1. Opioid use in Medicare Part D remains concerning Publication: [Washington, D.C.] : U.S. Department of Health and Human Services, Office of Inspector General, June 2018 Subject(s): Analgesics, Opioid -- therapeutic useMedicare Part DOpioid-Related Disorders -- epidemiologyPrescription Drug MisuseAnalgesics, Opioid -- economicsFentanyl -- adverse effectsPrescription Drug DiversionHumansUnited StatesUnited States. Department of Health and Human Services.