DRGs as one of nine approaches to case mix in transition.
D002965:Classification / Q000379:methods; D003365:Costs and Cost Analysis; D003953:Diagnosis-Related Groups; D004194:Disease / Q000145:classification*; D006801:Humans; D010361:Patients / Q000145:classification; D011445:Prospective Payment System; D012051:Reimbursement Mechanisms; D014481:United States