Objective: This study investigated a quality indicator for children's mental health, caregiver attendance in youth psychotherapy sessions, within a system-driven implementation of multiple evidence-based practices (EBPs) in children's community mental health services. Method: Administrative claims from nine fiscal years were analyzed to characterize and predict caregiver attendance. Data included characteristics of therapists ( n = 8,626), youth clients ( n = 134,368), sessions (e.g., individual, family), and the EBP delivered.