You ran a full hour with a client. The work was good. And yet clicking 90837 on the claim still makes you hesitate, because you’ve heard the word “audit” enough times to feel it in your shoulders. That hesitation costs money, and it’s usually built on a misunderstanding of what the code actually requires.
Here’s the reassuring part: 90837 is not a complicated code. The rules are specific, the time threshold is a single number, and the documentation that protects you fits in one line of your note. Let’s walk through what 90837 covers, the exact time requirement, what your note needs, when to use it instead of 90834, and the denial reasons worth knowing before you submit.
What the 90837 CPT Code Covers
The 90837 CPT code is individual psychotherapy at the longest standard session length. The AMA defines it plainly: “Psychotherapy, 60 minutes with patient.”1 Some payers and vendors call it the 60 minute psychotherapy code, and that shorthand is fine as long as you don’t read “60 minutes” as a rigid stopwatch requirement.
This is face-to-face individual psychotherapy. The time that counts is the therapy you actually deliver with the client present. Scheduling, no-show waiting, and the note you write afterward don’t count toward it.
It sits at the top of the individual psychotherapy family: 90832 for the shortest sessions, 90834 in the middle, and 90837 for the longest. Picking correctly among the three comes down to one thing, which is time.
Think about a solo LCSW who runs standing 55 to 60 minute sessions all week. If she’s billing 90834 out of habit or caution, she’s coding the wrong service and leaving earned reimbursement on the table. The right code for that session is 90837.
90837 Time Requirements: the 53-Minute Rule
The single fact that clears up most confusion here is that the billing floor is 53 minutes, not 60. Per CPT, confirmed in the APA’s psychotherapy coding guidance, the individual psychotherapy time ranges are:2
- 90832: 16 to 37 minutes
- 90834: 38 to 52 minutes
- 90837: 53 minutes or longer
There’s also a floor for the whole family: psychotherapy codes should not be billed for any session lasting less than 16 minutes.2
So the working rule is simple. Once you cross 53 minutes of therapy time with the client, 90837 is the correct code. You do not need a literal 60 minutes on the clock. A session that ends at 54 minutes qualifies.
Count only the face-to-face therapy time. Time the client wasn’t present and the paperwork you finish afterward stay out of the tally. The most common errors run in both directions: rounding a 48-minute session up to 90837, and under-coding a genuine 56-minute session as 90834 to avoid attention. Neither matches the record, and both create risk.
90837 Documentation Requirements
Your note has to support the time you billed. That’s the whole game with 90837 documentation requirements. The APA’s guidance is direct: note start and stop times for every psychotherapy session, because from an insurance standpoint, if you didn’t record it, you didn’t deliver it.2
Beyond the clock, a defensible note also captures the interventions you used, how the client responded, and the medical necessity that ties the session to the diagnosis and treatment plan. Time proves duration. The clinical content proves the service was warranted.
This is where the documentation workflow earns its keep. PIMSY captures session start and stop times and total length inside the note itself, so the minutes in your record match the minutes on the claim. When a payer requests records, that alignment is what turns a scary letter into a five-minute reply.
Picture a group practice that gets a payer records request on a batch of these claims. If every note already carries start and stop times, the request is an inconvenience. Without them, it’s a clawback waiting to happen. Good mental health documentation software makes the first outcome the default.
90837 vs 90834: Picking the Right Code
The 90837 vs 90834 decision looks harder than it is. 90834 covers 38 to 52 minutes, the session most people call “45 minutes.” 90837 covers 53 minutes and up, the “60-minute” session. The dividing line between them is 53 minutes, full stop.
Two traps sit on either side of that line. The first is defaulting to 90834 to stay invisible, even when your sessions genuinely run long. Steady under-coding quietly drains a practice’s revenue, one session at a time. The second is stretching a 45 to 50 minute session up to the longer code, which is exactly the pattern payers look for.
The clean answer is to bill the code that matches both the clock and the note. Two clinicians who each ran a 50-minute session should both land on 90834. A clinician who ran 58 minutes should bill 90837 without flinching. Match the service, document the time, move on.
Why 90837 Claims Get Denied, and How to Prevent It
This code draws more scrutiny than its shorter cousins, and it helps to know why. It reimburses more per session than 90834 under the Medicare Physician Fee Schedule, which is a big reason payers watch it closely.3 That gap is also why walking away from the code out of fear is the wrong move.
The 90837 denial reasons that show up most often are worth memorizing:
- Missing or inconsistent time documentation, the top preventable cause
- A diagnosis that doesn’t support medical necessity for an extended session
- Frequency flags, since payers treat heavy use of this extended session as an audit trigger
- Payer-specific frequency limits or prior authorization you didn’t clear; these limits vary by payer2
Notice that the fix for nearly all of these is documentation and code-to-claim consistency, not avoiding the code. Before a claim goes out, four checks handle most of the risk: the time is recorded, the diagnosis supports medical necessity, the treatment plan is current, and the code matches the session length. PIMSY keeps the code, the note, and the claim aligned so a mismatch surfaces in your workflow instead of in a denial letter weeks later. If you want to go deeper on the paperwork side, our guide to common documentation barriers on behavioral health claims covers the patterns that trip up more than just 90837.
Bill 90837 with Confidence
Strip away the audit anxiety and it comes down to two things. It’s a 53-minutes-or-longer code, and a note with start and stop times is what protects the claim. The code was never the risk. Sloppy documentation is.
Get those two habits right and individual psychotherapy billing stops being a source of stress and starts being predictable. That’s the point of an EHR built for behavioral health rather than borrowed from primary care.
Want to see how PIMSY captures session time and keeps your 90837 claims clean from note to submission? Book a demo and we’ll walk you through it.
Sources
1 American Medical Association, CPT Evaluation and Management and psychotherapy code descriptors
2 American Psychological Association Services, Psychotherapy Services Frequently Asked Questions
3 Centers for Medicare & Medicaid Services, Physician Fee Schedule Look-Up Tool
