Billing for behavioral health services looks simple from the outside: a handful of codes, one clinician, one session at a time. That is exactly why it goes wrong. The codes are few, so payers scrutinize them harder: time thresholds, add-ons, telehealth place of service, authorization counts and a carve-out that routes the claim somewhere you did not expect.
Our mental health billing services cover solo therapists, group practices and behavioral health agencies. That includes billing services for therapists in private practice and behavioral health billing services for agencies running several programs at once. Some practices search for behavioral & mental health billing services, some for therapy billing services or therapist billing services; it is one team either way. If you are not yet on the panels you want, start with insurance credentialing for therapists same team, same file.
How billing for behavioral health services works
Billing for mental health services follows the same eight steps for every clean claim. Most denials trace back to one of the first three.
- Eligibility and carve-out check. Confirm the behavioral benefit, the copay or deductible, and which company actually manages it: the carrier, or a carve-out such as Optum or Evernorth.
- Authorization. Get the session block or testing hours approved before the visit, where the plan requires it.
- Documentation. Start and stop times, the modality, and a note that supports medical necessity for the code billed.
- Coding. The CPT code for the session, the ICD-10-CM diagnosis, and the place of service and modifier for telehealth.
- Scrub and submit. Outpatient sessions go out on a CMS-1500; IOP and PHP programs usually go on an institutional UB-04 with revenue codes.
- Payment posting. Post the ERA and check each payment against your contracted rate, not just against zero.
- Denials and appeals. Read the reason code, correct and refile or appeal within the payer's limit.
- Patient balance. Statements for the copay, coinsurance or deductible, sent in a way that respects the client relationship.
Diagnosis coding: ICD-10-CM on the claim
Clinicians often diagnose from the DSM-5-TR, but the claim carries the ICD-10-CM code, mostly from the F01 to F99 chapter. The two do not always line up one to one, and a code that is not specific enough is a common reason for a denial. ICD-10-CM updates every 1 October, so we review the diagnosis codes your clinicians use before the new codes take effect.
Who we bill for
- Counselors and marriage and family therapists Licensed counselors (LPC, LMHC, LPCC) and marriage and family therapists (LMFT), including Medicare claims: both became eligible to enroll in Medicare on 1 January 2024.
- Clinical social workers LCSW and LICSW, for commercial plans, Medicaid and Medicare.
- Psychologists Including psychological and neuropsychological testing.
- Group practices and behavioral health agencies Including IOP, PHP and substance use programs.
Prescribers bill differently, with E/M codes and psychotherapy add-ons. If your practice has a psychiatrist or PMHNP, see our psychiatric billing services.
The codes we bill every day
| CPT | Service | What gets it denied |
|---|---|---|
| 90791 | Psychiatric diagnostic evaluation, no medical services | Billed more than once per episode without justification; billed same day as a therapy code |
| 90792 | Diagnostic evaluation with medical services | Billed by a clinician not licensed to provide medical services (prescribers: see psychiatry billing) |
| 90832 | Psychotherapy, 30 minutes (16 to 37 min) | Session time not documented |
| 90834 | Psychotherapy, 45 minutes (38 to 52 min) | The workhorse code; denied when start and stop times are missing |
| 90837 | Psychotherapy, 60 minutes (53+ min) | Downcoded to 90834 when medical necessity for the longer session is not documented |
| 90846 / 90847 | Family psychotherapy, without / with patient present | Wrong code for who was in the room |
| 90853 | Group psychotherapy | Group size and duration not recorded |
| 90785 | Interactive complexity add-on | Billed as a standalone rather than an add-on |
| 90839 / 90840 | Crisis psychotherapy, first 60 min / each additional 30 | Used for a routine session that simply ran long |
The 90837 problem
The 60-minute code pays meaningfully more than the 45-minute one, and several payers audit it hard or downcode it by default. The defense is documentation: the actual start and stop times, and a clinical reason the longer session was necessary for this client. We flag 90837 patterns before a payer does, because a retroactive downcode across a year of sessions is a bill you do not want.
Medical billing for psychologists
Psychologists bill the same psychotherapy codes as other therapists, plus a set of testing codes most billers rarely see. Those testing codes are where psychologists' claims usually go wrong.
| CPT | Service | What gets it denied |
|---|---|---|
| 90791 | Psychiatric diagnostic evaluation | Billed again within the same episode without a reason |
| 96130 / 96131 | Psychological evaluation services by the psychologist, first hour / each additional hour | Time for interpretation, integration and feedback not documented |
| 96136 / 96137 | Test administration and scoring by the psychologist, first 30 minutes / each additional 30 | Billed for time a technician spent |
| 96138 / 96139 | Test administration and scoring by a technician, first 30 minutes / each additional 30 | Technician not recognized under that payer's rules |
| 96116 / 96121 | Neurobehavioral status exam, first hour / each additional hour | Time not separated from the rest of the evaluation |
| 96156 / 96158 | Health behavior assessment / intervention | Billed with a mental health diagnosis as primary, when these codes are for psychological factors in a physical condition |
Testing is the costly part. Many payers require prior authorization for psychological and neuropsychological testing, often with a cap on hours, and they want the tests used, the time per service and who did the work. We check the authorization before the testing day and match the units billed to the time documented. Psychologists do not bill office visit E/M codes or the diagnostic evaluation with medical services; those belong to prescribers. Practices with both should see psychiatry billing services.
Telehealth: place of service and modifiers
Behavioral health is the most telehealth-heavy specialty there is, and the claim rules are not uniform.
- POS 10 when the client is at home, POS 02 when they are somewhere else.
- Modifier 95 for synchronous audio and video; modifier 93 for audio only where the payer recognizes it.
- A few payers and state Medicaid programs still want GT.
- The client's location decides which state's contract applies: which is a credentialing question as much as a billing one. See telehealth credentialing.
POS 02 versus POS 10 alone can change the allowed amount. We set the rules per payer at go-live rather than discovering them through denials.
Authorizations
Most commercial behavioral benefits authorize a block of sessions and then require a clinical review to continue. Practices lose money in two predictable ways: sessions delivered past the authorized count, and a renewal filed after the last authorized session rather than before it.
We track the authorized count against sessions billed, warn the clinician before the block runs out, and file renewals on a schedule through our prior authorization services. Where a carve-out such as Optum or Evernorth owns the benefit, the review goes to them, not the carrier.
Substance abuse billing services
Billing for behavioral health services is not one workflow. SUD programs bill on a different footing: ASAM levels of care, per-diem and bundled rates for IOP and PHP, H-codes and revenue codes on institutional claims, and 42 CFR Part 2 confidentiality rules that change how records may be released. If you run an IOP or PHP alongside outpatient therapy, tell us, the two are billed and authorized quite differently.
What we do every week
- Eligibility and benefit checks before the first session, including the carve-out that owns the behavioral benefit.
- Charge entry and scrubbing against each payer's rules for time, modifiers and add-ons.
- Claim submission and clearinghouse rejection work, same week.
- Denial management: read, corrected, appealed and refiled, not written off.
- Authorization tracking against sessions billed.
- Payment posting and underpayment checks against your contracted rates.
- Patient statements and a copay process that does not alienate the client.
- Aged AR recovery, including the balances a previous biller gave up on.
- Monthly reporting on collections, denial reasons and days in AR.
We work in your EMR
No migration and no new license. Our billers log in to SimplePractice, TherapyNotes, TheraNest, Valant, ICANotes, AdvancedMD and the other systems behavioral practices actually use. See every system we support.
Billing and credentialing together
Practices that buy mental health billing and credentialing services as one engagement stop losing the month between an approved panel and a working claim.
- Not on the panels yet?Credentialing services for therapists CAQH, carve-outs, closed panels and Medicare.
- Prescriber in the practice?Psychiatry billing services E/M coding and medication management.
Mental health billing FAQs
How does billing for behavioral health services work?
Check eligibility and who manages the behavioral benefit, get any authorization, document the session with start and stop times, code it with CPT, ICD-10-CM and the right telehealth modifier, submit the claim, post the payment and work any denial. The steps are the same for every practice; the payer rules inside each step are what differ.
What is the difference between mental health billing and behavioral health billing?
Mental health billing usually means outpatient therapy and testing. Behavioral health billing is the wider term: it also covers substance use treatment and programs such as IOP and PHP, which bill per diem on institutional claims.
What CPT codes are used for mental health billing?
The core codes are 90791 for the diagnostic evaluation, 90832, 90834 and 90837 for individual psychotherapy by time, 90846 and 90847 for family therapy, 90853 for group, 90785 for interactive complexity and 90839 and 90840 for crisis sessions. Psychologists add the 96130 to 96139 testing codes.
Why do mental health claims get denied?
The usual causes are missing start and stop times, a 90837 without documented medical necessity, the wrong telehealth place of service or modifier, sessions past the authorized count, and claims sent to the carrier when a carve-out manages the behavioral benefit.
Can therapists bill Medicare?
Clinical social workers and psychologists always could. Licensed mental health counselors and marriage and family therapists have been able to enroll and bill Medicare since 1 January 2024. See Medicare enrollment.
How much do mental health billing services cost?
A percentage of what we collect, so we only do well when you do. The rate depends on your session volume and payer mix. Credentialing is quoted separately, per provider per payer, and discounted when you use both.
Why does my 90837 keep getting paid as a 90834?
Because the note did not establish that a 53-minute-plus session was clinically necessary, or the start and stop times were missing. It is the most common behavioral downcode there is, and it is fixable in the documentation template rather than in the appeal.
Do you work with solo therapists?
Yes, most of our behavioral clients are solo or two to three clinicians. A solo practice gets the same denial work and the same reporting as a group.
Can you work our old aged AR?
Yes, and we usually find money in it. Behavioral AR ages badly because the balances are individually small, so a previous biller writes them off in bulk. Timely filing limits apply, so the sooner we look the better.
Do you bill for IOP and PHP programs?
Yes. Those are per-diem or bundled and often go out on institutional claims with revenue codes, which is a different workflow from outpatient therapy. Tell us at the start so we set both up properly.
Talk to a behavioral health biller
Searching for mental health billing services near me? We are in Fairfax, Virginia and bill for practices in more than 30 states. Send us a month of claims and your aged AR. We will tell you what is being denied, why, and what is recoverable.
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