HCPCS Level II code H0040 denotes an assertive community treatment (ACT) program billed on a per diem basis, reflecting intensive, team-based psychiatric services delivered in community settings. ACT programs target individuals with serious mental illness who require frequent, coordinated outreach, crisis management, and rehabilitation supports. Nationally, H0040 is important for aligning payment with high-intensity, non-inpatient behavioral health services and for enabling continued community-based care that can reduce hospitalizations.

Key payers considered include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code’s clinical intent and service setting, benchmarks for utilization where available, common billing considerations, and relevant policy and coverage themes affecting per diem behavioral health reimbursement. The publication also highlights how H0040 fits within broader efforts to support community mental health care delivery, program eligibility considerations, and implications for care coordination. Data not available in the input is noted where applicable.