Featured Case Study
Why a behavioral health claim was denied often comes down to two words: it depends.
A 90837 can pay cleanly for one patient and fail for the next. The code may be identical, yet the surrounding facts are not. One payer wants a different authorization, a clinician is still pending enrollment, a note supports 52 minutes when the claim requires 53, or the telehealth encounter carries the wrong place of service. So much can go wrong in behavioral health billing because the claim depends on context that is easy to separate from the encounter before it reaches the payer.
That does not mean behavioral health claims are always denied more often than medical claims. The public data are mixed, and the answer changes by service. Virginia carriers reported a 25.6% denial rate for substance-use-disorder claims in 2024, compared with 17.9% for medical and surgical claims; mental-health claims came in at 17.0%. The useful point is not the ranking, but how sharply the result moves when the service, payer, level of care, or benefit design changes.
A familiar code can carry a surprising amount of context.
Take psychotherapy. Medicare places 90832 and 90833 in the 16-to-37-minute range, 90834 and 90836 at 38 to 52 minutes, and 90837 and 90838 at 53 minutes or more. Those thresholds leave little room for a note that records scheduled time, rounds the session, or blends psychotherapy with administrative work.
Medication management makes the encounter more useful to the patient and more exacting on the claim. When an E/M service and psychotherapy occur together, the note has to support two distinct services. Psychotherapy time stands on its own; E/M time does not count toward it. The same visit can be entirely appropriate and still leave the payer unable to see what belongs to which service.
Family therapy turns on another small fact with a large billing consequence: whether the patient participated. Code 90846 applies without the patient present; 90847 applies when the patient is there. Group therapy adds a second recordkeeping problem. The common session needs documentation, but so does each patient’s individual participation and response.
Authorization has to travel with the episode.
Behavioral health care rarely fits neatly inside one date of service. Treatment continues, authorization balances decline, plans renew, clinicians change, and the level of care may move from outpatient therapy to IOP, PHP, or a more specialized service. Yet authorization is often handled as a front-end event: obtained once, recorded somewhere, and expected to remain accurate as the episode evolves.
That is how clinically appropriate care lands outside an approved date range, exceeds the remaining units, or gets billed under a provider the payer did not authorize. Texas Medicaid, for example, requires prior authorization for psychotherapy after 30 encounters in a calendar year and for additional psychiatric diagnostic evaluations after its rolling-year limit. Another payer may use a different visit count, unit structure, provider restriction, or review point.
Specialized services make the gap more expensive. Depending on the payer and benefit, TMS coverage may depend on diagnosis, prior treatment history, session sequence, and provider requirements. Spravato introduces dose, drug-acquisition, supervision, and observation requirements. ABA authorizations may be specific to the service, units, clinician role, setting, and treatment period. The authorization is not background information, but part of the reimbursement decision on each claim.
Telehealth created another version of the encounter.
The patient knows where the visit happened. Now the claim has to describe it in the payer’s language.
CMS distinguishes POS 10 for telehealth provided in the patient’s home from POS 02 when the patient is somewhere else. Commercial plans and Medicaid programs can layer on their own modifier, provider-location, consent, or enrollment requirements. A claim can carry the right diagnosis and service code and still fail because the patient location, clinician location, modifier, or payer record does not agree.
This is especially easy to miss in a multi-state organization. The clinical workflow feels consistent to the therapist; however, reimbursement requirements may change at the state line, with the plan product, or when a newly hired clinician begins seeing patients before enrollment catches up.
The note has to explain why care continues.
Behavioral health documentation is asked to do two jobs at once: support the service delivered today and show why the treatment remains reasonable over time. Medicare expects the record to address diagnosis, symptoms, functional status, treatment plan, prognosis, progress, and the patient’s ability to participate in and benefit from psychotherapy. Greater frequency or longer duration calls for stronger evidence of why that intensity still fits the patient.
That is where templated notes become risky since a note can be complete enough to prove attendance and still say very little about changing symptoms, response to treatment, progress toward goals, or the rationale for continuing at the same frequency. The longer the episode, the more visible that repetition becomes.
Growth reveals where reimbursement knowledge lives.
A single practice can compensate for variation with experienced people who know the payers, clinicians, and recurring exceptions. A platform operating across states and acquired groups cannot depend on memory at that scale.
One location may verify behavioral health benefits separately from medical eligibility. Another may store authorization balances in a spreadsheet. A newly acquired clinic may use different telehealth defaults. Provider enrollment may be complete for the organization but not the service location or plan product. None of those differences looks dramatic alone but across thousands of recurring encounters, they become the denial rate.
The prevention work is specific.
Good behavioral health billing does not require another person to inspect every claim. The right facts need to stay attached to the encounter long enough to shape the decision.
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Before care, verify the behavioral health benefit, network participation, authorization terms, provider restrictions, and remaining units.
- At documentation, capture actual psychotherapy time, patient participation, modality, location, and the separate work behind combined services.
- Before submission, test the service against the payer, authorization, rendering provider, place of service, and medical-necessity requirements that apply to that encounter.
- After payment, group denial codes by payer, service, provider type, location, and authorization status. A repeated pattern belongs upstream, not in another monthly spreadsheet.
What changes when the model works.
A national behavioral care network faced this problem while growing through new providers, locations, and acquisitions. The network more than doubled providers, growing to more than 2,500 across 90 locations. Hiring billers at the same rate would have preserved the old process, not fixed it.
The organization moved routine reimbursement decisions earlier and kept its specialists on the claims that required judgment. Manual review fell from about 80% of claims to less than 25%. Half now move through without biller touch, at least one quarter are corrected automatically, and less than one percent remain in backlog, with processing measured in hours, not days.
That result came from making the organization’s own reimbursement expertise repeatable. The people remained accountable for the standard but applying it manually to every encounter became a thing of the past.
A denial should change more than the report.
Resolving a denial can recover payment for one encounter while leaving the cause untouched. In behavioral health, where treatment often continues week after week, the same billing condition may already affect several more visits.
A recurring TMS denial may warrant a change to authorization checks. A 90837 pattern may call for closer review of documented time. Telehealth denials concentrated under one plan may justify a payer-specific correction. Each calls for a different response—and a check that the change improves subsequent claims.
See how reimbursement intelligence supports those decisions in behavioral health billing.
Sources
1. CMS Medicare Coverage Database: Billing and Coding: Psychiatry and Psychology Services
2. CMS Medicare Coverage Database: Psychiatric Diagnostic Evaluation and Psychotherapy Services
3. CMS: Telehealth and Remote Monitoring
4. Texas Medicaid Provider Procedures Manual: Behavioral Health
5. Virginia Bureau of Insurance: 2024 Mental Health and Substance Use Disorder Claims Data
6. GAO: Medicare Advantage Prior Authorization Criteria for Behavioral Health Services
