Mental Health CPT Codes 2026: Complete Billing & Coding Guide

Mental health billing is built on a set of CPT codes that are deceptively straightforward on the surface, and routinely miscoded in practice. The difference between billing 90837 and 90834 is 15 minutes of documented session time and potentially $30–50 per session. Multiply that across 200 sessions per month, and an undercoding pattern costs your practice $72,000–$120,000 per year. An overcoding pattern exposes you to payer audits and potential recoupment.This guide covers every major mental health CPT code category in 2026, individual therapy, psychiatry E/M, group therapy, psychological testing, crisis services, and collaborative care, with the documentation requirements, session time thresholds, and common billing errors for each.

Individual Psychotherapy CPT Codes

Individual psychotherapy codes are time-based. The documented session time must support the billed code. Time is measured as face-to-face time with the patient, not preparation, documentation, or phone calls (unless billing time-based add-ons for interactive complexity).

Standard Individual Therapy (Without E/M)

• 90832, 30 minutes (16–37 minutes of face-to-face psychotherapy)
• 90834, 45 minutes (38–52 minutes of face-to-face psychotherapy)
• 90837, 60 minutes (53+ minutes of face-to-face psychotherapy)

 Documentation requirement: The session note must record the start and stop time of the clinical encounter, the treatment modality used (CBT, DBT, psychodynamic, etc.), the presenting issues addressed, the patient’s response to interventions, and the plan for the next session. A note that only documents ‘supportive therapy provided’ without times or clinical detail will not survive a payer audit.Common error: Billing 90837 (60 minutes) for sessions that ran 45–50 minutes. If documented time does not clearly exceed 52 minutes, bill 90834.

Psychotherapy With Evaluation and Management (Add-On Codes)

When a physician (MD or DO) or other qualified healthcare professional provides both psychotherapy and an E/M service in the same session, they may bill the psychotherapy as an add-on to the E/M using:

• 90833, Psychotherapy add-on, 30 minutes (16–37 min), with E/M
• 90836, Psychotherapy add-on, 45 minutes (38–52 min), with E/M
• 90838, Psychotherapy add-on, 60 minutes (53+ min), with E/M

 These codes require a separate, identifiable E/M service, not just a medication check folded into the therapy note. The E/M and psychotherapy components must be separately documented. Billing the add-on codes without a separately identifiable E/M is a common audit target.

Interactive Complexity Add-On

90785, Interactive complexity is an add-on code that can be reported with any time-based psychotherapy code when the session involves specific documented complexities: the need to manage behaviors that interfere with the delivery of care, caregiver involvement in the session, a patient with communication barriers (language, cognitive impairment), or evidence-based approaches that require adaptation. Interactive complexity adds approximately $10–20 per session and is frequently under-utilized because clinicians do not recognize when it applies.

Psychiatry Evaluation and Management Codes

Psychiatrists who provide medication management, with or without psychotherapy, bill E/M codes based on medical decision making (MDM) or total physician time.

Psychiatric Diagnostic Evaluations

• 90791, Psychiatric diagnostic evaluation (no medical services)
• 90792, Psychiatric diagnostic evaluation with medical services

 90791 is used for initial diagnostic evaluations performed by non-prescribers (therapists, psychologists). 90792 includes medical assessment and is used by psychiatrists and other prescribers. These codes are typically used for initial assessments, not ongoing sessions. Billing 90791 for an ongoing established patient session that is not a new diagnostic evaluation is a common miscoding error.

Psychiatry E/M: Established Patient Office Visits

For ongoing psychiatric care (medication management with or without brief therapy), psychiatrists bill standard outpatient E/M codes:

• 99212, Straightforward MDM or 10–19 minutes total time
• 99213, Low complexity MDM or 20–29 minutes total time
• 99214, Moderate complexity MDM or 30–39 minutes total time
• 99215, High complexity MDM or 40–54 minutes total time

 2026 guidance: Psychiatric patients with multiple psychiatric diagnoses, medication adjustments, and risk assessment documentation typically support moderate or high-complexity MDM. Document the specific data reviewed (prior records, lab results, collateral history), the management decisions made, and the risk assessment explicitly in every note.

Group Psychotherapy CPT Codes

• 90853, Group psychotherapy (not multiple-family group)
• 90849, Multiple-family group psychotherapy

 Group therapy is billed per patient, per session. A group of 10 patients generates 10 claims, each for 90853. The therapist’s note must document: group composition (number of patients), session duration, topics addressed, each patient’s participation and response (either in individual notes or in a group note with individualized comments), and therapeutic interventions used.Critical parity point: Many commercial payers require prior authorization for group therapy, particularly for IOP and PHP programs. The MHPAEA parity requirement means payers cannot apply stricter auth requirements to group psychotherapy than they apply to comparable medical group services. Track payer-specific group auth requirements separately from individual therapy auth requirements.

Psychological Testing CPT Codes

Psychological and neuropsychological testing is billed based on the type of test administered and whether services are performed by the psychologist or a technician under supervision:

• 96130, Psychological testing evaluation (first hour), psychologist
• 96131, Psychological testing evaluation (each additional hour), psychologist
• 96132, Neuropsychological testing evaluation (first hour), psychologist
• 96133, Neuropsychological testing evaluation (each additional hour), psychologist
• 96136, Psychological or neuropsychological test administration (first 30 min), technician/computer
• 96137, Psychological or neuropsychological test administration (each additional 30 min)

 Testing codes require a written report signed by the psychologist, documentation of the specific tests administered, time spent in each component, and integration of results into a clinical summary. The report must be in the record before billing. Billing testing codes without a completed, signed report is a compliance violation.

Crisis Services and Other High-Acuity Codes

• 90839, Psychotherapy for crisis (first 60 minutes), requires documented psychiatric emergency
• 90840, Psychotherapy for crisis (each additional 30 minutes)
• 99483, Cognitive impairment assessment (for dementia evaluations, typically in primary care)

 Crisis intervention codes (90839, 90840) require documentation that the patient presented in a psychiatric emergency requiring immediate intervention, not just a high-intensity session. These codes carry the highest reimbursement rates for psychotherapy and are the most frequently audited for appropriateness.

Collaborative Care Management Codes

Collaborative Care Management (CoCM) codes allow primary care practices that have integrated behavioral health services to bill for psychiatric consultation and care coordination:

• 99492, Initial care management (first 70 minutes in first calendar month)
• 99493, Subsequent care management (subsequent months, first 60 minutes)
• 99494, Add-on for additional 30-minute increments per month

 CoCM billing requires a documented registry of enrolled patients, a designated behavioral health care manager, and a consulting psychiatrist. These codes are significantly underutilized by primary care practices with integrated behavioral health, and represent a substantial untapped revenue stream.

The Most Common Mental Health Billing Errors in 2026

1. Using Therapy Codes Instead of E/M Codes for Medication Management

A psychiatrist who provides a 25-minute medication management visit with brief supportive conversation should bill 99213 or 99214 (E/M), not a psychotherapy code. Using psychotherapy codes for what is primarily a medication management visit is a systematic miscoding pattern.

2. Incorrect Session Time Documentation

Billing 90837 (60 minutes) when session notes document ‘approximately 50 minutes’ or do not include start/stop times. Time-based codes require documented time. Without it, you are exposed to a 90837→90834 downcode on audit.

3. Billing Individual Codes for Group Sessions

Billing 90837 for a group psychotherapy session is an overcoding error. Group therapy is always billed as 90853, never with individual psychotherapy codes, even if the group had only two members.

4. Missing Prior Authorization for Higher Levels of Care

Billing IOP or PHP sessions without prior authorization approval results in technical denials. Even if services were clinically appropriate, technical auth failures are not appealable on clinical grounds.

5. Failure to Document Separately Identifiable E/M When Billing Add-On Therapy

When billing 90833/90836/90838 with an E/M code, the E/M component must be a separately identifiable service, not just a medication review embedded in a therapy note. Auditors look for distinct documentation of the E/M assessment.

Getting Mental Health Billing Right

Mental health billing is not complicated if your team understands the code structure, documents to the standard, and verifies payer-specific rules before submitting. But the volume of code options, the parity law complexity, and the payer-specific variations make it a discipline that rewards specialization.Right On Time Medical Billing specializes in behavioral health and mental health billing for practices of all sizes, solo therapists, group practices, and multi-site behavioral health organizations. Our certified coders understand time-based coding, E/M documentation standards, and parity law requirements. We offer a free billing review to identify your current coding accuracy and revenue optimization opportunities.