Integrating primary care and behavioral health is an important focus of health system transformation. Cross-case comparative analysis of 19 practices in the United States describing integrated care clinical workflows. Surveys, observation visits, and key informant interviews analyzed using immersion-crystallization. Staff performed tasks and behaviors-guided by protocols or scripts-to support 4 workflow phases: (1) identifying; (2) engaging/transitioning; (3) providing treatment; and (4) monitoring/adjusting care. Shared electronic health records and accessible staffing/scheduling facilitated workflows. Stakeholders should consider these workflow phases, address structural features, and utilize a developmental approach as they operationalize integrated care delivery.