CPT code 90837

CPT code 90837 is the highest-paying standard individual psychotherapy code in outpatient behavioral health. It’s also one of the most frequently billed psychotherapy codes, but clinicians often misunderstand its correct application. CPT 90837 is often called the "60-minute code," but the time-based threshold for billing the code is a minimum of 53 minutes. Misunderstandings of code 90837 and its uneven application across your clinical panel can not only lead to revenue leak from undercoding and denials resulting from time mismatches; it can also generate  patterns of coding mistakes that payer AI detects and flags for a recovery auditor. 

What is CPT code 90837 used for?

CPT code 90837 describes individual psychotherapy lasting 60 minutes, covering face-to-face sessions of 53 to 67 minutes. The code applies to all individual psychotherapy modalities delivered in outpatient settings, including cognitive behavioral therapy, dialectical behavior therapy, EMDR, prolonged exposure, psychodynamic therapy, acceptance and commitment therapy (ACT), and others.

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Licensed clinical social workers (LCSWs), licensed professional counselors (LPCs), licensed marriage and family therapists (LMFTs), clinical psychologists, and psychiatrists are all eligible to bill 90837, as long as the session meets the time threshold and the provider is credentialed with the payer. Psychiatrists who combine psychotherapy with an evaluation and management service on the same date use the add-on code 90838 alongside the appropriate E/M code—not a standalone 90837. Billing a standalone 90837 alongside an E/M code creates a bundling conflict that typically results in the psychotherapy component being denied.

The 2026 Medicare reimbursement rate for CPT 90837 in non-facility settings is $167.00 per session—the highest among the standard individual psychotherapy codes and approximately $53 more than CPT code 90834. Master's-level providers (LMFTs, LMHCs) are reimbursed at 75% of the standard rate, or approximately $125.25. Commercial insurance contracted rates typically range from $125 to $185 or more, depending on payer, geography, and provider credentials.

That per-session value—the highest in the psychotherapy code family—also means 90837 attracts proportionally greater scrutiny from payers, recovery audit contractors, and OIG investigators than any other routine psychotherapy code.

Meeting the 53-minute threshold

The most important feature of CPT 90837 is also the one that creates the most variance and problems: the code does not require a full 60 minutes of face-to-face time. It requires 53.

That gap has real consequences in both directions. A therapist whose sessions consistently run 54 to 58 minutes might bill CPT 90834 because the sessions aren’t reaching a full 60 minutes.  But this would technically be chronic undercoding that costs the practice money. On the flip side, a therapist whose sessions routinely last 50 minutes who defaults to 90837 because it's "close enough" is systematically overcoding and will likely have difficulty defending those claims under review. 

Like CPT code 90832 and CPT code 90834, 90837 counts only direct face-to-face time with the patient. Documentation, care coordination calls, and note-writing after the session close do not count toward the threshold. This is a meaningful distinction for any provider who spends time on non-face-to-face work adjacent to sessions.

Why "60-minute code" is a misnomer that creates real billing problems

The "60-minute" language in the code descriptor describes a typical session length, not a billing requirement. But it creates a common documentation problem in practice: providers who are billing appropriate 90837 sessions often document "60-minute session" in their notes rather than their actual start and stop times. That imprecision makes legitimate, compliant claims indistinguishable from overcoded ones when a payer algorithm or auditor reviews the documentation.

The fix is straightforward but requires habit change: document actual start and stop times on every note. "Session conducted 1:03 PM to 2:01 PM (58 minutes face-to-face)" is defensible. "60-minute session" is not. If every note in a practice says "60 minutes" regardless of whether the session ran 54 minutes or 61 minutes, that's a documentation problem even when the billing is entirely accurate.

When payers push back on 90837

Payers have become increasingly systematic in flagging 90837 billing anomalies. Common triggers for pre-payment review or post-payment audit include:

High ratio of 90837 to 90834. A practice where the vast majority of sessions are billed as 90837—with few or no 90834 or 90832 claims—invites scrutiny. Clinical reality produces variation in session length. Billing patterns that don't reflect that variation look like intentional or coached upcoding to payer algorithms and RAC reviewers, even when individual claims are supported by documentation.

Zero code variation across weeks or months. Providers who bill exclusively 90837, with no other psychotherapy codes in their claim history, often draw review attention regardless of individual note quality. Session length varies in practice. Billing that never varies raises questions about whether documentation is driving code selection or the other way around.

EHR appointment duration that doesn't match the billed code. Many payers cross-reference EHR-reported appointment slot lengths with billed codes. A 45-minute appointment slot billed as 90837 is a red flag. If your scheduling system and your billing system are reporting different session lengths, that discrepancy needs to be resolved—at the documentation level, not the billing level.

Copy-pasted or templated clinical notes. Notes with identical or near-identical content across multiple sessions are a known audit trigger for high-value codes. For 90837 specifically, where each claim carries the highest reimbursement in the code family, payers pay particular attention to whether the documentation appears to be describing real sessions or generic filler in a template.

Common billing mistakes to avoid for CPT 90837

Billing 90837 based on appointment schedule, not actual session time. Scheduling 60-minute appointments does not make every session billable as 90837. If a patient arrived 12 minutes late and the session ran 47 minutes, the correct code is CPT code 90834. The appointment calendar is not clinical documentation.

Missing start and stop times. OIG audits consistently identify inadequate time documentation as the leading cause of improper 90837 billing. "60-minute session" or "1 hour of psychotherapy" does not satisfy the documentation standard. Exact clock times—start, end, and total face-to-face minutes—are required to support this code under payer review.

Billing standalone 90837 when 90838 is required. For psychiatrists providing psychotherapy as part of a combined evaluation and management encounter, the correct code is 90838 as an add-on to the E/M—not a standalone 90837. Billing the standalone code in that context creates a bundling conflict that results in denial of the psychotherapy component. The correct structure is E/M code + 90838, with modifier 25 on the E/M on most commercial plans.

Payer automatic downcodes

It’s also important to be diligent about monitoring reimbursements. Some payers apply a silent downcode, reimbursing 90837 claims at 90834 rates without notification or explanation. Monitoring your ERA (Explanation of Remittance Advice) data for systematic payment reductions on 90837 claims is an essential revenue protection practice. Catching a downcode pattern early can recover significant revenue and drive contract renegotiation.

Documentation best practices

The clinical note supporting a 90837 claim must do more than record a timestamp. It needs to justify 53+ minutes of face-to-face psychotherapy as medically necessary, demonstrate that the session time was used for substantive clinical work, and present the provider's observations in enough detail to be meaningful to a reviewer who wasn't in the room.

A compliant 90837 note includes:

• Exact start and stop times with total face-to-face minutes. "Session conducted 10:12 AM to 11:09 AM (57 minutes face-to-face)" is the minimum standard. This single element is what most audit-failing 90837 notes are missing.
• Active ICD-10 diagnosis. The diagnosis must inform the note—describing why the patient is in treatment and what problems are being addressed, not just appearing as a code in the header.
• Medical necessity narrative. Why does this patient require a 60-minute session rather than a shorter one? Active trauma processing, complex comorbidities, crisis-adjacent presentations, protocol-based treatments like prolonged exposure or EMDR—there are legitimate clinical reasons for extended sessions, and they should be stated. This doesn't need to be lengthy, but it needs to be present.
• Specific therapeutic interventions. Describe what was done in the session with enough precision that the work is distinguishable from another session: "Conducted session 4 of 12-session Prolonged Exposure protocol; completed in-session imaginal exposure and processed affective response to trauma memory."
• Patient engagement and response. Behavioral observations, level of engagement, emotional presentation, safety considerations addressed. A note that describes what the therapist did without describing how the patient responded during the session is incomplete.
• Mental status. Standard expectation in behavioral health documentation; should reflect observations from this specific session.
• Provider credentials and signature. Must match the rendering provider on the submitted claim.

Notes that meet this standard serve two purposes simultaneously: they document quality clinical care and they demonstrate that the billing code is accurate. The goal isn't documentation designed to satisfy a compliance checklist—it's documentation that happens to satisfy one because it accurately describes a real and unique session.

Staying ahead of audits

CPT 90837 has the highest per-claim value among standard individual psychotherapy codes, which means it attracts proportionally greater audit attention. CGS Medicare has specifically flagged this code for documentation review. Recovery audit contractors maintain a six-year lookback period for overpayment findings—meaning 90837 claims from 2020 can still be subject to demand letters in 2026.

Audit risk isn't distributed uniformly. Practices that maintain a realistic distribution of 90832, 90834, and 90837 claims—reflecting real variation in session length across their patient population—face meaningfully lower audit risk than practices whose billing is heavily skewed toward the highest-paying code. If 90% of a practice's psychotherapy claims are 90837, that's not a normal distribution of session lengths, and payers know it.

The good news is that audit risk is manageable. The practices that bill 90837 with confidence are the ones that know their documentation holds up: actual clock times on every note, clinical content that reflects what happened in the session, and a billing distribution that corresponds to real session variability.

How to ensure documentation integrity for CPT code 90837

Given the audit exposure associated with 90837, the most effective risk management strategy is catching documentation problems before claims are submitted—not after a payer requests records or issues a demand letter.

Pre-billing AI chart review can flag 90837 notes that are missing clock times, contain thin or templated medical necessity language, or carry copied content from prior sessions—in real time, before the claim goes out. The math on this is straightforward: a single improper 90837 payment at $167.00 returned under audit is a minor event. A RAC audit identifying a systemic two-year pattern of underdocumented 90837 claims is a major one. Pre-billing review is the intervention that prevents the pattern from developing. 

Request a demo to see how Charta Health applies AI-assisted chart review to high-value behavioral health codes.