1. Medicaid expansion: behavioral health treatment use in selected states in 2014 : report to Congressional requesters Publication: Washington, D.C. : U.S. Government Accountability Office, June 2017 Subject(s): MedicaidMental Disorders -- drug therapyMental Disorders -- therapyMental Health Services -- utilizationAnalgesics, Opioid -- therapeutic useForecastingMental Health Services -- trendsOpioid-Related DisordersHumansIowaNew YorkWashingtonWest VirginiaUnited StatesUnited States.