Variations data and the regulatory rationale.
D003365:Costs and Cost Analysis; D003953:Diagnosis-Related Groups; D006291:Health Policy; D006296:Health Services / Q000706:statistics & numerical data*; D006300:Health Services Misuse; D006801:Humans; D006278:Medicare / Q000331:legislation & jurisprudence; D011445:Prospective Payment System; D012051:Reimbursement Mechanisms; D014481:United States