CPT 90834
Psychotherapy, 45 Minutes
How it is billed
- The 45-minute code is met by any session from 38 to 52 minutes of psychotherapy time — the ranges are contiguous, so every session length maps to exactly one code
- Below 38 minutes the 30-minute code applies; at 53 minutes and above the 60-minute code does
- Psychotherapy time is the therapy itself; time spent on separately reportable services or on administrative work is not counted toward the range
- Where a prescriber provides an evaluation and management service and psychotherapy in the same encounter, the psychotherapy add-on codes apply rather than the standalone ones
- Telehealth delivery uses the same code with the telehealth modifier and the place of service the payer specifies, and the time ranges do not change
What the record must show
- The session's start and stop times, or its duration, must be recorded — the code is defined by an interval, so a note without one cannot support the code that was billed
- The therapeutic content should show what was done: the modality, the focus, the response and the plan, rather than a generic statement that supportive therapy was provided
- Where sessions consistently land at exactly the same duration across an entire caseload, the pattern rather than any individual note is what attracts review
A worked example
A patient attends a weekly session running from 10:02 to 10:49 — 47 minutes of psychotherapy. That falls inside 38 to 52 minutes, so 90834 is correct and the recorded times prove it.
The next session runs 10:00 to 10:56. At 56 minutes it is the 60-minute code, not 90834, and reporting 90834 out of habit undercharges for work actually performed.
A third session is cut short at 34 minutes when the patient leaves early. That is the 30-minute code — not 90834 with an explanation, and not a full-length code because the appointment was scheduled for one. The clock, recorded contemporaneously, decides all three.
What decides payment
The contiguous ranges exist because a rule keyed to exact durations would be unworkable in a clinical setting. What they produce in practice is a boundary at 53 minutes with meaningfully different payment either side, which is why payers profile the ratio between the two codes across a provider's caseload.
That profiling is a screening tool and not a finding. A practice whose model is 60-minute sessions will legitimately report the longer code almost exclusively, and the defence is scheduling records and contemporaneous times rather than a distribution that matches an average.
Behavioural health carve-outs complicate everything upstream of the code. Where a plan delegates behavioural health to a separate administrator, eligibility, authorisation and the claims address all differ from the medical benefit, and a correctly coded claim sent to the wrong administrator still fails.
Denials this code attracts
Modifiers that apply
Codes billed alongside or confused with this one
Billed most in — Mental & Behavioral Health · Pediatrics · Internal Medicine
Terms used here — Medical Necessity · Prior Authorization · CPT Code · Denial
How we handle it — Medical Coding · Prior Authorization · Claims Management
Primary sources
What the code-set maintainers and payers actually publish about billing 90834.
- Medicare Benefit Policy Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — What Medicare covers and under what conditions, as distinct from how a claim is processed. The starting point for any coverage or medical necessity question.
- Medicare Coverage Database (LCD/NCD) (opens in a new tab)
Centers for Medicare & Medicaid Services — Searchable national and local coverage determinations. The direct answer to whether a diagnosis supports medical necessity for a given procedure.
- CPT code set (opens in a new tab)
American Medical Association — Maintainer of CPT. Annual changes to CPT are the most common cause of a sudden, unexplained rise in denials each January.
Questions about CPT 90834
Individual psychotherapy of approximately 45 minutes with the patient, satisfied by any session lasting 38 to 52 minutes. It is the most commonly reported outpatient psychotherapy code.
38 to 52 minutes of psychotherapy. Below 38 minutes the 30-minute code applies; at 53 minutes and above the 60-minute code does. The ranges are contiguous, so every session maps to exactly one code.
Duration alone. 90834 covers 38 to 52 minutes and 90837 covers 53 minutes and beyond. Because payment differs meaningfully at that boundary, payers profile the ratio between the two across a provider's caseload.
No. Anything from 38 minutes qualifies. A session ending below 38 minutes takes the 30-minute code instead — the scheduled length is irrelevant, and the contemporaneously recorded duration is what supports the claim.
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