H-codes — Alcohol and Drug Abuse Treatment

Behavioral health services for substance use disorder treatment, primarily billed by state Medicaid programs.

H-codes (H0001-H2037) cover alcohol and drug abuse assessment, treatment, rehabilitation, and case management services. They are non-Medicare codes — Medicare uses CPT codes (90791-90899) for behavioral health — and are billed primarily by state Medicaid programs, community mental health centers, and SUD treatment providers.

H-codes often have state-specific rate schedules and prior authorization requirements. Common modifiers include HF (substance abuse program), HK (specialized mental health programs for high-risk populations), and HG (opioid addiction treatment).

Frequently-referenced H-codes:

• H0001 — Alcohol and/or drug assessment
• H0004 — Behavioral health counseling and therapy, per 15 minutes
• H0050 — Alcohol and/or drug services, brief intervention, per 15 minutes