: Hospitals are increasingly filled with people admitted for medical and surgical complications of substance use disorder (SUD). Hospitalization can be a reachable moment to engage and initiate SUD care. Yet most hospitals do not have systems in place to adequately address addiction, and most providers have little to no addiction training. There is widespread need for protocols and tools to implement hospital-based SUD care. We share best practices from our hospital-based Improving Addiction Care Team (IMPACT). We include a description of interprofessional roles (medical providers, social workers, peers with lived experience in recovery) and include detailed appendices of practical tools such as medication protocols (eg, buprenorphine induction), risk assessments (eg, outpatient parenteral antibiotic therapy) and treatment tools (eg, a patient safety care plan to manage patient and staff expectations surrounding risks for in hospital drug use). A case example illustrates how IMPACT works and how tools can be applied. We hope other hospitals can adapt and integrate these tools to support widespread implementation of hospital-based SUD care.