RIZE Massachusetts Foundation hired ICH to conduct an assessment to understand the state of hospital-based addiction care programs and models in Massachusetts. The assessment profiled six sites from across Massachusetts that offered addiction consult services for patients admitted to inpatient units. The sample included community hospitals and academic medical centers of varying sizes in different regions of the Commonwealth. ICH analyzed hospital documents, conducted a literature, and interviewed hospital providers and staff as well as additional expert stakeholders. Through this work, ICH developed a profile of each hospital’s model, identified common themes related to best practices and challenges, and developed recommendations for how to improve, expand, and sustain care hospital-based addiction care models. ICH published a white paper as a resource for other hospitals and funders to inform development of new ACS programs as well as supportive policy and practice changes. This work has been disseminated nationally and RIZE used the findings to develop a grant program supporting community-hospital partnerships.