Mental Health Billing: 90834 vs 90837 Documentation That Survives Audit

Outpatient psychotherapy is billed using time-based CPT codes. CPT 90832: psychotherapy, 30 minutes with patient (16 to 37 minutes range). CPT 90834: psychotherapy, 45 minutes with patient (38 to 52 minutes range). CPT 90837: psychotherapy, 60 minutes with patient (53 minutes or longer). The CPT time ranges (sometimes called the substantial portion rule) determine which code is correct: 38 minutes is 90834; 52 minutes is 90834; 53 minutes is 90837; 90 minutes is 90837. The time captured is face-to-face therapy time with the patient (including time on the telehealth platform when applicable). Time spent on documentation, billing, or pre-session review is not counted. Time spent with family members in family therapy is counted only when the patient is present (otherwise different family therapy codes apply). Add-on codes 90785 (interactive complexity) and 90840 (additional 30 minutes for crisis psychotherapy) extend the base codes when applicable.

The 2026 Medicare payment for psychotherapy by code: 90832 around $75, 90834 around $100, 90837 around $148. The 90837 vs 90834 difference is roughly $48 per session. For a clinician seeing 25 to 30 sessions per week, billing 90837 instead of 90834 when warranted captures $1,200 to $1,500 per week per clinician, which annualizes to $60,000 to $75,000 per provider per year. Commercial payer rates often exceed Medicare for behavioral health (which is unusual; most specialties are paid at or near Medicare). The rate differential has made 90837 a focus of payer audit and downcoding programs since at least 2018, intensified in the 2025-2026 cycle. Practices billing 90837 must document to survive review.

90837 is the correct code when the actual face-to-face therapy time was 53 minutes or longer. Common clinical scenarios that warrant 90837. Trauma processing sessions (EMDR, prolonged exposure, intensive grief work) where the therapeutic process requires extended time to complete a session phase safely. Complex case management where multiple presenting problems must be addressed in the session. Initial intake and assessment sessions when extended history-taking and treatment planning are warranted (note: 90791 may be the more appropriate code for diagnostic interview without medical services). Couples or family therapy where the dynamics require extended time. Documentation requirements that pass audit. The session note must include a specific time entry: 'Session start: 2:00 PM. Session end: 3:05 PM. Total face-to-face therapy time: 65 minutes.' Vague phrases like 'extended session' or 'longer than usual' fail audit. The note content should reflect the work that filled the time: multiple therapeutic interventions documented, multiple presenting problems addressed, evidence of extended depth in the work. A 90837 session that has the same content depth as a typical 45-minute session does not survive audit even if the time documentation is technically correct.

Major commercial payers have implemented 90837 review programs that warrant practice-specific awareness. UnitedHealthcare runs an automated 90837 review at the claim adjudication stage that compares billed 90837 frequency against population norms and against the documented session length detected in submitted records. Practices billing 90837 at significantly higher rates than peer norms get flagged for chart review. Anthem implemented similar review for 2025. Several BCBS plans have added 90837 utilization review with provider letters when utilization exceeds threshold. Cigna increased post-payment review of 90837 claims, with takeback letters issued for sessions where documentation does not support the 53-minute threshold. The trend: payers are not denying 90837 outright, but they are auditing utilization patterns and recovering payment when documentation is weak. The defense is consistent documentation across every 90837 session. Practices that document the same way regardless of payer or session see lower takeback rates than practices that vary documentation effort.

Mental health services have retained expanded telehealth flexibility post-PHE. The 2026 CMS PFS continues to allow audio-and-video telehealth for established patients without geographic or originating-site restrictions for behavioral health. Documentation requirements: append modifier 95 (synchronous telemedicine via real-time interactive audio and video telecommunications system) to the psychotherapy code, use the appropriate place of service (POS) code (POS 02 for telehealth provided other than in patient's home, POS 10 for telehealth provided in patient's home), and document the technology used and the patient's location. Audio-only telehealth has narrower coverage and specific code requirements (consult the most recent payer policies). Many commercial payers require the patient's location and the technology platform to be documented in the session note. Common error: billing telehealth without modifier 95, which can trigger denials or downcoded payment depending on payer.

An audit-ready 90837 session note template includes the following elements. Header: date, session start time, session end time, total face-to-face time, modality (in-person, audio-video telehealth, audio-only telehealth), location of patient if telehealth. Presenting problems addressed: explicit list. Therapeutic interventions used: explicit list (cognitive restructuring, exposure work, mindfulness, EMDR phases, etc.). Patient's response and progress: descriptive of the work and the patient's engagement. Plan and homework: between-session work assigned. Risk assessment: when applicable. The presence of these elements signals to an auditor that the session was substantive and consistent with 90837 work. Templates that produce notes lacking these elements (especially missing time entries or vague intervention lists) fail audit.

The CPT time range for 90834 is 38 to 52 minutes. Most routine outpatient psychotherapy sessions fall in this range. Practices billing 90834 routinely have less audit exposure than practices billing 90837 routinely. The decision to bill 90834 vs 90837 should be driven by actual session time, not by revenue maximization. A practice that bills 90837 on every session regardless of actual time invites the payer audit pattern that triggers takebacks. A practice that bills accurately based on documented time captures the correct revenue and avoids the audit risk. The discipline: time the session, document the time, bill the code that matches. Sessions running 40 to 50 minutes are 90834. Sessions running 53 minutes or longer are 90837.

Group therapy uses CPT 90853 (group psychotherapy other than of a multi-family group) without a time component. The session length is not the billing trigger; the format is. Group therapy in commercial settings typically has size limits per payer policy (often 4 to 12 patients in the group). Family therapy uses CPT 90847 (family or couples psychotherapy with patient present, 50 minutes) or 90846 (family psychotherapy without patient present, 50 minutes). Time is implied at 50 minutes; sessions notably shorter or longer should consider the underlying CPT guidance. Family therapy without the identified patient present (90846) is a frequent point of clinical ethics discussion and payer policy variation. Verify coverage for 90846 with each payer before billing routinely.

Three common errors that erode mental health billing accuracy. Error one: time documentation gaps. Sessions billed as 90834 or 90837 without explicit time entries. Easy fix with EHR template prompts. Error two: 90837 utilization disconnected from actual session time. Practices billing 90837 routinely on sessions that ran 45 to 50 minutes face audit takeback exposure. Easy fix with discipline: time the session, billing matches the time. Error three: telehealth modifier and POS errors. Sessions delivered via telehealth without modifier 95 or with the wrong POS code. Easy fix with EHR templates and front-end controls that capture session modality automatically.

Mental health is one of our growing specialty lines. We support practices with billing audit on 90834/90837 utilization patterns, EHR template review for time documentation, payer-specific 90837 review pattern monitoring, telehealth coding compliance, and CCM/BHI capture for integrated primary care plus behavioral health practices. Pricing starts at 2.49 percent of net collections with no setup fees. The math: for a practice with 6 clinicians averaging 25 sessions per week each, accurate 90837 capture (where clinically warranted by actual session time) plus telehealth coding accuracy plus reduced takeback exposure typically captures 8 to 15 percent of additional sustained revenue compared to baseline. Use /guides/billing/behavioral-health for the behavioral health specialty playbook and /tools/cpt-lookup for current 2026 payment by code.