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CPT code 90837 describes individual psychotherapy lasting 53 minutes or more. It is published by the American Medical Association and used across all major payer systems — Medicare, Medicaid, and commercial insurers — to represent a standard outpatient therapy session. This is the code most clinicians think of as the "hour session," though the actual minimum threshold is 53 minutes of face-to-face clinical time.

Unlike evaluation and management (E/M) codes that measure provider work across multiple domains, 90837 is fundamentally a time-based code. The face-to-face duration with the patient is the primary billing driver. This makes accurate time documentation not just helpful, but clinically and legally essential. A session that runs 52 minutes must be billed as 90834 — the 45-minute code — even if the clinical content was identical to a 55-minute session billed under 90837.

The code applies to individual patients only. Group therapy is billed under separate codes (90853 for standard group, 90849 for multi-family group). It covers the full range of evidence-based psychotherapy modalities — cognitive behavioral therapy (CBT), dialectical behavior therapy (DBT), psychodynamic therapy, trauma-focused approaches, and others — without specifying the clinical method used. The provider selects 90837 based on time and setting, not on the theoretical orientation of the treatment.

The single most common billing error with 90837 is misunderstanding the time threshold. The AMA's coding rules establish a minimum of 53 minutes of face-to-face psychotherapy time for this code. This is not a guideline — it is a hard floor. Sessions below this threshold must be billed under a lower-level code regardless of the clinical complexity involved.

Understanding how 90837 fits within the family of individual psychotherapy codes is critical for accurate billing. The selection is based entirely on the duration of the face-to-face encounter:

The AMA's "time-range" approach means that the code selected must reflect the midpoint rule — a session must reach or exceed the midpoint between two codes before the higher code can be billed. For 90837, that midpoint is 53 minutes. Documenting "approximately 60 minutes" without specifying the actual start and end time is a documentation gap that invites denial or audit scrutiny.

CPT 90837 can be billed by a wide range of licensed behavioral health providers, subject to payer-specific credentialing and scope-of-practice requirements. The code does not specify a provider type — but the payer absolutely does. Always verify your credentialing status for psychotherapy codes with each specific insurer before billing.

Supervision arrangements also affect billing: a session provided by a supervised trainee or unlicensed clinician must be billed under the supervising provider's NPI in most cases, with the supervisory relationship clearly documented in the chart. Incident-to billing rules for psychotherapy are complex and payer-specific — when in doubt, bill under the rendering provider's own NPI.

Time is necessary for 90837, but it is not sufficient. Every session billed under this code must also be medically necessary — meaning the treatment must be appropriate for the patient's diagnosed condition, delivered at an appropriate level of intensity, and reasonably expected to improve the patient's clinical status. Payers can and do deny 90837 claims when medical necessity documentation is weak, even when the time threshold is clearly met.

Medical necessity for 90837 is established through three interconnected elements: a qualifying diagnosis, a documented treatment plan, and session notes that demonstrate ongoing clinical progress — or a clinically meaningful explanation of why progress has plateaued.

Documentation for 90837 must satisfy two masters simultaneously: it must prove the time threshold was met, and it must demonstrate medical necessity. A technically compliant note that lacks clinical substance will fail a medical necessity review. A clinically rich note that omits time documentation will fail a billing audit. Both elements are non-negotiable.

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  Exact session start and end time Record the precise time the face-to-face encounter began and ended. "Session: 10:00 AM – 11:05 AM" is the standard. Avoid vague language like "approximately 60 minutes" — it is not defensible in an audit.
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  Date of service and place of service The date must match the claim exactly. The place of service code (11 for office, 02 for telehealth non-home, 10 for telehealth patient's home) must be accurately reflected in both the note and the claim.
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  Patient presenting concerns and clinical content Summarize what the patient brought to the session, the clinical issues addressed, the therapeutic interventions used, and the patient's response. Notes must reflect individualized treatment — not generic templates repeated session after session.
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  Mental status examination A brief MSE — covering appearance, behavior, mood, affect, thought process, cognition, and insight — should appear in every session note. It establishes clinical baseline and supports ongoing medical necessity.
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  Progress toward treatment goals Connect the session content to the patient's documented treatment plan goals. Whether progress is being made or stalling, the note should explain why continued treatment at this frequency and duration remains clinically indicated.
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  Risk assessment (where applicable) For patients with any active or historical safety concerns, a brief risk assessment covering suicidal ideation, self-harm, and harm to others should be documented at every session. Omitting this for high-risk patients creates both clinical and liability gaps.
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  Plan for next session Document the planned focus, any homework or between-session tasks assigned, and the scheduled next appointment. This forward-looking element reinforces the active, goal-directed nature of the treatment and supports medical necessity.
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  Provider signature and credentials Every note must be signed with the rendering provider's full name, credentials, NPI, and date of signature. Electronic health records that auto-populate these fields still require the provider to actively finalize and sign the note before billing.

CPT 90837 is covered by virtually all major payer types, but coverage conditions, session limits, and authorization requirements vary significantly. Knowing the rules for each payer in your panel is essential for clean claim submission and avoiding mid-treatment surprises.

The Mental Health Parity and Addiction Equity Act (MHPAEA) requires commercial insurers to apply no more restrictive limits to mental health benefits than to comparable medical/surgical benefits. If a payer imposes a session limit on 90837 that it does not apply to comparable medical codes, this may constitute a parity violation — which can be challenged through state insurance commissioner complaints or formal appeals.

90837 is the most generously reimbursed individual psychotherapy code, reflecting the time and clinical investment involved in a full 60-minute session. Rates vary by payer, geography, and provider type — but the following benchmarks provide a reliable reference point for practice planning and fee schedule negotiations.

For comparison, 90834 (45-minute session) typically reimburses at 75–80% of the 90837 rate. The additional 15 minutes of face-to-face time required for 90837 produces a meaningfully higher fee — which is why accurate time documentation has a direct and measurable financial impact on practice revenue. A practice billing 90834 when 90837 was justified is leaving real money on the table with every session.

For psychiatrists who provide both psychotherapy and medication management in the same session, CPT 90837 is not the right code — even when the session runs 60 minutes or more. Instead, the AMA designates specific add-on codes that pair a psychotherapy component with an evaluation and management (E/M) service billed by the physician.

Understanding the distinction between 90837 (standalone psychotherapy) and 90838 (psychotherapy add-on with E/M) is a common source of confusion in psychiatric billing. Using the wrong code can result in bundling denials, claim rejections, or compliance exposure during a payer audit.

Telehealth delivery of psychotherapy has become standard practice across the behavioral health landscape, and 90837 is fully billable via synchronous audio-video platforms under both Medicare and most commercial payers. The time requirement does not change for telehealth — 53 minutes of face-to-face video contact is still required. The rules that change are the place-of-service code and, in some cases, the modifier.

One important documentation requirement for telehealth: the session note must explicitly state that the service was delivered via synchronous audio-video technology, and should record the patient's location (city and state) at the time of the session. Interstate practice laws apply — if your license is in State A and the patient was physically in State B during the session, you must comply with State B's licensure requirements, regardless of where the session was scheduled.

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  Billing 90837 for sessions under 53 minutes This is the most frequent audit finding for this code. If your session ran 48 minutes, the correct code is 90834 — full stop. Rounding up to the next code is upcoding, regardless of intent, and creates significant compliance exposure.
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  Vague or missing time documentation Notes that say "session lasted approximately one hour" without timestamps will not hold up to payer scrutiny. Document exact start and end times in every note, every session, without exception.
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  Copy-paste or cloned session notes Payers and auditors flag charts where session notes are identical or near-identical across multiple dates. Each note must reflect the individualized content of that specific encounter. Templates should serve only as a structural framework — never as a substitute for specific clinical content.
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  Billing 90837 for psychiatry combined sessions When a psychiatrist provides both therapy and medication management in the same visit, the correct approach is an E/M code plus the appropriate add-on (90833, 90836, or 90838) — not standalone 90837. This is one of the most common psychiatric billing errors.
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  Missing or outdated treatment plans A session billed without an active, current treatment plan lacks the foundation for medical necessity. Plans should be reviewed and updated at regular intervals and whenever the patient's clinical status changes significantly.
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  Incorrect place-of-service code for telehealth Using POS 11 (office) for a telehealth session — or using the wrong telehealth POS — causes claim rejections and payment delays. Review your EHR settings to ensure POS codes auto-populate correctly based on session delivery mode.

Because 90837 is the highest-volume individual therapy code, it is also one of the most frequently audited. Both commercial payers and Medicare contractors conduct routine and targeted audits of behavioral health claims, and 90837 is consistently in scope. A well-prepared practice can survive any audit with minimal disruption — an unprepared one faces claim recoupment, corrective action plans, and in serious cases, exclusion from payer networks.

If your practice receives an audit request — whether a targeted review, a pre-payment review, or a comprehensive audit — respond promptly, completely, and with organized documentation. Engage a behavioral health billing compliance consultant if the scope is significant. The cost of expert guidance is almost always less than the cost of an unchallenged recoupment demand.

CPT code 90837 is the foundation of outpatient psychotherapy billing — and getting it right matters both financially and clinically. The rules are straightforward: document the exact time, demonstrate medical necessity, individualize every session note, and verify your credentialing and telehealth compliance with each payer. When those fundamentals are solid, 90837 is a clean, well-reimbursed code that accurately reflects the value of a full therapeutic hour.

Where practices run into trouble is almost always in the details — a missing timestamp here, a cloned note there, a treatment plan that has not been updated in six months. Building strong documentation habits into your clinical workflow from day one is the most effective compliance strategy available. It protects your revenue, your licensure, and most importantly, it ensures that the care you provide is accurately and honestly represented in the record.