Foundations of Care Coordination for Substance Use Disorder delivers an elemental blueprint for formalizing care coordination as the missing infrastructure required to sustain recovery across time, settings, and systems. Widely accepted as the gold standard of quality care, coordination remains largely uncodified, unstandardized, and operationally underdeveloped across the U.S. healthcare system. This book introduces the 7-6-5 Coordination Framework, a practical model for operationalizing care coordination as a distinct, accountable function within modern health systems. Grounded in systems design, research, and applied implementation, it operationalizes the core functions, roles, and infrastructure required to build coordination capacity that is measurable, fundable, and scalable, closing the gaps where relapse and disengagement most often occur. Intended for healthcare leaders, operators, policymakers, and care teams, this definitive framework builds the infrastructure required to make care coordination an essential and repeatable function of modern SUD care.