Coding Behavioral Health Services

Documents Required

• Complete encounter/session note with presenting problem, interventions, patient response, and plan
• Time documentation (start time, end time, total face-to-face time)
• Treatment plan with goals, objectives, and interventions
• Diagnostic assessment or psychiatric evaluation (for initial visits)
• Psychological testing raw data and interpretation report (for testing services)
• Provider credentials and licensure documentation
• Prior authorization documentation (if applicable)

Step 1 — Code Psychiatric Diagnostic Evaluations

Select the appropriate evaluation code for initial assessments.

• 90791 — Psychiatric diagnostic evaluation: Comprehensive assessment including history, mental status exam, and treatment recommendations. No medical services. Typically 45–60 minutes but not time-based — report regardless of time spent.
• 90792 — Psychiatric diagnostic evaluation with medical services: Same as 90791 but includes medical assessment, medication review, and physical exam components. Reported by physicians (MD/DO) or qualified NPPs who can prescribe.
• These codes are used for initial evaluations — not for follow-up visits or ongoing treatment.
• Multiple sessions for a comprehensive evaluation are permitted (report 90791/90792 for each session with documentation justifying the need for multiple evaluation sessions).
• Do NOT bill 90791/90792 with same-day psychotherapy or E/M codes — the evaluation includes the therapeutic interaction on that date.

Step 2 — Code Psychotherapy Services (Time-Based)

Select psychotherapy codes based on face-to-face time with the patient.

Standalone psychotherapy (when no E/M is billed):

• 90832: 16–37 minutes of psychotherapy
• 90834: 38–52 minutes of psychotherapy
• 90837: 53+ minutes of psychotherapy

Add-on psychotherapy with E/M (when E/M is also billed):

• +90833: 16–37 minutes of psychotherapy, reported with E/M code
• +90836: 38–52 minutes of psychotherapy, reported with E/M code
• +90838: 53+ minutes of psychotherapy, reported with E/M code

Key rules:

• Time refers to face-to-face psychotherapy time with the patient (and/or family member), not total encounter time.
• Time spent on E/M activities (medication review, physical exam) is NOT counted toward psychotherapy time.
• Document start time, end time, and activities for both E/M and psychotherapy components when billing both.
• The add-on codes (+90833, +90836, +90838) can ONLY be reported with an E/M code — they cannot stand alone.
• If total psychotherapy time is less than 16 minutes, it is not separately reportable — it is included in the E/M service.

Step 3 — Code Medication Management and E/M

Apply E/M coding rules when medication management is the primary service.

• There is no standalone "medication management" CPT code — medication management is coded as an E/M service (99202–99215 for office, 99221–99233 for inpatient).
• Apply 2021+ E/M guidelines: MDM or time determines code level.
• For psychiatric medication management, MDM typically involves: prescription drug management requiring monitoring for toxicity (moderate risk), number of medications managed, complexity of medication interactions.
• When psychotherapy is also provided in the same encounter: bill the E/M code + add-on psychotherapy code (+90833/+90836/+90838).
• Time for E/M activities (reviewing records, discussing medications, coordinating care) is separate from psychotherapy time.

Step 4 — Code Psychological and Neuropsychological Testing

Apply testing code structure for assessment services.

• 96130: Psychological testing evaluation by psychologist, first hour (includes interpretation and report).
• +96131: Each additional hour of psychological testing evaluation.
• 96136: Psychological testing administration by psychologist, first 30 minutes.
• +96137: Each additional 30 minutes of administration by psychologist.
• 96138: Psychological testing administration by technician, first 30 minutes.
• +96139: Each additional 30 minutes by technician.
• 96132/+96133: Neuropsychological testing evaluation, first hour and additional hours.
• 96146: Computer-based psychological testing, automated interpretation.

Key rules:

• Evaluation codes (96130–96133) cover the psychologist's time reviewing results, integrating data, interpreting findings, and writing the report.
• Administration codes (96136–96139) cover the time spent administering tests face-to-face.
• Document each test administered, time per test, and administering provider.
• The report must document specific tests used, raw scores, standard scores, interpretation, and clinical recommendations.

Step 5 — Code Crisis Intervention and Intensive Services

Apply codes for acute behavioral health emergencies.

• 90839: Psychotherapy for crisis, first 60 minutes. The crisis must involve a life-threatening or highly complex psychiatric emergency.
• +90840: Each additional 30 minutes of crisis psychotherapy beyond the first 60 minutes.
• Crisis documentation requirements: Document the nature of the crisis, imminent danger assessment (suicidal ideation, homicidal ideation, psychotic decompensation), interventions performed, and disposition/safety plan.
• Crisis codes are not routine therapy sessions — they require documentation of an acute psychiatric emergency.
• H0034–H0037 (HCPCS): Community-based behavioral health services, including medication training, mental health assessment, and community psychiatric support. Used primarily by Medicaid-funded programs.
• Intensive Outpatient Program (IOP): Typically billed with revenue codes and HCPCS codes (S9480 for IOP per diem). Requirements vary by payer.
• Partial Hospitalization Program (PHP): Revenue code 0912/0913 with appropriate procedure codes. Must meet CMS criteria for partial hospitalization.

Step 6 — Apply Provider and Service Modifiers

Select modifiers based on provider credentials and service circumstances.

• Modifier HO: Services provided by a master's-level clinician (LCSW, LPC, LMFT). Required by some Medicaid programs.
• Modifier HN: Services provided by a bachelor's-level clinician. Some payers require this for behavioral health technicians.
• Modifier 95: Synchronous telehealth service via real-time audio/video. Apply when behavioral health services are delivered via telehealth platform.
• Modifier GT: Telehealth via interactive audio/video (some payers use GT instead of 95).
• Modifier 52: Reduced services — when a therapy session ends early (e.g., patient unable to tolerate full session but minimum time threshold is met).
• Modifier 25: Significant, separately identifiable E/M on same day as a procedure (e.g., E/M + psychotherapy on same day when billed with standalone psychotherapy code instead of add-on).
• Place of Service (POS): 11 (office), 02 (telehealth in patient's home), 10 (telehealth in healthcare facility), 22 (hospital outpatient), 52 (psychiatric facility), 53 (community mental health center).

Checkpoint B — Review

• Psychotherapy code matches documented face-to-face time (not total encounter time)
• Add-on psychotherapy codes are paired with an E/M code — never reported standalone
• E/M time and psychotherapy time are documented separately and do not overlap
• Provider credential matches the code billed and payer requirements for that credential
• Crisis codes are supported by documentation of an acute psychiatric emergency
• Testing codes distinguish between evaluation (interpretation) and administration time
• Place of service is correct for the encounter setting
• ICD-10-CM behavioral health diagnoses are coded to maximum specificity (e.g., F33.1 major depressive disorder recurrent moderate, not F32.9 unspecified)

Quality Audit

• Time documentation is internally consistent (start/end times match reported time ranges)
• Add-on psychotherapy frequency is proportionate to E/M visit volume (not every E/M has add-on therapy)
• Crisis code usage is reserved for genuine emergencies — not routine therapy sessions
• Provider credentialing is verified for each billing provider — state licensure + payer credentialing
• Treatment plan updates support ongoing medical necessity for continued therapy sessions
• Session notes document specific interventions used (CBT, DBT, motivational interviewing) — not just "supportive therapy"
• Prior authorization requirements are met for services that require them (testing, intensive programs)

Guidelines

• Follow AMA CPT guidelines for Psychiatry section (90785–90899) and E/M section for medication management
• Apply CMS Medicare Claims Processing Manual Chapter 12 §180 for psychiatric services billing
• Reference APA Practice Guidelines for evidence-based treatment standards
• Follow state-specific scope of practice rules for non-physician behavioral health providers
• Apply Mental Health Parity and Addiction Equity Act (MHPAEA) requirements for coverage parity
• Never bill psychotherapy time that exceeds the documented face-to-face time with the patient
• Mark with [VERIFY] any session where time documentation is missing or ambiguous
• Include disclaimer that behavioral health coding rules vary significantly by payer and state licensing requirements