PROJECT SUMMARY Alcohol Use Disorder (AUD) is one of the leading causes of preventable death in the US and has high personal and societal costs. Despite the widespread acceptance that evidence-based treatments exist for AUD, less than one in nine individuals with AUD report receiving specialty treatment. Challenges are particularly acute in disadvantaged communities. Only 60 percent of US counties have a specialty substance use disorder (SUD) treatment clinic that accepts Medicaid, despite Medicaid being the largest payer of addiction treatment services in the US. In 2017, The Centers for Medicare and Medicaid Services initiated the Certified Community Behavioral Health Clinic (CCBHC) demonstration, a program designed to increase access and the receipt of evidence-based care in Medicaid in eight states. As a part of this initiative, CCBHCs were required to provide nine services chosen to improve access; to provide data on quality metrics; and to engage in a prospective payment system. Since the initial 66-clinic demonstration, the CCBHC program has expanded to over 240 clinics in 40 states; A primary distinction between the initial demonstration and the expanded model is that in the expanded model clinics retain traditional reimbursement mechanisms but are awarded a large annual grant (~$2 million). We use a quasi-experimental approach to compare changes in the receipt of AUD services before and after CCBHC program implementation with changes in the receipt of AUD services in a set of matched comparison clinics (or counties). Our project brings together an interdisciplinary team of health services researchers, physicians, and economists with the methodological and substantive expertise to examine this understudied issue and explore its complex public health, clinical, and policy implications. Our specific aims are to assess whether CCBHC implementation was associated with: 1a) Changes in AUD identification and treatment quality; 1b) Differential changes in AUD identification and treatment quality in demonstration versus expansion clinics; 2) Differential changes in AUD treatment receipt and quality during the COVID-19 public health emergency in CCBHC compared to non-CCBHC clinics; and 3) Changes in trajectories of public health outcomes, including county-level reports of crime and alcohol-involved fatal motor vehicle accidents. This grant is responsive to NOT-AA-20-022, “Notice of Special Interest: Advances in Research for the Treatment, Services, and Recovery of Alcohol Use Disorder” and will provide information ‘to bridge the gap between those who need treatment and those who receive treatment.’ In addition, we focus on the Medicaid program, which disproportionately serves NIH-designated US health disparity populations. The significance of this study lies in its focus on how to optimize delivery systems to improve treatment and outcomes associated with AUD, a growing challenge and understudied policy issue.