1. Opioid use in Medicare Part D in Missouri Publication: [Washington, D.C.] : U.S. Department of Health and Human Services, Office of Inspector General, September 2019 Subject(s): Analgesics, Opioid -- therapeutic useMedicare Part DOpioid-Related Disorders -- epidemiologyPrescription Drug MisuseDrug UtilizationPrescription Drug DiversionState GovernmentHumansMissouriUnited States