Medical Billing

CPT Code 90837: Complete Billing Guide

May 22, 2026

Mental health sessions tend to run longer than most outpatient encounters, and the billing code attached to those sessions matters more than many practices realize. CPT 90837 is the workhorse for extended individual psychotherapy, yet it remains one of the most misunderstood and most frequently audited codes in behavioral health billing.

This guide breaks down what 90837 actually covers, how time is counted, what documentation payers expect, how it differs from related codes like 90834 and 90847, and the common mistakes that quietly drain revenue from busy practices.

What Is CPT Code 90837?

CPT 90837 represents individual psychotherapy with a patient lasting about 60 minutes. The official descriptor reads, “Psychotherapy, 60 minutes with patient.” Despite the round number, the code does not require exactly 60 minutes of face-to-face contact. Under CPT time rules, 90837 can be reported when the clinician spends 53 minutes or more in direct therapeutic interaction with the patient.

Also Read: CPT Code 90832: Time, Billing & Reimbursement Guide

The code is built to capture the therapy itself, including mental status assessment, interactive engagement, therapeutic intervention, and behavioral modification techniques. It does not cover time spent on documentation after the session ends, scheduling, or care coordination that does not involve the patient directly.

Quick Facts at a Glance

Code: 90837
Type: Individual psychotherapy
Time threshold: 53 minutes or more
Settings: Office, outpatient clinic, telehealth, inpatient (with conditions)
Patient presence: Required
Brief participation of a family member as informant: Allowed without changing the code

Who Can Bill CPT 90837?

Eligible billing providers commonly include:

Psychiatrists (MD or DO)
Psychologists (PhD or PsyD)
Licensed Clinical Social Workers (LCSW)
Licensed Professional Counselors (LPC or LMHC)
Licensed Marriage and Family Therapists (LMFT)
Psychiatric Nurse Practitioners
Clinical Nurse Specialists in mental health

The scope of practice varies by state and by payer. Some Medicaid plans and commercial carriers restrict 90837 to specific license types, and Medicare rules around mental health practitioners have shifted in recent plan years. Confirming credentialing rules at the payer level before billing is essential.

Time Range and How to Count Minutes Correctly

This is where most billing errors begin. CPT timed codes follow the rule that a code can be reported when more than half of its typical time has been met.

90832: 16 to 37 minutes
90834: 38 to 52 minutes
90837: 53 minutes or more

There is no strict upper limit on 90837, but sessions extending well beyond 90 minutes may need to be reviewed for prolonged services billing, where the payer allows it. Only direct, face-to-face therapeutic time counts. Greeting the patient, scheduling, note writing, or phone calls before and after the session do not count toward the threshold. Document start and end times clearly in the chart.

Documentation Requirements

Documentation decides whether a 90837 claim is honored or recouped during audit. Payers expect notes to demonstrate that the extended session was clinically necessary, not a default length.

Strong documentation generally includes:

Start and stop times for the session
Presenting symptoms and current mental status
Therapeutic modality used, such as CBT, DBT, EMDR, psychodynamic therapy, or supportive therapy
Specific interventions delivered during the session
Patient response and progress on treatment goals
Updates to the treatment plan
Medical necessity rationale for the longer session length
Diagnosis code (ICD-10) supporting the encounter

A frequent audit trigger is a 90837 note that reads like a 90834. If the documentation does not show why the session needed to run longer than 52 minutes clinically, the reimbursement is exposed.

Modifiers Used With 90837

Modifier 95: Telehealth

When the session is delivered through real-time interactive audio and video telehealth, append modifier 95. Most commercial payers and Medicare moved toward modifier 95 as the standard telehealth identifier for synchronous behavioral health visits. Some payers also expect place of service 10 (patient home) or 02 (other than home), so always check the payer manual.

Modifier GT: Legacy Telehealth

Modifier GT was the original telehealth indicator. Most payers transitioned to modifier 95, but a handful of state Medicaid programs still accept or require GT. The two are not always interchangeable.

Other Commonly Used Modifiers

25: Significant, separately identifiable E/M service on the same day
59: Distinct procedural service, rarely used with psychotherapy
HJ, HO, HE, AH: State Medicaid modifiers indicating provider level

Does 90837 require a modifier by default? No. A standard in-person session billed alone usually needs no modifier. Modifiers apply when there is a special circumstance,e such as telehealth delivery, a same-day E/M visit, or a state Medicaid requirement.

90837 vs 90834: Which One Fits the Visit?

These are the two most confused codes in outpatient mental health.

Feature	90834	90837
Description	Psychotherapy, 45 minutes	Psychotherapy, 60 minutes
Time range	38 to 52 minutes	53 minutes or more
Typical use	Standard outpatient session	Extended session for complex care
Reimbursement	Lower	Higher, often 30 to 40 percent more
Audit risk	Lower	Higher, especially when used routinely
Documentation effort	Standard	Must justify the extended duration

Manclinicians default to 90837 because their sessions naturally run close to an hour. That is understandable, but if the actual face-to-face time is below 53 minutes, 90834 is the correct selection. Routinely billing 90837 for sessions that fall short is one of the most common causes of overpayment recovery in behavioral health.

90837 vs 90847: Individual Versus Family Therapy

Feature	90837	90847
Type of session	Individual	Family or couples therapy with the patient present
Identified patient	Yes	Yes, required
Other participants	Patient only (informant allowed briefly)	Spouse, parent, or family member
Time benchmark	53 minutes or more	About 50 minutes is typical, no minute floor in CPT
Therapeutic focus	The patient’s own mental health	Relationship dynamics impacting the patient

If a spouse joins late in a session only as an informant or support figure, 90837 can still be appropriate. If the actual clinical work centers on the relationship or family system, 90847 fits better.

Reimbursement Considerations

Reimbursement rates vary by payer, geography, and contract terms. Medicare’s national average for 90837 generally falls in the range of about $145 to $160, with geographic adjustments through the GPCI moving that figure higher or lower. Commercial plans tend to pay 1.2 to 1.6 times the Medicare allowable. Medicaid rates in many states fall below Medicare.

Also Read: CPT Code 99204: Billing Guidelines and Best Practices

Several factors shape the final paid amount:

Provider type and credentialing level
In-network versus out-of-network status
Geographic locality
Place of service code accuracy
Modifier accuracy
Patient cost share, including deductibles, copays, and coinsurance

At Zee Medical Billing LLC, the patterns we see most often in 90837 denials cluster around three areas: missing time documentation, weak medical necessity language, and incorrect place of service or modifier combinations for telehealth. Tightening those three areas tends to recover more revenue than chasing rate increases.

Common Pitfalls and How to Avoid Them

Billing 90837 for every session, regardless of actual time spent
Skipping start and stop times in the clinical note
Documenting interventions without linking them to medical necessity
Using modifier GT when the payer expects modifier 95
Mismatched diagnosis codes that do not support 60-minute care
Failing to verify benefits when patients switch plans mid-year
Confusing 90837 with prescriber psychotherapy add-ons such as 90838

A regular internal review of how often each clinician bills 90837 compared with 90834 helps practices catch issues before payers do.

FAQs

What does CPT code 90837 actually mean?

It is the code therapists use to bill an individual psychotherapy session lasting about an hour. The official rule is 53 minutes or more of direct, face-to-face therapeutic contact with the patient. Documentation, scheduling, and post-session work are not part of that time. The code is meant to reflect a substantive, clinically focused therapy session rather than a brief check-in.

Is 90837 considered a high audit risk?

Yes. Payers have flagged 90837 utilization patterns for years because the code is often overused. When a provider bills 90837 at a noticeably higher rate than peers in the same specialty, audit requests can follow. Detailed notes with timing, interventions, and medical necessity language protect the claim. Practices that internally audit their own coding mix tend to avoid surprise recoupments.

Can 90837 be billed for telehealth sessions?

Yes. It is one of the most common telehealth codes in behavioral health. Most payers expect modifier 95 along with the right place of service, typically 10 for the patient’s home or 02 for another non-facility location. A few state Medicaid programs still ask for modifier GT, so check each payer’s current policy. Coverage rules continue to evolve, especially around audio-only sessions.

What is the practical difference between 90837 and 90834?

Time is the dividing line. If the therapeutic contact lasts 38 to 52 minutes, 90834 is the correct code. If it lasts 53 minutes or more, 90837 applies. Many practices schedule a 50-minute therapy hour, which places them very close to the threshold and is often the source of audit pressure. Choosing the right code per visit, rather than defaulting to one, keeps billing defensible.

Does Medicare cover CPT 90837?

Yes, when the service is provided by an eligible practitioner and supported by an appropriate diagnosis. Payment depends on the current Medicare physician fee schedule and locality adjustments. Coverage extends to telehealth sessions when payer rules are followed. Annual updates can change which practitioners are covered and how originating site or audio-only rules are applied, so reviewing the latest fee schedule each year is good practice.

Conclusion

CPT 90837 is straightforward in concept but unforgiving in execution. The code is correct only when the session genuinely meets the 53-minute threshold, the documentation reflects extended clinical work, and the modifiers and place of service align with how the visit was delivered. Practices that build a habit of time-stamped notes, clear medical necessity language, and clean modifier use tend to see steady reimbursement and far fewer take-backs.

Key points to carry forward: