Behavioral Health Billing Services
Behavioral health is broader than mental health alone. It sweeps in substance use disorder treatment, eating disorders and dual-diagnosis care across pediatric and adult populations, under code families a psychotherapy-only biller rarely touches: the alcohol and drug assessment, clinician-led group counseling, the per-diem codes for intensive outpatient, short-term residential and mental health partial hospitalization programs, and the screening and brief-intervention codes for SBIRT. The billing work those imply is program work rather than session work: a level-of-care authorization before admission, a daily attendance roster reconciled against the authorized days before any per-diem is billed, a continued-stay review packaged to the administrator's clinical criteria and submitted inside that plan's window, and a benefit decision on every co-occurring diagnosis. Behavioral health carve-out administrators — Carelon Behavioral Health, Magellan, Optum Behavioral Health — run prior authorization, level-of-care and continued-stay pathways separate from the medical-side utilization management on the same member's ID card, and the windows and criteria they apply are set in the specific plan document and provider manual, by product and effective date, not by a single industry rule.
That is the work we take on. We read the plan, date-stamp what it said, and build the submission calendar backwards from it. We reconcile the authorized days, the attendance roster and the posted per-diems before anything is submitted, so an unattended day is never invoiced and an attended day never sits outside an authorization. We hold a per-plan matrix of which code set that payer and that state actually accept and confirm it before the first admission rather than after the first denial. The clinical record stays with the clinicians who write it; the calendar, the reconciliation and the appeal are ours.
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How is behavioral health billing different from mental health billing?
Behavioral health billing is broader than outpatient psychotherapy, and the extra scope is program-level and substance-use care billed on HCPCS per-diem codes rather than CPT session codes: intensive outpatient, mental health partial hospitalization, short-term residential without room and board, the alcohol or drug assessment, and clinician-led group counseling. The billing work that goes with them is different too — a level-of-care authorization before admission, authorized days reconciled against the attendance roster before per-diems are billed, each continued-stay review packaged to the behavioral carve-out's own clinical criteria and filed inside that plan's window, and co-occurring diagnoses routed to the right benefit. Two rules sit over the top: parity under MHPAEA, which is enforced by different agencies depending on who sponsors the plan (CMS, read 17 September 2026), and each plan's own utilization-management terms, which are set per product and per effective date rather than nationally. We run that program side of the revenue cycle, not just the session codes.
- Program per-diems: IOP H0015, mental health PHP H0035, short-term residential H0018 (without room and board)
- Assessment H0001, clinician-led group counseling H0005, SBIRT 99408/99409 — with G0396/G0397 where the payer is Medicare
- Authorized days reconciled against the attendance roster before per-diems are billed, so an unattended day is never invoiced
- Continued-stay reviews packaged to the carve-out administrator's criteria and to that plan's own submission window
Who This Page Is For
Common Billing Friction in Behavioral Health
Level-of-care assignment and the H-code-to-CPT fallback
Level-of-care placement in substance use treatment is generally driven by the ASAM Criteria, a proprietary, licensed framework whose dimensional assessment and level definitions are published by the American Society of Addiction Medicine rather than by any payer or government source — so the specific dimension scores a plan wants, and the edition it is working from, have to be read out of that plan's own clinical criteria rather than assumed. What the codes themselves say is public: H0015 is defined as a program operating at least 3 hours a day and at least 3 days a week under an individualized treatment plan, H0018 is short-term residential without room and board, H0035 is mental health partial hospitalization of less than 24 hours. Some plans and some state programs do not recognize the H-code family at all and require CPT-only billing, which forces the same clinical day to be reconstructed as individual and group session units. That fallback is plan-specific and state-specific; we hold a per-plan matrix of which code set is accepted and confirm it before the first admission rather than after the first denial.
Continued-stay review windows, and reconciling authorized days to attendance
Residential and partial hospitalization programs require continued-stay utilization review at intervals the plan sets, and both the interval and the submission window are terms of that specific plan and product with their own effective date — not an industry standard, and not portable from one payer to the next or from one product to another inside the same payer. A missed window does not simply delay the next authorization; on many plans it removes the authorization for the period under review, which converts days already delivered into a takeback. The operational control is a reconciliation, not a reminder: authorized days on one side, the daily attendance roster on the other, billed per-diems on the third, matched before submission so that no unattended day is invoiced and no attended day sits unauthorized. Where an administrator requires a verbal review in addition to the written packet, that call is a second deadline and is tracked as one. Night and weekend admissions are where the calendar breaks, because the clinical documentation is written after the review clock has already started.
Group therapy charge capture and the per-patient rule
CPT 90853 is group psychotherapy reported per patient per session, not once per group, and the substance-use group code H0005 describes clinician-led group counseling and is priced and routed separately. The charge-capture failure is structural: a program that posts one 90853 for a group of eight has billed one eighth of the encounter and will not see the gap as a denial, because nothing was denied. Payers generally require the note to record group size, the individual goals addressed and that patient's own clinical response, and specific size limits and documentation requirements are set in each plan's behavioral health policy rather than by a common rule — so the limit that applies to your contract is the one in your contract. We reconcile attendance rosters to posted charges for every group session and surface the difference as a line item rather than a percentage.
SBIRT coding, and what MHPAEA parity actually reaches
SBIRT screening and brief intervention is reported with CPT 99408 (15 to 30 minutes) and 99409 (over 30 minutes), but both carry status N — non-covered — on the CY2026 Medicare physician fee schedule; for Medicare the payable codes are G0396 and G0397, which describe the same 15-to-30-minute and over-30-minute alcohol or substance abuse structured assessment and brief intervention. Billing 99408 to Medicare is not an underpayment, it is a non-covered service. Either way the time and the validated instrument have to be documented. Parity is narrower than it is usually described: MHPAEA prevents plans that cover mental health or substance use benefits from applying more restrictive financial requirements and treatment limitations to them than to medical and surgical benefits, but it does not require a plan to cover those benefits at all, it does not apply directly to small group health plans, and Medicare, Medicaid and CHIP are not group health plans within it. Enforcement splits by plan sponsor: the Departments of Labor and the Treasury have jurisdiction over private sector group health plans, HHS over non-Federal governmental plans, and state insurance departments regulate the insurance a plan purchases. The 2024 final rules added an explicit requirement that plans perform, document and produce comparative analyses of any non-quantitative treatment limitation — prior authorization, network composition, out-of-network reimbursement methodology — which is the document to request when continued-stay denials fall on behavioral health and not on the medical side.
Telehealth place of service and the audio-only conditions
Audio-only is allowed under Medicare, but not on the terms it is usually described. Medicare's definition of an interactive telecommunications system includes two-way, real-time audio-only technology for any telehealth service furnished to a patient in their home, on the condition that the distant-site practitioner is technically capable of audio and video but the patient is not capable of, or does not consent to, video — and the claim must carry modifier 93 to attest that those conditions were met (FQ for RHCs and FQHCs). That is a patient-capability test, not a blanket allowance for psychotherapy, and it is codified at 42 CFR 410.78(a)(3). The same regulation, at 410.78(b)(4)(iv)(D), conditions mental health telehealth furnished without a geographic restriction on the practitioner having furnished an in-person service within the 6 months before the first telehealth service and within 6 months of any subsequent one. Place of service follows where the patient actually was, and state Medicaid programs set their own audio-only coverage independently of Medicare — mismatched place-of-service and modifier combinations are the most mechanical denial in the specialty and the easiest to prevent.
Behavioral Health-Specific Payer Issues We Watch For
UnitedHealthcare
Issue: Level-of-care documentation is expected with the initial authorization request on many behavioral products, and a first submission without the assessment attached is treated as incomplete rather than as a clinical disagreement
Our approach: We attach the completed level-of-care assessment to every initial authorization request and cite the specific dimensional findings in the clinical justification, using the criteria that plan publishes rather than a generic template
Cigna
Issue: Continued-stay review intervals and submission windows for residential and partial hospitalization are set per plan and per product with their own effective date; on many of them a late submission removes the authorization for the period under review rather than merely delaying the next one
Our approach: We read the window out of the plan document and provider manual, date-stamp what it said, and set the submission trigger and escalation alert from that — then re-check it at renewal, because these terms move with the product year
Humana
Issue: Some plans and some state programs do not accept the behavioral H-code family and require CPT-only billing, which turns a program day into session units and produces bulk denials for facilities that bill the same way everywhere
Our approach: We maintain a per-plan, per-state matrix of which code set is accepted and confirm it before the first admission, so the day is built as session units from the start rather than rebilled after rejection
Medicaid
Issue: State Medicaid programs set their own behavioral health benefit and their own covered levels of care, and some do not cover residential treatment at the level a clinical assessment recommends
Our approach: We verify the specific Medicaid plan's covered level of care before admission and flag every case where the recommended level of care exceeds what the plan covers, so the conversation happens before the stay rather than after the denial
What We Handle
Group therapy and IOP per-diem billing (H0015, 90853, H0005)
Per-patient posting on 90853 with attendance rosters reconciled to charges, group-size and individualized-goal documentation checked against the plan's own behavioral policy, H0015 per-diem coding against the code's own definition of at least 3 hours a day and at least 3 days a week, and H0005 clinician-led group counseling routed to the correct benefit.
SUD and residential program coding (H0001, H0005, H0018, H0035)
Assessment H0001, short-term residential without room and board H0018, and mental health partial hospitalization H0035 billed against the level-of-care documentation the plan's own criteria require. CPT fallback applied where a plan or state program does not recognize the H-code family.
Continued-stay review calendars and authorization-to-attendance reconciliation
Review intervals and submission windows taken from each plan's own document and provider manual, date-stamped, and worked backwards into a submission calendar with a verbal-review step where the administrator requires one. Authorized days, attendance roster and billed per-diems reconciled before submission so no unattended day is invoiced and no attended day sits outside an authorization.
SBIRT screening and brief intervention (99408, 99409, G0396, G0397)
Time-documented SBIRT billing with validated instrument attestation. G0396 and G0397 used where the payer is Medicare, because 99408 and 99409 are non-covered on the Medicare physician fee schedule; modifier 25 on a same-day E/M only where the screening triggered a separately identifiable evaluation.
Dual-diagnosis benefit routing and MHPAEA parity protection
Co-occurring diagnoses routed to the medical benefit or the behavioral carve-out per the contract's configuration. Where a pattern of non-quantitative treatment limitations falls harder on behavioral health than on medical and surgical benefits, we assemble the denial record and point you to the comparative analysis the 2024 MHPAEA final rules require the plan to produce on request.
Telehealth place of service and audio-only modifier discipline
Place of service selected from where the patient actually was, modifier 95 for audio-video and modifier 93 where the audio-only conditions in 42 CFR 410.78(a)(3) were met and can be evidenced. A state-by-state Medicaid audio-only matrix, because state programs set their own rules and do not follow Medicare's.
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Key Behavioral Health CPT Codes
| CPT Code | Description | Medicare Amount CY2026 national, non-facility |
|---|---|---|
| 90837 | Individual psychotherapy, 60 minutes | $167 |
| 90853 | Group psychotherapy, per patient | $30 |
| 90847 | Family psychotherapy with patient present, 50 minutes | $110 |
| H0015 | Alcohol and/or drug services; intensive outpatient program, per diem | No Medicare fee schedule amount |
| H0018 | Behavioral health; short-term residential, without room and board, per diem | No Medicare fee schedule amount |
| H0001 | Alcohol and/or drug assessment | No Medicare fee schedule amount |
| 90791 | Psychiatric diagnostic evaluation | $173 |
| H0035 | Mental health partial hospitalization, less than 24 hours | No Medicare fee schedule amount |
Amounts are the Medicare national unadjusted non-facility amounts for CY2026, computed from the published CMS relative value file. They are not what a commercial payer pays, and your locality adjustment moves them. A dash means Medicare publishes no amount for that code — because it is non-covered, bundled, or priced outside the fee schedule.
Why General Billing Teams Miss Behavioral Health Issues
General billing staff handle dozens of specialties and rarely develop the depth needed for behavioral health coding nuances. Here is what gets missed.
Modifier and bundling errors
Specialty-specific modifier rules and CCI edits are frequently overlooked by teams that do not work exclusively in behavioral health.
Under-coding high-complexity visits
Behavioral Health encounters often qualify for higher-level E/M codes, but generalist billers default to mid-level codes to avoid audit risk.
Missed payer-specific rules
Each payer has unique coverage and documentation requirements for behavioral health procedures that general teams rarely memorize.
Slow denial turnaround
Without specialty knowledge, appeal letters lack the clinical specificity needed to overturn behavioral health denials quickly.
“The expensive failure in behavioral health is not the denied claim — it is the day that was delivered, attended and documented but sat outside an authorization because a continued-stay review went in after that plan's window. Nobody denies it; it just never becomes money.”
MedPrecision Billing Team
Behavioral Health Billing Compliance Officer
Transition Plan
Switching billing partners should not disrupt patient care or cash flow. Our transition plan is designed for zero downtime.
Discovery and Specialty Audit
We review your current behavioral health billing workflows, denial patterns, and payer mix to build a tailored onboarding plan.
System Integration
We connect to your EHR and practice management system, configure specialty-specific code sets, and validate charge capture workflows.
Parallel Billing Period
We run billing in parallel with your current process for 2-4 weeks to verify accuracy before taking over completely.
Full Transition and Reporting
Once validated, we assume full billing responsibility with monthly reporting dashboards and a dedicated account manager.
Behavioral Health Billing Terms
- ASAM Criteria
- The American Society of Addiction Medicine's multidimensional framework for matching a patient to a level of substance use treatment. It is a proprietary, licensed publication rather than a payer or government standard, so the edition and the specific dimensional documentation a plan expects have to be read out of that plan's own clinical criteria.
- Concurrent Review
- Utilization review conducted during a stay to authorize continued services. The interval and the submission window are terms of the specific plan and product, with their own effective date, and are not portable between payers or between products inside one payer.
- Level of Care (LOC)
- The intensity of treatment services provided, from early intervention and outpatient care through intensive outpatient, partial hospitalization, residential and medically managed intensive inpatient. Each level carries its own staffing, service and documentation requirements, and determines which per-diem or session code family applies.
- Intensive Outpatient Program (IOP)
- A structured program that, in the HCPCS definition of H0015, operates at least 3 hours a day and at least 3 days a week under an individualized treatment plan, and includes assessment, counseling, crisis intervention and activity therapies or education. Billed per diem or per session depending on the payer.
- Dual Diagnosis
- The presence of co-occurring mental health and substance use disorders in the same patient. Requires careful coding to capture both conditions and bill services under the appropriate benefit category for each payer.
- Per-Diem Billing
- A flat daily rate for a residential or partial hospitalization day that bundles the services delivered in that 24-hour period. The rate comes from the contract rather than from a published fee schedule, and the day is only billable where it is both attended and authorized.
Last updated: 2026-09-17
Common Questions
Common questions about behavioral health billing services.
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Request ReviewHow do you handle billing for residential treatment programs?
We bill residential treatment on the per-diem code that matches the level of care — H0018 is behavioral health short-term residential without room and board — and we reconcile three things before anything goes out: the authorized days, the daily attendance roster and the posted per-diems. Continued-stay reviews go in on the interval and inside the window that specific plan and product set, which we read out of the plan document rather than assuming from another payer, and we date-stamp what it said. Per-diem rates come from your contract, not from a published schedule.
What is the difference between behavioral health and mental health billing?
Behavioral health billing encompasses a broader scope including substance abuse treatment, addiction services, and residential programs in addition to traditional mental health services. It involves different authorization processes, level-of-care assessments, and distinct CPT and revenue code sets.
Can you bill for both group and individual therapy on the same day?
Often, but it is a contract question rather than a general rule. Where a plan allows it, the two services need distinct documentation with their own start and stop times and their own clinical content, and the modifier that separates them is applied only where the note supports it. We check the specific plan's behavioral health policy before billing the combination, because the plans that disallow it tend to recoup rather than deny.
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