Code 90837 reports individual psychotherapy, 60 minutes — in CPT time logic, any session of 53 minutes or more of psychotherapy with the patient. Its siblings: 90834 (45 minutes — sessions of 38-52 minutes) and 90832 (30 minutes — 16-37 minutes). The threshold that matters daily is 53: a 50-minute "therapy hour" is a 90834, and rounding it up to 90837 is upcoding, while a genuine 55-minute session billed as 90834 quietly donates the difference. For a full-time therapist the gap between the two codes, multiplied across a year of sessions, is thousands of dollars in either direction — which is exactly why both therapists and payers care so much about this one number.
Some plans have historically flagged clinicians whose sessions are overwhelmingly 90837, sending "education" letters or requesting records — the profiling logic being that a mix of patients should produce a mix of session lengths. The letters are not denials, and full-session practice is entirely legitimate — many evidence-based approaches are built on the longer hour. The defense is not coding down in fear; it is documentation that supports the time and the necessity: start/stop times, the interventions used, and, when a payer asks, a straightforward clinical rationale for why this patient benefits from extended sessions. Clinicians who fold to profiling letters by switching everything to 90834 give up real revenue for no compliance gain; clinicians who ignore documentation lose the audits. The correct posture is precise and unapologetic.
These are 2026 national Medicare rates from the CMS fee schedule. Your local rate will be a little higher or lower. Check yours in the Medicare fee lookup.
| Code | Session time | Office (and POS 10) | Facility (and POS 02) |
|---|---|---|---|
| 90832 | 16 to 37 minutes | $85.84 | $69.47 |
| 90834 | 38 to 52 minutes | $113.90 | $91.85 |
| 90837 | 53 minutes or more | $167.00 | $135.27 |
| 90791 | Diagnostic evaluation (intake) | $173.35 | $137.28 |
| 90833 | Add-on with an E/M visit, 16 to 37 minutes | $81.50 | $65.80 |
| 90836 | Add-on with an E/M visit, 38 to 52 minutes | $103.21 | $83.17 |
| 90838 | Add-on with an E/M visit, 53 minutes or more | $136.61 | $110.22 |
Telehealth pays differently by place of service. Medicare pays a session with the patient at home (POS 10) at the office rate. A session with the patient somewhere else (POS 02) is paid at the facility rate. For 90837 that is $167.00 against $135.27.
What rounding down costs. A 55-minute session billed as 90834 instead of 90837 gives up $53.10 at the Medicare office rate. At 20 such sessions a week for 48 weeks, that is about $51,000 a year. Rounding a 50-minute session up to 90837 is the same mistake in the other direction, and it is the one payers audit.
Less than 16 minutes of psychotherapy is not billable as psychotherapy at all.
| Denial | Usual cause | Fix |
|---|---|---|
| CO-50 | No treatment plan or goals in the record | Appeal with the plan and progress notes. |
| CO-197 | No authorization, or the plan's visit limit was reached | Track visits left the way you track deductibles. |
| CO-97 | 90837 billed with an E/M visit on the same day | Rebill as the E/M plus add-on 90838. |
| CO-4 | Telehealth modifier missing or wrong | Add the modifier the payer asks for, such as 95 for video or 93 for audio only. |
Source: CMS Physician Fee Schedule, 2026 RVU file (conversion factor $33.4009).
Here is the moment this page exists for: a payer letter arrives asking for records on ten 90837 sessions. The clinician whose notes carry start/stop times (10:04-11:01), named interventions, session-specific content, and a treatment plan that mentions why extended sessions serve this patient sends the packet and hears nothing more — the review closes. The clinician whose ten notes are near-identical templates reading "60-minute session, discussed stressors, continue plan" faces recoupment on all ten and, worse, lands on the payer's watch list for the next round. Identical clinical work, identical patients, opposite outcomes — decided entirely by five extra minutes of note-writing per session. For a full-time therapist, the arithmetic is stark: those five minutes protect roughly a third of annual revenue, because 90837 IS the revenue. Write the note that survives the letter before the letter comes.
Related: Mental health billing services · POS 10 — telehealth from home · CPT 99214 · CO-50 — medical necessity · All CPT guides
Reviewed by Hassan Raza Awan, Founder — 4+ years of hands-on U.S. medical billing experience. General billing information — verify against current CMS guidance and your payer contracts.
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