Substance Abuse Treatment Billing Codes

Overview

Substance abuse treatment uses HCPCS codes: H0001 (comprehensive assessment), H0004 (individual counseling per session), H0005 (group counseling per session), H0015 (intensive outpatient program per session), H0019 (residential treatment per diem). Diagnoses use ICD-10 F10-F19 range. Mental Health Parity and Addiction Equity Act (MHPAEA) requires equal coverage for substance abuse treatment. Prior authorization typically required for IOP and residential programs. Documentation must show substance use disorder treatment goals and progress.

Coding Rules

H0001 covers substance abuse assessment and includes comprehensive evaluation. H0004 and H0005 are per-session codes, billed for each counseling session. H0015 covers intensive outpatient programs (minimum 9 hours/week structured programming). H0019 covers residential treatment per diem. ICD-10 F10 (alcohol), F11 (opioid), F12 (cannabis), F14 (cocaine), F15 (stimulant), F16 (hallucinogen) cover primary substances. Use secondary codes for polysubstance use. Do not bill H0004 and therapy codes on the same date for the same service.

Prior Authorization & Limits

Prior authorization is required by most payers for H0015 (IOP) and H0019 (residential treatment). Individual (H0004) and group (H0005) counseling require authorization after initial sessions or ongoing authorization depending on payer. MHPAEA requires equal coverage standards for substance abuse as other medical conditions; visit limits and copays must be equivalent. Some payers cover H0005 (group) at lower rates than H0004 (individual). Verify payer-specific coverage before treatment planning.

Bundling & Modifier Rules

Do not bill multiple counseling codes on the same date for the same patient unless services are genuinely distinct (individual and group on different times). Modifier 25 is not applicable to HCPCS substance abuse codes. If E/M is billed on the same date as counseling, document distinct services and verify payer policy on bundling. Revenue code 0905 (alternative behavioral health treatment) is used for facility-based substance abuse billing.

Documentation Requirements

Document primary substance(s) of abuse, frequency of use, and age of onset. Include substance use disorder diagnosis per DSM-5 criteria. Document treatment plan with specific goals (sobriety, abstinence, harm reduction). For H0004: note individual counseling topics and patient response. For H0005: document group attendance, participation level, and progress. For H0015: record weekly attendance, structured program participation, and clinical progress. Document any relapse events, triggers identified, and coping strategies taught.

Common Questions