The AHCCCS SUD billing & coding field guide.
The ASAM level determines the level of care. The level of care determines the AHCCCS code, the unit, and the form. This is the working crosswalk for the biller, the coder, and the credentialing lead who own the Arizona Medicaid substance use disorder revenue cycle.
How to read this guideFive rules the ASAM level sets in motion.
On an AHCCCS SUD claim, the ASAM level of care is the origin point. It fixes the code, the unit, the place of service, the authorization path, and the modifier set. Everything downstream reconciles back to it.
Billing two levels of care on the same date of service.
One level-of-care per diem is payable per day. IOP (H0015) and PHP (H0035/S0201) cannot both bill the same day. Counseling codes H0004 and H0005 are bundled into the IOP per diem and are not billed alongside it. When the OTP weekly bundle (G2067 through G2075) is billed, its included counseling and toxicology are not re-billed as separate lines.
The crosswalkASAM level → service → AHCCCS code → unit / form.
The core of the guide. Read left to right: the ASAM level of care selects the service, which selects the AHCCCS code, which fixes the unit and the billing form. This is the single reference the biller works from.
| ASAM level | Service | AHCCCS code | Unit / form |
|---|---|---|---|
| 1.0 | Outpatient BH counseling | H0004 individual, H0005 group | H0004 per 15 min; H0005 group counseling |
| 2.1 | Intensive outpatient (IOP) | H0015 | Per diem, once/day, paired with revenue code 0906 on the UB-04 |
| 2.5 | Partial hospitalization (PHP) | H0035 (or S0201) | Per diem |
| 3.1–3.5 | Residential treatment | H0018 short-term, H0019 long-term >30d, H2036 SUD residential | Per diem; H0018 requires PA; codes are without room and board |
| 3.7–WM | Withdrawal management / detox | H0008–H0014 | Per diem |
| OTP / MAT | Opioid treatment program bundle | G2067–G2075 weekly bundle (incl. counseling + toxicology), G2076–G2080 add-ons | Weekly bundle; H0020 methadone admin, OTP, POS 58 |
| OBOT | Office-based opioid treatment | G2086 / G2087 / G2088 monthly bundle | Monthly; J2315 Naltrexone XR (Vivitrol) + 96372; Q9991 / Q9992 Buprenorphine XR (Sublocade) |
Assessment, planning & therapyThe codes before and around the level of care.
Assessment establishes medical necessity and the ASAM level. Treatment planning documents the level. Therapy and support codes fill the encounter. These are the lines that support and surround the per-diem level of care.
| Group | Service | AHCCCS code |
|---|---|---|
| Assessment | Alcohol / drug assessment | H0001 assessment, H0002 screening for admission |
| Assessment | SUD assessment / intervention | G0396 / G0397 |
| Assessment | Psychiatric diagnostic eval | 90791 (no med), 90792 (with med) |
| Planning | Treatment plan development | T1007 |
| Therapy | Psychotherapy 30 / 45 / 60 min | 90832 / 90834 / 90837 |
| Therapy | Group psychotherapy | 90853 |
| Therapy | Family / couple SUD counseling | T1006 |
| Support | Peer support | H0038 per 15 min |
ToxicologyPresumptive and definitive drug testing.
Toxicology is heavily rule-bound. Presumptive is billed once per date of service. Definitive is once per day and requires documented medical necessity per test. These frequency limits are a leading denial source when ignored.
| Test type | AHCCCS code | Frequency rule |
|---|---|---|
| Presumptive | 80305–80307 | Once per date of service |
| Presumptive lab | H0003 | Presumptive laboratory analysis |
| Definitive | G0480–G0483 | Once per day; medical necessity per test |
| Definitive classes | 80320–80377 | Definitive drug classes |
Per-diem & same-day rulesWhat may pair, what never pairs.
Per-diem logic governs the whole SUD claim. Most preventable denials trace back to a same-day pairing that AHCCCS does not allow, or an add-on billed without its parent.
H0015 once per day, on the UB-04, paired with revenue code 0906.
The IOP per diem line carries revenue code 0906 on the UB-04. Bundled counseling is not itemized. If a distinct MAT service is delivered the same day, it rides with modifier 25 on the E/M. That is the clean IOP encounter.
Modifier referenceThe four modifier families that clear a SUD claim.
A SUD claim carries a stack of modifiers: the program modifier, the rendering credential, the AHCCCS provider type, and, where applicable, telehealth and distinct-service modifiers. Each family answers a different question the payer asks.
AuthorizationTwo paths: FFS via DFSM, ACC via the plan portal.
Where the authorization goes depends on the member’s coverage. Fee-for-service authorizations submit through DFSM. ACC managed-care authorizations submit through the member’s plan portal. The level of care sets what documentation the authorization must carry.
Key rulesThe invariants that hold across every claim.
DenialsRoot cause → prevention.
Six root causes account for the recurring AHCCCS SUD denial pattern. Each has a documented prevention step that lives upstream of the claim. Fix the cause, not the appeal.
Who delivers and documentsThe rendering role drives the credential modifier.
The provider who delivers and documents the service determines the credential modifier and, downstream, whether the claim clears the panel check. Match the role to the code and the credential modifier.
This field guide is educational. Codes, units, frequency limits, modifiers, and authorization rules change. Re-confirm every element against the live AHCCCS source before you submit: the AHCCCS Medical Policy Manual (AMPM), the FFS Provider Manual Chapter 19, the Covered Behavioral Health Services Guide, and the AHCCCS Modifiers policy, along with the individual member’s plan requirements at the time of submission.
Common questionsFrequently asked: AHCCCS SUD billing.
Which ASAM levels map to which AHCCCS codes?
What are the per-diem and same-day rules for AHCCCS SUD?
Which modifiers matter most for AHCCCS SUD claims?
How does authorization work for AHCCCS SUD?
What is the timely filing rule for AHCCCS?
What are the top AHCCCS SUD denial root causes?
Losing AHCCCS SUD claims to preventable denials?
Send a sample of denied SUD claims. Inside 30 days, a written denial taxonomy mapped to these six root causes, the ASAM-to-code crosswalk applied to your service lines, and a modifier and authorization gap report. Yours to keep.