Ben Weiss October 24, 2023 Billing, Facility Operations, EHR, Insurance Billing, The Treatment Community Understanding HCPCS and CPT Billing Codes for Outpatient Addiction Treatment: H0015, H2036, S0201, and S9480 Ben Weiss October 24, 2023 Billing, Facility Operations, EHR, Insurance Billing, The Treatment Community The two most important codes to understand for IOP are H0015, alcohol and drug services IOP program, and S9480, Intensive outpatient psychiatric services, per diem.