CPT Quick-Reference Guide for Behavioral Health Billing

UPDATED ON: Mar 30,2026

Your billing team asks. Your clinicians ask. “Which code goes on this session?” This guide is the answer you can print, bookmark, and share.

Behavioral health billing has more failure points than most medical specialties. Time-based codes, add-on rules, modifier requirements, and telehealth distinctions all create denial risk when any piece is wrong. Below is everything you need in one place: individual therapy time bands, diagnostic evaluation codes, prescriber visit combos, group therapy, the interactive complexity add-on, telehealth codes, modifiers, and the errors that most often trigger recoupment demands.

Individual Psychotherapy Time Bands: 90832, 90834, and 90837

The three core psychotherapy billing codes are time-based. Bill to the actual session length. Not the intended length. Not the default length in your scheduler. The documented length.

CPT Code	Time Band	Typical Use	Documentation Requirement
90832	16-37 minutes	Brief check-ins, medication follow-up with short therapy component	Record start and end times
90834	38-52 minutes	Standard outpatient session (the most common outpatient code)	Record start and end times
90837	53+ minutes	Full-hour sessions with documented extended time	Record start and end times; document reason if significantly beyond 60 min

The 53-minute floor for 90837 comes from the CPT midpoint rule: halfway between 52 (the max for 90834) and 60 (the standard benchmark hour).¹

The single most audited upcoding pattern in behavioral health: billing 90837 for 50-minute sessions. Payer AI systems flag practices where notes consistently show 50-minute sessions but every claim is 90837.² If your documentation says 50 minutes, the correct code is 90834. Every time.

“Approximately 45 minutes” won’t survive an audit. Document exact start and end times on every note.

Diagnostic Evaluation Codes: 90791 vs. 90792

Two codes. One critical distinction: prescriber credentials.

CPT Code	Who Bills It	What’s Included	Common Error
90791	Therapists, LCSWs, LPCs, psychologists	Diagnostic evaluation without medical services	Billing for ongoing sessions (this is an intake/evaluation code)
90792	Psychiatrists, psychiatric NPs, clinical psychologists	Diagnostic evaluation with medical services included	Non-prescribers billing this code

Payers check provider taxonomy against the code automatically. An LCSW billing 90792 gets an automatic denial. These are not ongoing session codes, either. Billing 90791 every month is a red flag that triggers review.

When billing 90792, the documentation must reflect the medical services component: a medication review, symptom assessment, or a prescribing decision. “Evaluation completed” won’t hold up.

When Your Prescriber Also Does Therapy: E/M Add-On Codes

When a psychiatrist or psychiatric NP provides both medication management and psychotherapy in the same visit, two codes apply: an Evaluation and Management (E/M) code for the medical portion, and an add-on psychotherapy code for the therapy portion.

Add-On Code	Psychotherapy Time	Companion E/M Code	Modifier Required on E/M
90833	16-37 minutes	99212-99215	Modifier 25
90836	38-52 minutes	99212-99215	Modifier 25
90838	53+ minutes	99212-99215	Modifier 25

Modifier 25 on the E/M code is not optional. Without it, the payer reads the E/M and the add-on as duplicate services for the same visit and denies one.³ This is the most frequently missed modifier when billing this combination.

Time is also separate. Time spent on medication management does not count toward psychotherapy time. Both must be documented independently. “20 minutes medication review, 30 minutes cognitive behavioral therapy” is what auditors need to see. “55 minutes combined” is not sufficient.

A psychiatrist in Charlotte sees an established patient for 30 minutes of medication management and 25 minutes of CBT. Correct claim: 99213-25 + 90833. Skip the modifier 25, and the 90833 denies as a duplicate.

High-level E/M codes (99214, 99215) paired with add-on psychotherapy require sufficient combined time documentation. Payers scrutinize this combination closely.³

Group Therapy (90853) and the Interactive Complexity Add-On (90785)

Group Therapy: 90853

90853 is billed per patient, per session. Eight patients in a group means eight 90853 claims. Not one claim for the group.

CPT Code	Session Parameters	Who Bills	Key Rule
90853	Typically 45-60 minutes; Medicare guidelines suggest 10 or fewer participants<sup>4</sup>	The rendering therapist, per patient	Bill individually for each participating patient

Interactive Complexity Add-On: 90785

90785 is an add-on code for when communication is significantly more difficult during a psychiatric service. It can accompany individual therapy (90832, 90834, 90837) or group therapy (90853).

The four qualifying conditions:⁵

1. Maladaptive communication: High anxiety, repeated questions, or disagreement that disrupts delivery of care

2. Communication barriers: The patient cannot use typical language for communication

3. Required third-party presence: A guardian, interpreter, or legally authorized representative must participate for proper assessment or treatment

4. Safety disclosure: Evidence or disclosure of a safety issue requiring changes to the treatment plan

The per-patient rule: 90785 is billed only for patients who meet one of the four criteria. If two out of eight group members qualify, two 90785 add-ons go out. Not eight. The specific qualifying criterion must be documented in that patient’s record. “Interactive complexity present” is not sufficient documentation.

A billing manager at a 35-clinician behavioral health agency in Columbus found their 90785 denials spiked after billing the add-on for every group participant. The fix was per-patient documentation of the specific qualifying condition. Denials dropped.

Telehealth Billing: Codes, Modifiers, and Place of Service

Missing a single modifier or using the wrong place of service code results in 100% denial until corrected.⁶ Get these right before submission.

Telehealth Modifiers

Modifier	Meaning	When Required
95	Synchronous audio-video telehealth	Required by most commercial payers and Medicare
GT	Medicare-specific telehealth indicator	Some Medicare Administrative Contractors require GT instead of 95; check your MAC

Audio-only update (effective January 31, 2026): Audio-only behavioral health revenue cycle management services are now permanently reimbursable under Medicare when the patient cannot or will not use video technology.⁷ Document why video was not used. This is not optional documentation.

Place of Service Codes

POS Code	When to Use
POS 02	Patient received telehealth care; NOT in their home (clinic, facility, community setting)
POS 10	Patient received telehealth care from their home

Q3014: The Originating Site Fee

Q3014 is the Medicare telehealth originating site facility fee. Bill it when the patient is physically at a healthcare facility receiving telehealth from a remote provider.

2026 Medicare rate: $31.85 (increased from $31.01 in 2025, reflecting the 2.7% Medicare Economic Index increase)⁷
Billed by the facility, not the rendering provider
Billed separately from the service code
Many agencies never bill this. It’s a legitimate fee that adds up across a large practice.

A patient at a community health center in Albuquerque connects via video with their psychiatrist at a different location. The facility bills Q3014. The psychiatrist bills the E/M code with modifier 95 and POS 02. Two separate claims. Both correct.

License-Level Modifiers (State Medicaid)

Modifier	Meaning	When Required
HO	Master’s level provider	Required by many state Medicaid programs for behavioral health billing software claims
HN	Bachelor’s level provider	Required by some state Medicaid programs

Modifier requirements vary by state Medicaid program and are updated frequently. Check your state’s provider manual before submitting.⁶

Common Billing Errors in Behavioral Health

These are the patterns that trigger denials, audits, and recoupment demands most often.

Upcoding 90837 for sessions under 53 minutes. Document actual start and end times. Bill to the time band the note supports.
Missing modifier 25 on E/M when billing with add-on psychotherapy. Modifier 25 is required on the E/M code whenever 90833, 90836, or 90838 appears on the same claim for an established patient.
Billing 90785 for all group patients without per-patient documentation. Document the specific qualifying criterion for each individual patient who receives the add-on.
Wrong POS code for telehealth. POS 02 for patient at a facility, POS 10 for patient at home. These are not interchangeable.
Forgetting Q3014 when the patient is at a facility for telehealth. Add Q3014 to the facility’s claim. It’s a separate, billable originating site fee.
Non-prescribers billing 90792 instead of 90791. 90792 requires prescriber credentials. LCSWs and LPCs bill 90791.
Billing 90833/90836/90838 without separating E/M time from therapy time in documentation. Both time components must be documented explicitly and independently in every record.
Missing or wrong telehealth modifier. Verify payer requirements before every submission. Medicare, commercial payers, and state Medicaid programs each have their own rules.

A Reference Worth Keeping

Behavioral health billing has more moving parts than most specialties. Time bands, add-on rules, modifier combinations, and telehealth distinctions all create common documentation barriers for behavioral health claims when any one piece is wrong.

Print this guide. Share it with your billing team. The right code comes from the right documentation, and the right documentation starts in your EHR.

PIMSY is built specifically for behavioral health workflows, connecting clinical notes directly to claims so the documentation that supports each code is captured at the point of care. If you want to see how that works in practice, a 30-minute demo will show you.

Schedule a demo with PIMSY