Core Outpatient Psychotherapy Codes & Time Ranges
Under American Medical Association (AMA) CPT guidelines, psychotherapy codes are time-based. Billed codes must reflect exact continuous face-to-face duration, following the CPT midpoint rule.
| CPT Code | Nominal Time | Billable Threshold | Clinical Application |
|---|---|---|---|
| 90791 | 60–90 mins | Untimed / per encounter | Initial clinical intake, diagnostic assessment, history, mental status exam, and initial treatment plan. Typically limited to once per episode of care or annually. |
| 90832 | 30 mins | 16–37 minutes | Brief individual therapy, crisis de-escalation, or check-in session. Commonly billed with medical E/M by prescribers. |
| 90834 | 45 mins | 38–52 minutes | The industry standard psychotherapy session code. Adjudicated without prior authorization by the vast majority of commercial plans. |
| 90837 | 60 mins | 53+ minutes | Extended intensive individual psychotherapy. Requires clear medical necessity in clinical notes (e.g. trauma protocols, EMDR, severe crisis). Heavily audited. |
| 90846 | 50 mins | 26+ minutes | Family therapy session conducted without the identified patient present (e.g. parent guidance, collateral session). Payer coverage varies. |
| 90847 | 50 mins | 26+ minutes | Couples or family psychotherapy session with the identified patient present. Must focus on treating the identified patient's diagnosis. |
The 90837 vs 90834 Audit Risk: Why 60 Minutes Triggers Reviews
CPT 90837 reimburses roughly 25%–35% higher than 90834 across commercial fee schedules. Because of this differential, commercial payers (specifically Aetna, Optum/UHC, and Anthem) employ automated statistical profiling algorithms to detect outlier practices.
If your practice submits more than 70% of individual therapy claims under code 90837, you risk being placed on prepayment record review. Under prepayment review, the payer withholds claim payments until your clinical notes are manually reviewed by an auditor to prove:
Exact Start & Stop Times
Auditors reject notes stating "60 minutes" without exact timestamps (e.g. "Session began at 10:02 AM and concluded at 10:58 AM — 56 face-to-face minutes").
Clinical Justification for Extended Time
Notes must substantiate why the patient required more than a standard 45-minute session (e.g. prolonged exposure therapy, EMDR desensitization, severe decompensation).
Prior Authorization Check Required
Diagnostic Evaluation: 90791 Rules & Frequency Limits
CPT 90791 is an untimed code representing an intake assessment. While it does not require exact start/stop minutes, commercial payers enforce strict clinical documentation standards:
- Frequency Limits: Commercial payers typically permit only one 90791 per patient per 12-month period, or one per new episode of care. If a client returns after a brief absence, payers require standard therapy codes unless a substantial change in diagnostic status occurred.
- Required Note Components: Chief complaint, history of present illness (HPI), mental status exam (MSE), risk assessment (suicidality/homicidality), formal DSM-5 diagnosis with ICD-10 code, and an individualized treatment plan with measurable goals.
- Bundling Rules: You cannot bill psychotherapy (90834 or 90837) on the same date of service as 90791.
Telehealth Behavioral Health Billing: POS and Modifiers
Telehealth reimbursement for mental health therapy remains strong under state parity laws, but claims are routinely rejected if Place of Service (POS) and modifiers mismatch:
Applies when the client is physically located at their private residence during the remote audio-video session.
Used when the patient is located in a healthcare facility, office, or site other than their personal home.
Append to 90834 or 90837 to indicate real-time interactive audio and video telecommunication (e.g. 90834-95).
Pre-Submission Clean Claim Checklist
- Verify active commercial coverage and deductible remaining before session 1.
- Document exact start and stop face-to-face times on every psychotherapy note.
- Substantiate clinical medical necessity for 90837 encounters exceeding 53 minutes.
- Match telehealth POS (02 or 10) with the appropriate modifier (95) based on payer rules.
Frequently Asked Questions about Behavioral Health CPT Codes
Frequently asked questions
What is the minimum face-to-face time required to bill 90837?
Under CPT time rules, 90837 covers 60 minutes of individual psychotherapy. According to the CPT 'time rule,' you must document at least 53 minutes of continuous, face-to-face psychotherapy. If the session lasts between 38 and 52 minutes, you must bill 90834 instead.
Why do commercial payers audit practices that bill 90837 frequently?
Commercial payers compare individual clinician billing patterns against regional specialty averages. Across commercial claims, 90834 accounts for roughly 65% of outpatient psychotherapy, while 90837 accounts for ~30%. When a provider bills 90837 for 75% or more of their total encounters, automated outlier algorithms flag the practice for prepayment documentation reviews or retrospective audits.
Can a therapist bill 90791 and 90837 on the same date of service?
No. CPT code 90791 represents a comprehensive diagnostic evaluation, which inherently includes clinical assessment and diagnostic formulation. Commercial payers consider same-day individual psychotherapy bundled into the initial evaluation and will reject or deny 90837.
What is the difference between Place of Service (POS) 02 and POS 10 for telehealth?
POS 10 indicates telehealth provided in the patient's home (introduced post-PHE). POS 02 indicates telehealth provided in a location other than the patient's home (e.g. an outpatient clinic, workplace, or community site). Check each payer's specific billing guidelines, as some commercial payers still require POS 02 for all remote encounters.
When can psychiatrists bill add-on code +90833?
+90833 represents 30 minutes of individual psychotherapy (16–37 minutes) performed by an eligible prescriber (psychiatrist, PMHNP, or PA) in conjunction with an Evaluation and Management (E/M) service (such as 99213 or 99214). The psychotherapy time must be documented separately from the E/M medical decision-making time.
A verification reflects what the payer had on file at the time of the check. It is not a guarantee of payment. Coverage can change mid-year, and retroactive terminations happen. Keep your reference number.