Specialty
Substance use treatment billing services
Substance use treatment billing services have to follow the patient through a continuum of care: screening and brief intervention, outpatient counseling, intensive outpatient and partial hospitalization per diems, withdrawal management, residential days and medication for opioid use disorder, each with its own codes, units, claim form and authorization.
See where claims are getting stuck. No patient data needed.
Remitwright gives treatment programs a dedicated biller who matches every claim to the level of care the assessment supports, keeps continued-stay reviews ahead of the approved end date, and bills Medicare's weekly bundles, Medicaid's H codes and commercial per diems the way each payer's manual says.
Substance use treatment billing is one of Remitwright's specialty billing services, each set out with its own code families, denial reasons and payer rules.
Last reviewed by the Remitwright billing team. Editorial policy
- 80305-80307
- 90791
- G2011
Denials
Why substance use treatment claims get denied
The reasons that come up most on substance use treatment remittances, with the usual cause and the fix. Code explanations are our own; the official list is maintained by X12.
| Code | Reason | Usual cause | The fix |
|---|---|---|---|
| CO-197 | Authorization absent or exceeded | Residential or intensive outpatient days billed past the continued-stay approval, or a step-down made clinically but never re-authorized at the new level | Approved days and units tracked by level of care on the census, with the next review requested before the last approved day and every step-up or step-down authorized before its first claim |
| CO-18 | Already billed; treated as a duplicate | A weekly opioid treatment bundle submitted twice inside the same seven days, or a per diem and its component services billed for the same date | One bundle per patient per week with the week start date fixed in the system, and component codes suppressed on any date a per diem is billed |
| CO-109 | Claim sent to the wrong payer | Substance use benefits managed by a behavioral health administrator, a county authority or a state fund with its own payer ID and claims address | The substance use benefit and where its claims go recorded at eligibility for every admission, and checked again at each level-of-care change |
| CO-16 | Claim lacks information | Revenue code, condition code or certifying practitioner missing on an institutional claim, or the taxonomy and program modifier a state wants on a professional claim | A claim template per level of care and payer built from the payer's companion guide, so an intensive outpatient claim leaves with its revenue code, condition code and certifying practitioner every time |
| CO-B7 | Provider not enrolled for this service on that date | Opioid treatment program enrollment not finished before the first week billed, or a counselor's credential type not covered by the plan for that code | Enrollment and credentialing completed before the first admission under each plan, with counselor credential types mapped to the codes each plan lets them bill |
| CO-50 | Not medically necessary | The level of care billed is higher than the documented placement assessment supports, or the treatment plan was not updated at the interval the plan requires | The placement assessment, the treatment plan and each continued-stay review filed against the dates billed, with any gap flagged before the claim is released |
| CO-151 | Units exceed what the payer allows | Counseling units past the daily limit, more than one per diem on a date, or drug tests past the plan's frequency rule | Per-payer unit and frequency rules in the scrubber, and definitive drug testing billed only when the order and the clinical reason are in the record |
Codes
Common substance use treatment codes and modifiers
Code families by number with our own one-line explanations. CPT descriptors belong to the AMA and are not reproduced here.
| Codes | What the family covers |
|---|---|
| 80305-80307, G0480-G0483 | Presumptive and definitive drug testing; each payer's policy sets how often each is covered and what the order has to say about why |
| 90791, 90832-90837, 90853 | Diagnostic evaluation, individual psychotherapy by session length and group psychotherapy, used for outpatient counseling delivered by licensed clinicians under the medical benefit |
| G2011, G0396, G0397 | Medicare's structured alcohol and drug screening with brief intervention, split into three codes by the time spent with the patient |
| G2067-G2080 | Medicare's opioid treatment program weekly bundles by medication, the bundle for a week with no medication, and add-ons for intake, periodic assessment, take-home supply and extra counseling |
| G2086-G2088 | Medicare's office-based opioid use disorder treatment codes, covering overall management, care coordination and individual and group psychotherapy for practices that are not opioid treatment programs |
| H0001-H0006 | Medicaid codes for alcohol and drug assessment, individual and group counseling, and case management; whether the unit is a session or 15 minutes, and which modifiers ride along, is set by each state |
| H0010-H0014 | Withdrawal management at different intensities, from ambulatory to medically managed residential; the state manual says which levels it pays and whether the unit is a day or a service |
| H0015, H0035, H2034-H2036 | Per diem codes for intensive outpatient, partial hospitalization and residential or halfway house treatment, one unit per day the patient attends and the program definition is met |
| H0020 | Methadone dispensing and administration at an opioid treatment program under Medicaid; whether the state pays it per visit or inside a bundle is in the state manual |
Modifiers that matter
- HF
- Marks a service delivered in a substance use program for the Medicaid programs and plans that require it; some states use it to route the line to the substance use benefit and its rate, so a missing HF can pay at the wrong rate or deny.
- HG
- Identifies an opioid addiction treatment program service for state Medicaid programs that pay opioid treatment separately from general behavioral health; the state manual says which codes carry it.
- 95 and 93
- Audio-video (95) and audio-only (93) telehealth. Medicare requires them on the opioid treatment program intake, periodic assessment and additional counseling add-on codes when those services are delivered remotely, with the place of service the payer asks for.
- HO, HN, HM and similar
- Medicaid credential-level modifiers that identify the counselor's licensure or certification level; which letters a state uses, and whether they change the rate, is set by that state.
- U modifiers
- State-defined modifiers that some Medicaid programs attach to substance use codes to mark the level of care, the setting or the program type; the state manual lists them and the claim is rejected without them.
Payers
Payer notes
- Medicare (opioid treatment programs)Medicare pays certified opioid treatment programs a bundled rate per weekly episode of care that depends on the medication, with add-on codes for intake, periodic assessment, take-home supply and additional counseling; a week with no medication is billed with the non-drug bundle plus at least one non-drug service, there is no copayment but the Part B deductible applies, and professional claims carry place of service 58.2
- Medicare (intensive outpatient and partial hospitalization)Intensive outpatient program services require a physician certification and plan of care for a minimum of 9 hours of service per week and may be furnished by hospitals, critical access hospitals, community mental health centers, FQHCs, RHCs and opioid treatment programs; partial hospitalization requires certification of at least 20 hours per week, recertified at least every 30 days, in hospital outpatient departments and community mental health centers.1
- Medicare (telehealth)The patient's home is a permitted originating site for treatment of a substance use disorder with no geographic restriction, and audio-only technology is allowed for behavioral and mental health telehealth when the patient is at home.5
- Medicare (telehealth regulation)Under 42 CFR 410.78, the home of a patient with a substance use disorder diagnosis has counted as an originating site since July 1, 2019 when the telehealth service treats that disorder or a co-occurring mental health disorder, and those services sit outside the geographic rule. Unlike the paragraph on mental health telehealth at home, this one attaches no in-person visit condition to payment.10
- MedicaidMedicaid is the single largest payer for mental health services in the United States and plays a growing role in paying for substance use disorder services; parity requirements reach Medicaid managed care organizations, alternative benefit plans and CHIP, and states shape their substance use benefits through state plan services, waivers and section 1115 demonstrations.6
- Medicaid (section 1115 substance use demonstrations)States with a substance use disorder demonstration commit to covering outpatient, intensive outpatient, medication assisted treatment, residential and inpatient care and medically supervised withdrawal management, to requiring providers to assess level of care with a multidimensional tool such as the ASAM Criteria, to an independent review of residential placements, and to a statewide average residential stay of 30 days.7
- Commercial plansUnder the Mental Health Parity and Addiction Equity Act, financial requirements and treatment limitations on mental health and substance use benefits cannot be more restrictive than the predominant ones applied to substantially all medical and surgical benefits, and the current rules apply that test to non-quantitative limits such as prior authorization.8
Authorizations
Authorization in substance use treatment follows the level of care. Medicare does not require prior authorization for opioid treatment program bundles, but the program has to be SAMHSA certified, accredited and enrolled before the first week is billed, and intensive outpatient and partial hospitalization need a physician certification and plan of care on file. Medicaid managed care plans and commercial plans authorize withdrawal management and residential care in days with continued-stay reviews, and intensive outpatient and outpatient counseling in days, units or sessions, and most expect a placement assessment that supports the level requested. Your biller tracks approved days and units against the census for each patient, requests the next review before the last approved day, and treats every step-up or step-down as a new authorization.
Documentation traps
- A level-of-care assessment that is missing, undated or supports a lower level than the per diem billed, which is the first thing a continued-stay reviewer and an auditor compare
- Per diem days without the attendance record behind them; an intensive outpatient claim has to be backed by the scheduled hours, the services delivered that day and the certifying practitioner's plan
- Group counseling notes that do not record the start and stop time, the number of participants and this patient's response, so the group code cannot be defended on review
- Patient consent for releasing treatment records to a payer not on file, so a records request for an audit or an appeal cannot be answered without going back to the patient
- Drug tests ordered on a standing schedule without a documented reason tied to the treatment plan, which payers deny as not medically necessary or past frequency
What a specialist checks
Specialist or generalist for substance use treatment billing?
A generalist biller can enter a substance use treatment claim. Whether it pays turns on three things specific to substance use treatment billing, and a specialty-aware biller checks each one.
Code families
Each family billed with what the chart has to show for it.
- 80305-80307, G0480-G0483
- 90791, 90832-90837, 90853
- G2011, G0396, G0397
Modifiers
Applied only where the note supports them, line by line.
- HF
- HG
- 95 and 93
If you are moving from another billing company or an in-house biller, switching billing companies follows a plan: the old and new processes run side by side until the new one is proven, and every login and every substance use treatment claim stays in your name.
What we handle
What we handle for substance use treatment providers
- Prior authorizationAuths requested, tracked, attached to claims
- Eligibility verificationCoverage and benefits checked before visits
- CredentialingEnrollment, CAQH and PECOS kept current
- Claim submissionScrubbed, submitted and tracked to acceptance
- Denial managementEvery denial read, worked and appealed
- A/R follow-upUnpaid claims chased before filing limits
A dedicated biller with named cover, working inside your system and reporting to you on one written page. How it works sets out the five stages.
Software
Systems substance use treatment providers usually run
Your biller works inside your system as a user you create. All the systems we work in.
Questions
Questions about substance use treatment billing
How does Medicare pay an opioid treatment program?
Through a bundled payment per weekly episode of care. The bundle code depends on the medication, with separate add-on codes for intake, periodic assessment, take-home supply and extra counseling, and a no-medication bundle for a week where the patient received only the non-drug services. Nothing can be billed twice for the same patient inside the same seven days. There is no copayment, but the Part B deductible applies, and professional claims go on the CMS-1500 with place of service 58.
How do we bill a week when the patient did not receive medication?
Medicare's rule is to bill the weekly bundle code that excludes the drug and then bill at least one service in the non-drug component, such as counseling or a periodic assessment. A week with the drug bundle but no dispensing is the kind of line that comes back in a medical review, so the dispensing record and the bundle have to agree before the claim leaves.
What is the billing difference between an intensive outpatient program and partial hospitalization?
For Medicare, hours and certification. Intensive outpatient needs a physician certification and plan of care for at least 9 hours of service a week and can be run by hospitals, community mental health centers, FQHCs, RHCs and opioid treatment programs. Partial hospitalization needs certification of at least 20 hours a week, recertified at least every 30 days, as an alternative to inpatient care. Hospital claims mark the program with a condition code. Commercial and Medicaid plans use their own per diem codes and hour definitions, so the plan's definition is recorded before the first claim.
Can counseling be delivered by telehealth?
Medicare allows the patient's home as the originating site for substance use treatment with no geographic limit, and allows audio-only when the patient is at home and cannot or will not use video. Telehealth for a diagnosed substance use disorder carries no in-person visit condition. The in-person rule that starts for services after December 31, 2027 covers mental health telehealth at home, and our post on Medicare telehealth billing through 2027 sets out the dates. Opioid treatment program add-ons delivered remotely carry modifier 95 or 93. Medicaid programs and commercial plans each set their own telehealth rules for substance use codes, and your biller keeps them per payer.
The patient was authorized. Why was the residential claim denied?
Residential and withdrawal management authorizations are measured in days with a continued-stay review before the next block. The usual causes are days billed past the review date, a step-down to a lower level that was made clinically but never authorized, or a plan that approved admission at one program and the patient moved to another. The fix is a census that shows approved days against days used for every patient, with the review requested before the last approved day.
Which codes does Medicaid use for substance use services?
Mostly H codes: assessment, individual and group counseling, case management, withdrawal management at several intensities, and per diems for intensive outpatient, partial hospitalization and residential care, plus methadone dispensing. Each state chooses which it pays, what the unit is, which program and credential modifiers go with them and which provider types may bill them, so the state's behavioral health provider manual is the authority, and managed care plans in that state usually follow it.
Does the parity law stop a plan from requiring prior authorization?
No. The Mental Health Parity and Addiction Equity Act requires that financial requirements, treatment limits and non-quantitative limits such as prior authorization on substance use benefits be no more restrictive than the predominant ones the plan applies to medical and surgical benefits. It limits how much stricter the plan can be; it does not remove the requirement. In practice the claim still needs the authorization, and a parity complaint is a separate route when a plan's rules look out of line.
What do you need from a treatment program to start?
A signed BAA, a user for your biller in your clinical record and clearinghouse, your SAMHSA certification and state license where they apply, each payer enrollment and each clinician's credentialing status, your current authorizations by patient and level of care, your payer contracts and the state manuals you bill under. Bring an aging report and a denial report to the review if you have them.
Next step
See where your substance use treatment claims are getting stuck.
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While you wait: see the sample weekly report or read how switching works. You can also download the sample weekly report (PDF).