Substance use disorder treatment is one of the most under-reimbursed and over-denied specialties in behavioral health. The coding is fragmented across multiple systems (HCPCS, CPT, and state-specific codes all in play at once), and parity compliance violations by insurers are routine. If you're running an SUD practice and not actively monitoring your denial rates by payer, you're almost certainly leaving money uncollected. This isn't a paperwork detail, it's a revenue line: practices that let this slide leave money uncollected every year.
Here's how billing works across the main SUD service categories in 2026, and where the money tends to disappear.
If you're working through these issues, our mental health billing services can help you address them systematically.
MOUD is the clinical and billing category for buprenorphine, naltrexone, and methadone-based treatment. The billing model depends on the setting.
Physicians and qualified practitioners prescribing buprenorphine in an office setting bill this as a standard E/M visit, 99212 through 99215 depending on MDM complexity. The prescription itself isn't separately billable; it's part of the E/M service. Drug testing (urine drug screens) can be billed separately using 80305–80307 or G0480–G0483 depending on the methodology.
The DEA waiver requirement for buprenorphine prescribing was eliminated in 2023 under the Mainstreaming Addiction Treatment (MAT) Act. Any DEA-licensed provider can now prescribe buprenorphine without a separate waiver. That opened up prescribing significantly, but billing compliance expectations didn't relax; your documentation still needs to support the visit level you're coding.
OTPs, licensed facilities providing methadone and other MOUD, bill Medicare through a bundled weekly payment system using HCPCS codes. This model changed substantially in 2020 and has continued to evolve.
| HCPCS | Description |
|---|---|
| G2067 | OTP: medication, counseling, individual & group, initial treatment week |
| G2068 | OTP: medication, counseling, individual & group, subsequent treatment week |
| G2069 | OTP: medication, counseling, subsequent week (on stable, longer-term patients) |
| G2070 | OTP (counseling, no medication) per week |
| G2071–G2080 | Various add-on codes for intensive services, toxicology, take-homes |
Medicaid OTP billing varies wildly by state, some states use the federal HCPCS structure, others have state-specific codes. If you operate in multiple states, you need payer-specific billing rules for each Medicaid program.
SBIRT is both a clinical protocol and a billing category. It's one of the most underused revenue streams in primary care and behavioral health practices.
| Code | Description | Who Bills |
|---|---|---|
| G0396 | Alcohol and/or drug assessment, 15–30 min | Physician/qualified provider |
| G0397 | Alcohol and/or drug assessment, 30+ min | Physician/qualified provider |
| H0049 | Alcohol and/or drug screening | Program/facility |
| H0050 | Alcohol and/or drug service: brief intervention | Program/facility |
| 99408 | Alcohol misuse screen + brief intervention, 15–30 min | Physician |
| 99409 | Alcohol misuse screen + brief intervention, 30+ min | Physician |
The G-codes are primarily Medicaid. The 99408/99409 codes work for commercial and Medicare. You need to document the screening tool used (AUDIT, DAST-10, CAGE, CRAFFT for adolescents), the score, and the intervention provided. Without that, these claims deny every time.
The Mental Health Parity and Addiction Equity Act (MHPAEA) requires that insurance plans not impose more restrictive treatment limitations on mental health and SUD benefits than they do on medical/surgical benefits. That's the law. In practice, payers violate it constantly, and most SUD providers don't push back.
What parity violations look like in billing:
The American Society of Addiction Medicine (ASAM) criteria are the clinical standard for determining the appropriate level of care in SUD treatment. Most payers use ASAM levels (0.5 through 4.0) as their medical necessity framework, even if they don't say so explicitly in their policies.
Your documentation needs to speak this language. A note that says "patient needs residential treatment" doesn't cut it. A note that documents the six ASAM dimensions (intoxication/withdrawal potential, biomedical conditions, emotional/behavioral conditions, readiness to change, relapse potential, and recovery environment), and supports the recommended level of care will hold up in an appeal.
| Service | Common Codes | Typical Requirement |
|---|---|---|
| Residential SUD (non-hospital) | H0010, H0018, H0019 | Prior auth, ASAM criteria, daily census reporting |
| Intensive Outpatient Program (IOP) | H0015 | 3+ hrs/day, 3+ days/week minimum |
| Partial Hospitalization (PHP) | S0201 | 6+ hrs/day, 5 days/week, active psychiatric component |
| Outpatient Individual Counseling | 90832–90837 | Per-session auth from many payers |
See how Rcmaxis handles the full scope of Substance Use Disorder billing on our Substance Use Disorder billing services page.
SUD services have their own compliance layer. Federal rules under 42 CFR Part 2 restrict how substance use treatment records can be disclosed, so releasing records to a payer for an appeal or audit has to follow consent requirements. Before you send documentation to support a denied claim, check whether the records are covered and whether the patient's consent is on file.
Payer reviews focus on medical necessity and level of care. Residential and intensive outpatient claims are checked against placement criteria, daily documentation, and required authorizations, and contractors can look back three years. Because these services bill by day or by program hour, a documentation gap on one level of care affects many claim lines at once.
SUD coverage varies a lot by state and by plan, so a payer matrix pays for itself quickly. For each major payer, record which services are covered, which codes they use, what authorization is required, and what documentation they expect. Add the contact for provider relations and the appeal deadline.
Update it every time you learn something new from a denial or a call. Give the billing team and the clinical team access. When a clinician asks whether a service is covered, the answer is a lookup, not a research project.
Alcohol and substance use screening with brief intervention is billed with time-based HCPCS codes. At 2026 non-facility Medicare rates, G0396 (15 to 30 minutes) pays $37.07 and G0397 (more than 30 minutes) pays $67.47. A clinic that delivers 100 interventions a month at the shorter level collects $3,707.00, and if 30 of them actually run past 30 minutes and are documented, it collects $912.00 more.
The money is modest per visit, but the codes are often missed because the intervention happens inside an E/M.
The larger dollars come from the visits around the intervention. A psychotherapy session under 90832 pays $85.84 and an established office visit under 99215 pays $192.39. If a practice has 40 visits a month where documented psychotherapy time or screening wasn't billed, at an average of $86 each, it leaves $3,434 a month and $41,203 a year on the table.
Billing for these services takes a time stamp and a short note, so build both into the template.
Screening, brief intervention, and referral to treatment is a clinical protocol and a billing category. The article lists G0396 for a 15 to 30 minute assessment and notes it's one of the most underused revenue streams in primary care and behavioral health.
That plans don't impose more restrictive treatment limits on mental health and SUD benefits than on medical and surgical benefits. The article explains how to spot violations in your denials and what to document when you appeal.
With HCPCS H-codes. The article lists H0010, H0018, and H0019 for non-hospital residential and H0015 for IOP, along with typical requirements such as prior authorization and placement criteria.
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Revenue check: The repayment math is unforgiving: a 3-year lookback on a recurring documentation gap here can grow into a sizable repayment demand, plus the cost of defending the appeal. Run a quarterly sample of 20 to 30 claims in this category against the supporting documentation. It's a small time investment that reliably catches five-figure problems before a payer does.
Keep this on a schedule: A short monthly reconciliation between what was documented and what was billed is one of the cheapest habits a billing team can build. For most practices it's the difference between catching a $10,000 to $25,000 problem early and finding it during an audit.
We know SUD billing: MOUD, IOP, residential, parity appeals. Let's look at what's hitting your denial queue and fix the upstream cause.
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