membrane in the hemodialysis machine. Three forms of peritoneal dialysis are continuous ambulatory peritoneal dialysis, continuous cycling peritoneal dialysis, and intermittent peritoneal dialysis. This treatment can be done at home, at work, or at another convenient location.