Objectives: To inform geriatric mental health policy by describing the role of behavioral healthcare providers within a geriatric patient-aligned care team (GeriPACT), a patient-centered medical home model of care within the Veterans Health Administration (VHA), serving older veterans with chronic disease, functional dependency, cognitive decline, and psychosocial challenges, and/or those who have elder abuse, risk of long-term care placement, or impending disability. Methods: The authors used mixed methods, consisting of a national survey and site visits between July 2016 and February 2017, at VHA outpatient clinics. The participants, 101 GeriPACTs at 44 sites, completed surveys, and 24 medical providers were interviewed. A standardized survey and semi-structured interview guide were developed based on the program handbook, with input from experts in the VHA Office of Geriatrics and Extended Care Services, guided by the Consolidated Framework for Implementation Science Research. Results: Of surveyed GeriPACTs, 42.6% had a mental health provider on the team-a psychiatrist (28.7%) and/or psychologist (23.8%). Of these, the mean was 0.27 full-time