1. The Medicare preferred provider organization demonstration: overview of design, characteristics, and outstanding issues of interest Author(s): Gold, Marsha R. Publication: Washington, DC : Public Policy Institute, AARP, c2003 Subject(s): Medicare Part C -- organization & administrationInsurance Benefits -- statistics & numerical dataPreferred Provider Organizations -- statistics & numerical dataRisk Sharing, Financial -- organization & administrationUnited StatesMedicare+Choice Program (U.S.)