Guide

90837 under the microscope: billing hour-long therapy defensibly

Summary

Billing 90837 for most or all sessions doesn't trigger an automatic review by itself — CPT allows it whenever the documented time supports it. What draws a payer's attention is a pattern with no variation at all, paired with notes that don't clearly show the minutes billed. The defense isn't switching codes; it's a record where every 90837 claim carries a time entry and a medical-necessity note that actually backs the hour.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

Does the code itself trigger anything?

No single claim line triggers a review — CPT permits reporting 90837 for every session where the documented time is 53 minutes or more, and nothing in the code's definition caps how often a clinician can use it 1Ref 1APA Services, Inc. (2025).Psychotherapy Codes for Psychologists.Establishes that 90837 applies to any session of 53 minutes or more with no cap on frequency of use.. A reviewer isn't reading one claim; utilization patterns get compared across a clinician's whole caseload over time.

What payers and Medicare administrative contractors actually watch for is a billing pattern that sits well outside how the rest of a clinician's peer group codes the same service — a profile with almost no variation across hundreds of claims reads differently than the same code used because it's usually the right one. That comparison is a common review trigger across claims analytics generally, not a formal rule tied to any single percentage.

What "under review" actually means

A review can be as light as a request for a handful of chart notes or as heavy as prepayment review, where a payer holds claims until documentation clears before paying them. Both usually start the same way: a letter naming specific dates of service and a deadline to respond.

Your network's own portal is often where that policy actually lives rather than leaving providers to guess — Optum's Provider Express, for one payer's behavioral health panel, publishes its own records-request and review process for the clinicians it credentials 2Ref 2Optum Behavioral Health (2026).Provider Express.Cited as one payer's own published portal where records-request and review process is documented, not as a claim about all payers.. Getting stuck in prepayment review is the harder version of this problem, with its own recovery path once it happens — worth reading before it does, not after. Most records requests resolve at the lighter end: a payer asks for the notes behind a sample of claims, a biller-of-one pulls them, and the review closes without further action.

What a reviewer actually looks for in the note

Medicare and most commercial reviewers check for the same basics: a time entry consistent with the code billed, a diagnosis that supports ongoing treatment, and a signature authenticating the entry. Missing any one of the three is a documentation gap even when the clinical care itself was appropriate.

Medicare requires that services be authenticated by a handwritten or electronic signature, and if a signature is missing when a review happens, an attestation statement can cure it — but only through the specific process CMS recognizes, not a note added to the chart after the request arrives 3Ref 3Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.Supports the signature-authentication requirement and how attestation cures a missing signature within CMS's recognized process during review.. A signed, time-stamped entry closes the most common gap in a records request before it becomes one. The habit that keeps this simple: sign each note the day it's written, and use a consistent format for stating session time so a reviewer doesn't have to interpret abbreviations or infer duration from surrounding text.

Coverage eligibility sits underneath the code

Which provider types can bill psychotherapy codes to a given payer matters as much as the code itself. Medicare recognizes psychiatrists, psychologists, and clinical social workers as long-standing eligible billers, and since 2024 has added marriage and family therapists and mental health counselors to that list 4Ref 4Centers for Medicare & Medicaid Services (2025).Medicare and Mental Health Coverage.Supports which provider types Medicare recognizes for psychotherapy billing, including the 2024 addition of MFTs and mental health counselors..

A denial that looks like a coding challenge is sometimes an enrollment gap instead — a provider type the payer hasn't finished recognizing, or a credentialing file that lapsed without the biller-of-one noticing. Before treating a records request as a signal to change coding behavior, confirm the simpler explanation isn't the real one.

What a reviewer can and can't ask for

A records request reaches the general clinical record — diagnosis, treatment plan, and progress notes — because that's the file a payer's review authority extends to. It doesn't reach the separately protected file OCR calls psychotherapy notes, which stays outside a typical claims review even when the same clinician wrote both 5Ref 5HHS Office for Civil Rights (2026).Does HIPAA provide extra protections for mental health information compared with other health information?.Supports that a claims review reaches the general clinical record but not the separately protected psychotherapy notes file..

Keeping that separation clean does double duty: it protects the clinician's private clinical reasoning and it narrows what a review can actually request. A chart where every session note doubles as the only record — with no separately kept psychotherapy notes — hands over everything by default, whether or not a reviewer was entitled to all of it.

Building the pattern that survives a look

The clinician who bills 90837 for nearly every session and never hears from a payer is usually the one whose notes would already answer the request before it's sent — time documented, necessity stated, signature current. That's a habit built session by session, not a response drafted after a letter arrives.

The same discipline extends to the rest of the psychotherapy family — re-billing 90791 outside its expected cadence, teletherapy claims delivered without the right modifier, or group sessions billed without individualized notes all draw the same kind of look 90837 does. None of them are wrong codes to use; all of them need a record that shows the work matched the claim.

Common questions

Not automatically. CPT permits 90837 whenever the documented session time is 53 minutes or more, with no cap on how often it's used. What draws a closer look is a billing pattern with no variation at all, especially when paired with notes that don't clearly show the time behind each claim. The fix is documentation discipline, not switching codes you don't need to switch.

A records request usually asks for a sample of chart notes behind specific claims and closes once you respond. Prepayment review is heavier — the payer holds new claims until documentation clears before paying them, turning every future claim into a small review of its own. Both start with a letter naming dates of service and a deadline.

No — 90837 doesn't require a special consent or authorization distinct from the general consent to treatment already on file. What it requires is a note showing the session actually ran 53 minutes or more and that the extended time served the treatment plan, not a signed form specific to the code.

No. A typical claims review reaches the general clinical record — diagnosis, treatment plan, and progress notes — not the separately protected file HIPAA calls psychotherapy notes, when that file is genuinely kept apart. Mixing the two into one note by habit removes that protection, since there's no separate file left to withhold.

No — the CPT time band is based on the clock, not on subjective impression. A session that objectively ran 53 minutes or more qualifies for 90837 regardless of how quickly or slowly it felt to either party. What would be a problem is documenting a duration that didn't actually occur, which is a fabrication issue, not a judgment-call issue.

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References

1.APA Services, Inc. (2025). Psychotherapy Codes for Psychologists. APA Services, Inc.. link ✓Establishes that 90837 applies to any session of 53 minutes or more with no cap on frequency of use.
2.Optum Behavioral Health (2026). Provider Express. Optum Behavioral Health. linkCited as one payer's own published portal where records-request and review process is documented, not as a claim about all payers.
3.Centers for Medicare & Medicaid Services (2023). Complying with Medicare Signature Requirements. CMS Medicare Learning Network (MLN905364). link ✓Supports the signature-authentication requirement and how attestation cures a missing signature within CMS's recognized process during review.
4.Centers for Medicare & Medicaid Services (2025). Medicare and Mental Health Coverage. CMS Medicare Learning Network (MLN1986542). link ✓Supports which provider types Medicare recognizes for psychotherapy billing, including the 2024 addition of MFTs and mental health counselors.
5.HHS Office for Civil Rights (2026). Does HIPAA provide extra protections for mental health information compared with other health information?. U.S. Department of Health and Human Services. linkSupports that a claims review reaches the general clinical record but not the separately protected psychotherapy notes file.

https://www.gale.care/for-providers/bhc-90837-scrutiny · 5 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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