The SUPPORT for Patients and Communities Act (P.L. 115-271), required MACPAC to conduct a study on institutions for mental diseases (IMDs) receiving Medicaid payment under fee for service or managed care, based on information collected from a representative sample of states. This presentation provides an overview of the study, slated for publication in January 2020. The study will examine state requirements, such as certification, licensure and accreditation, applied to IMDs; other quality, facility, and clinical standards that IMDs must meet to receive Medicaid payment, and how the state determines if standards have been met; which IMDs are receiving payment in each state; and which authorities are used to pay for services in IMDs.