title: What's a PSO? HCFA previews its definition.
authors.forename: E
authors.initials: E
authors.lastname: Weissenstein
mesh_terms: D014487:Centers for Medicare and Medicaid Services, U.S.; D019058:Community Networks / Q000145:classification* / Q000191:economics; D003284:Contract Services; D016345:Medicare Part B; D014481:United States