title: Medicare outpatient payment system undergoes change.
authors.forename: Donna
authors.initials: D
authors.lastname: Young
mesh_terms: D000553:Ambulatory Care / Q000191:economics* / Q000639:trends; D016527:Drug Costs / Q000639:trends; D006308:Health Systems Plans / Q000191:economics / Q000639:trends; D006801:Humans; D006278:Medicare / Q000191:economics* / Q000639:trends; D014481:United States