1. Prescription opioids: Medicare needs to expand oversight efforts to reduce the risk of harm : report to Congressional requesters Publication: Washington, DC : United States Government Accountability Office, October 2017 Subject(s): Analgesics, Opioid -- therapeutic useDrug Utilization ReviewGovernment RegulationInappropriate PrescribingMedicare Part DPrescription Drug MisuseFraud -- prevention & controlOpioid-Related DisordersHumansUnited StatesCenters for Medicare & Medicaid Services (U.S.)