Behavioral Health Billing: Complete Coding and Authorization Guide

Behavioral health uses a distinct set of CPT codes that do not follow the standard E/M framework. Evaluations: 90791 (psychiatric diagnostic evaluation without medical services, ~$172 Medicare reimbursement) is used by psychologists, LCSWs, and LPCs for initial assessments. 90792 (psychiatric diagnostic evaluation with medical services, ~$210) is used by psychiatrists and psychiatric nurse practitioners who perform a medical examination as part of the evaluation. Therapy codes are time-based: 90832 covers 16 to 37 minutes of psychotherapy (~$68), 90834 covers 38 to 52 minutes (~$102), and 90837 covers 53 or more minutes (~$136). When a psychiatrist provides psychotherapy during the same visit as medication management, the E/M add-on codes apply: 90833 (16-37 min add-on, ~$51), 90836 (38-52 min add-on, ~$79), and 90838 (53+ min add-on, ~$104) are billed in addition to the E/M code (typically 99213 or 99214). Psychological testing uses 96130-96131 for evaluation services by a psychologist and 96136-96139 for test administration by a technician. Group therapy: 90853 (~$28 per patient). Family therapy: 90846 without the patient present (~$112) and 90847 with the patient present (~$117). Crisis intervention: 90839 for the first 60 minutes (~$188) and 90840 for each additional 30 minutes (~$96).

Behavioral health coding is fundamentally time-based, and the code you bill depends on how many minutes of face-to-face psychotherapy occurred during the session. The thresholds are strict with no rounding: 90832 requires 16 to 37 minutes, 90834 requires 38 to 52 minutes, and 90837 requires 53 or more minutes. If your progress note documents 37 minutes, you must bill 90832 ($68) rather than 90834 ($102) — a $34 per-session loss that, across 20 sessions per week, costs $680 weekly or $35,360 annually. If the note documents 53 minutes, you bill 90837 ($136) rather than 90834 ($102), capturing $34 in additional revenue per session. The documentation must include explicit start and stop times for the psychotherapy portion of the encounter. Total encounter time (check-in, paperwork, scheduling) does not count — only face-to-face psychotherapy time. Payers audit behavioral health time documentation aggressively. UHC and Cigna both flag providers who bill 90837 on more than 60% of sessions for medical review. Aetna's behavioral-health audit team requests progress notes for random claims and checks start/stop times against the billed code. If the times do not match the code, the payer recoups payment on the audited claim and may extrapolate the overpayment across all claims in the audit period — a devastating financial outcome. Document accurately every time.

Telehealth is now permanent for behavioral health following CMS's decision to make pandemic-era flexibilities permanent under the Consolidated Appropriations Act. But the billing rules are a patchwork that varies by payer, state, and service type. Medicare: Place of Service 10 (telehealth in patient's home) with modifier 95 for audio-video sessions. Audio-only sessions are allowed for established behavioral health patients using modifier 93, but reimbursement is reduced by approximately 15%. Medicare requires an in-person visit within 12 months for ongoing telehealth-based mental health treatment, with exceptions for patients in rural areas or those with documented barriers to in-person care. Commercial payers: Aetna uses modifier 95 with POS 02 for most telehealth services. BCBS varies by state plan — some require GT modifier, some accept 95, and some use POS 11 (office) with modifier 95 overlaid. UHC generally accepts POS 02 with modifier 95 but requires separate credentialing for telehealth services in some states. Cigna requires 95 modifier with POS 02 and limits telehealth to audio-video for most behavioral-health services. State Medicaid: every state has different telehealth rules covering eligible provider types, consent requirements, originating-site restrictions, and covered services. The only way to bill correctly is to check each payer's current telehealth policy before submitting claims, because these policies change as frequently as quarterly.

Most payers require prior authorization for behavioral health services and impose session limits that vary dramatically. UnitedHealthcare typically authorizes 20 sessions for individual therapy with re-authorization required before session 21. They request updated treatment plans showing measurable progress toward treatment goals as part of the re-auth process. Aetna commonly authorizes 12 sessions initially, with re-auth available in 12-session increments based on clinical justification. BCBS plans vary by state but generally authorize 20 to 30 sessions per calendar year, with a streamlined re-auth process for severe diagnoses (major depressive disorder, bipolar disorder, PTSD). Cigna authorizes in variable increments based on diagnosis severity — 8 to 12 sessions for adjustment disorders, 20 or more for trauma-related conditions. Medicaid managed care plans often authorize weekly sessions for three to six months and require re-authorization with an updated treatment plan. Exceeding authorized sessions without re-auth results in denied claims for every session over the limit, and retroactive authorization is rarely granted for non-emergent behavioral health services. The operational requirement: track authorized sessions per patient per payer in your practice management system, set alerts at 80% of the authorized limit, and submit re-authorization requests with updated treatment plans two to three weeks before the current authorization expires. A behavioral-health practice with 200 active patients across five payers may have 200 separate authorization expiration dates to manage simultaneously.

Behavioral health billing is uniquely affected by provider type, and the rules differ by payer in ways that create significant revenue risk. Psychiatrists (MD/DO) bill under their own NPI using both E/M codes (99213-99215) for medication management and psychotherapy add-on codes (90833, 90836, 90838) for combined visits. Psychologists (PhD/PsyD) bill evaluation and therapy codes directly and are the only providers eligible to bill psychological testing codes (96130-96131). Licensed clinical social workers (LCSWs) can bill Medicare directly at 75% of the physician fee schedule — meaning 90834 reimburses approximately $77 rather than $102. Licensed professional counselors (LPCs) gained Medicare billing eligibility on January 1, 2024, under the Bipartisan Budget Act provisions, also at 75% of the physician fee schedule. Licensed marriage and family therapists (LMFTs) similarly gained Medicare eligibility in 2024 at 75% reimbursement. Commercial payers vary: some credential and reimburse LCSWs, LPCs, and LMFTs at the same rate as psychologists, while others pay 10 to 25% less. Some commercial payers do not credential certain provider types at all in certain states. Supervision billing adds another layer: when a provisionally licensed clinician provides therapy under supervision, the supervising provider typically must bill under their own NPI, with incident-to rules varying by payer and state. Incorrect provider-type billing is a leading cause of behavioral-health recoupment audits.

The five most common behavioral-health denials each have specific prevention strategies. First: time does not match code — 90834 billed but only 35 minutes documented in the progress note. Fix: implement a time-tracking system within your EHR that auto-populates start and stop times, and train providers to review the time against the code before signing the note. Second: authorization expired — the patient's authorized sessions were exhausted and re-auth was not obtained. Fix: automated session-count tracking with alerts at 80% utilization. Third: telehealth modifier incorrect for the specific payer — GT used when the payer requires 95, or POS 02 used when the payer expects POS 10. Fix: maintain a payer-specific telehealth-modifier matrix and program it into your billing system. Fourth: frequency limit exceeded — the payer allows weekly sessions but twice-weekly was billed. Fix: verify frequency-limit rules during authorization and communicate limits to the treating provider at the start of each auth period. Fifth: diagnosis not covered under the patient's specific plan — adjustment disorders and V-codes (relational problems, bereavement) are excluded from coverage by some commercial plans. Fix: verify diagnosis-level coverage during eligibility checks and communicate coverage limitations to the provider before the first session.

Beyond accurate coding and authorization management, behavioral-health practices can capture significant additional revenue through three commonly missed strategies. First, bill for crisis intervention (90839/90840) when clinically appropriate — these codes reimburse at higher rates than standard therapy codes and are underutilized because many providers default to their standard therapy code even during crisis sessions. A 75-minute crisis session billed as 90839 plus 90840 reimburses approximately $284, compared to $136 for 90837. Second, capture psychological testing revenue when indicated. A comprehensive psychological evaluation (96130-96131 for the psychologist's time plus 96136-96139 for technician-administered testing) can generate $800 to $2,500 per evaluation depending on the battery of tests administered. Many behavioral-health practices refer testing out when their own psychologists could perform it in-house. Third, bill family therapy (90846/90847) and group therapy (90853) when clinically appropriate — these services diversify revenue and are increasingly covered by payers for conditions including substance use disorders, eating disorders, and adolescent behavioral issues. Go Medical Billing manages behavioral-health billing for dozens of practices and consistently identifies 10 to 15% in missed revenue during our initial chart review for new clients.