90834 vs 90837: Which Psychotherapy Code to Use

90834 vs 90837: the short answer

The 90834 vs 90837 decision is made by the clock. Both codes report individual psychotherapy without an E/M service. 90834 is reported for 38 to 52 minutes of psychotherapy, and 90837 for 53 minutes or more. The descriptor times (45 and 60 minutes) are the midpoints CPT uses, not the minimum you must reach.

Clinical intent, the session length on the schedule and the payer's preferences do not change the code. What the note shows as actual psychotherapy time does. The rest of this article explains how to count that time, where 90832 fits, and how to keep the code mix defensible.

Psychotherapy time ranges for all three codes

CPT's time rule for psychotherapy codes says to choose the code closest to the actual time spent. That produces the following ranges, which most payers, including Medicare, apply.

Code	Descriptor time	Report for	Add-on equivalent with E/M
90832	30 minutes	16–37 minutes	90833
90834	45 minutes	38–52 minutes	90836
90837	60 minutes	53 minutes or more	90838

Psychotherapy of less than 16 minutes is not reported with these codes. Prescribers who also provide an E/M service use the add-on codes in the right-hand column, not 90832, 90834 or 90837.

The 90832 CPT code: short sessions

The 90832 CPT code covers 16 to 37 minutes of psychotherapy. It is used for brief sessions, check-ins that still involve psychotherapy, sessions cut short because the patient arrived late or had to leave, and some school-based or inpatient-adjacent work.

Do not stretch a 35-minute session to 38 minutes to reach 90834, and do not drop a 40-minute session to 90832 to avoid scrutiny. Both are coding errors. Record the time and let it decide.

The 90834 CPT code: the standard session

The 90834 CPT code covers 38 to 52 minutes. Many practices schedule 50-minute sessions, often called the therapy hour, which means a large share of routine outpatient therapy falls here. A 50-minute session is 90834, not 90837.

• Common for weekly maintenance therapy and stable patients.
• Generally not subject to the extra review some payers apply to 90837.
• Uses the same documentation elements as 90837: time, interventions, response and plan.

When 90837 is the right code

90837 applies when psychotherapy reaches 53 minutes. Practices that schedule full-hour sessions for complex cases, trauma processing, or patients early in treatment often bill it legitimately. The note should show both the time and the clinical reason the longer session was needed.

• Severe or complex symptoms that need more time to address safely.
• Evidence-based protocols designed around longer sessions, such as some trauma therapies.
• A session that ran long for documented clinical reasons, such as a disclosure that had to be addressed before the patient left.

For full billing detail, including how to look up payment amounts, see our 90837 CPT code guide.

How to count psychotherapy time

Only time spent providing psychotherapy counts. Getting this right is what makes the code choice defensible.

Counts toward psychotherapy time	Does not count
Face-to-face psychotherapy with the patient	Writing the note after the session
Time with a family member when the patient is present for all or part of the session	Scheduling, billing or insurance calls
Real-time video or audio sessions when the payer covers telehealth	Waiting room time or late arrival time
Psychotherapy portion of a visit that also has a separate E/M (reported with add-ons)	Time spent on the E/M portion of a prescriber visit

Write start and stop times or total minutes in every note. Templates that pre-fill a session length save time but create risk when the actual session ran shorter.

Why payers watch the 90834 and 90837 mix

Several commercial payers and behavioral health organizations compare each clinician's use of 90837 with their peers. Clinicians whose share of 90837 is well above the norm may get outreach letters, record requests or prepayment review. That does not mean 90837 is wrong; it means the notes must support it.

1. Run a monthly report of psychotherapy codes by clinician.
2. Check that the scheduled session length matches the codes billed. A practice with 50-minute slots that bills mostly 90837 will stand out.
3. Sample notes for each clinician and confirm time and medical necessity are documented.
4. Read payer bulletins for policies on 90837 authorization or review.
5. Respond to record requests promptly and completely.

Some plans pay 90837 and 90834 at rates close enough that the extra review risk outweighs the gain for routine sessions. Compare your own fee schedules before setting session-length policies, and never choose a code by rate.

Worked examples: picking the code from the note

These examples show how the documented psychotherapy time, not the appointment slot, decides the code. Each assumes a non-prescribing therapist and no separate E/M service.

Scenario	Psychotherapy time	Code
Patient arrives 20 minutes late for a 50-minute slot	30 minutes	90832
Routine weekly session in a 50-minute slot	48 minutes	90834
Session runs past the hour while addressing a new safety concern	62 minutes	90837
Full-hour slot, but therapy ended early and the clinician wrote notes for the rest	45 minutes	90834
Video session from the patient's home, full protocol completed	55 minutes	90837, with the payer's telehealth POS and modifier
Session with an interpreter, 40 minutes	40 minutes	90834, plus 90785 if the interactive complexity is documented

In the interpreter example, interactive complexity add-on 90785 can be reported with 90832, 90834 or 90837 when a qualifying communication factor is documented. It does not change the time range for the psychotherapy code.

Common coding mistakes and how to fix them

• Billing by appointment length. A 60-minute slot where therapy ran 48 minutes is 90834. Code from the note, not the calendar.
• Counting documentation time. Note-writing after the patient leaves is not psychotherapy time.
• Using standalone codes with an E/M. Prescribers who bill an E/M must use 90833, 90836 or 90838.
• Billing an intake and therapy on the same day. Medicare's NCCI policy does not allow 90791 or 90792 to be separately reported with psychotherapy codes on the same date of service.
• Missing telehealth details. Video sessions need the payer's POS and modifier, plus the patient's location in the note.

Our behavioral health billing guide covers the full set of mental health CPT codes, including crisis, family and group psychotherapy.

Keeping psychotherapy coding consistent

Consistent coding comes from clear templates, accurate time capture and a regular review of the code mix. Fastora's certified coders review psychotherapy claims for time and code alignment as part of our therapist billing work, and a free billing assessment can show how your 90834 and 90837 claims compare with your documentation.

Frequently asked questions