What are the most common billing codes for mental health and psychotherapy?
The most common mental health CPT codes include: 90791 (Psychiatric Diagnostic Evaluation), 90832 (Psychotherapy, 30 min / 16-37 actual min), 90834 (Psychotherapy, 45 min / 38-52 actual min), and 90837 (Psychotherapy, 60 min / 53+ min). When psychotherapy is combined with medical management by a psychiatrist or psychiatric NP, add-on codes 90833, 90836, and 90838 must be used.
1. Navigating the Mental Health Carve-Out Minefield
Unlike medical billing, behavioral health benefits are frequently outsourced by commercial health plans to third-party Managed Behavioral Healthcare Organizations (MBHOs) like Optum Behavioral Health, Magellan Health, or Carelon.
Failing to identify the carve-out at pre-registration leads to claims being routed to the medical administrator, waiting 30 days for adjudication, and resulting in complete claim rejection.
2. Psychotherapy Time Rules & CPT Code Selection
Applying the CPT Time Rule correctly to avoid overpayment recoupment
CPT guidelines utilize the midpoint rule for individual psychotherapy sessions:
• CPT 90832 (30 minutes): Actual face-to-face duration must be 16 to 37 minutes.
• CPT 90834 (45 minutes): Actual face-to-face duration must be 38 to 52 minutes.
• CPT 90837 (60 minutes): Actual face-to-face duration must be at least 53 minutes.
When psychiatric providers provide medical medication management alongside therapy, bill the appropriate E/M code (e.g., 99213 or 99214) with add-on psychotherapy code 90833 (30 min) or 90836 (45 min).
3. Telehealth Behavioral Health Billing Rules
Telehealth remains a permanent cornerstone for psychiatric and counseling care. In 2025:
• POS 10: Telehealth Provided in Patient's Home (paid at standard non-facility rate for Medicare).
• POS 02: Telehealth Provided Other than in Patient's Home.
• Modifier 95 or FQ/FR (for audio-only encounters) must be appended according to individual payer guidelines.