The Definitive GT Modifier Telehealth Billing Guide for Behavioral Health Practitioners (2026)

If you're billing telehealth services as a therapist, psychiatrist, LCSW, LPC, or LMFT, the GT modifier is one of the most important two-character codes in your billing toolkit — and also one of the most misunderstood. Bill it incorrectly (or forget it entirely), and you're looking at claim denials, delayed payments, and in worst-case scenarios, compliance exposure.

This guide breaks down everything you need to know about the GT modifier in 2026: what it means, when to use it, which payers require it, how it interacts with other modifiers, and how to build a bulletproof documentation workflow that keeps you audit-ready at all times.

Let's get into it.

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What Is the GT Modifier?

The GT modifier — defined as "via interactive audio and video telecommunication systems" — is a HCPCS Level II modifier appended to a CPT code to indicate that a covered service was rendered via real-time, two-way audio-visual communication (i.e., live video telehealth).

In plain English: when you see a patient on a live video platform like Zoom for Healthcare, Doxy.me, SimplePractice, or a similar HIPAA-compliant tool, you add GT to the applicable CPT code on your claim.

Example:

• 90837-GT = 60-minute individual psychotherapy, delivered via telehealth
• 99214-GT = Established patient E/M visit (moderate complexity), delivered via telehealth

The GT modifier has been around since the late 1990s, but its relevance exploded during the COVID-19 public health emergency (PHE) and has only grown since as payers have formalized their permanent telehealth policies.

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GT Modifier vs. 95 Modifier: Which One Do You Use?

This is the single most common question behavioral health billers ask — and the confusion is completely understandable. Here's the core distinction:

Feature	GT Modifier	95 Modifier
Origin	HCPCS Level II	CPT (AMA)
Definition	Via interactive audio and video telecom systems	Synchronous telemedicine service rendered via real-time interactive audio and video telecom system
Primarily Used By	Medicaid, some commercial payers	Medicare, many commercial payers
Who Requires It	Varies by payer — see below	Medicare Part B (primary)
Applicable Services	Broad — mental health, E/M, most outpatient services	Services on the Medicare telehealth list
Place of Service	POS 02 (telehealth, other than home) or POS 10 (telehealth, patient in home)	Same — POS 02 or 10 required alongside
Audio-Only Coverage	No — requires live video	No — requires live video

Bottom line for 2026:

• Medicare patients → Use modifier 95 (not GT). Medicare dropped GT in favor of 95 years ago.
• Medicaid patients → Almost always GT. Confirm with your state Medicaid plan.
• Commercial/private insurance → Check individual payer policies. Many (Aetna, Cigna, UnitedHealthcare, Anthem) have aligned with 95, but some regional and Medicaid managed care organizations still require GT.
• Both on the same claim → Rare, but some payers accept or require both. Don't stack them without payer-specific guidance.

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2026 Payer-by-Payer GT Modifier Requirements

Payer policies have matured significantly heading into 2026. Here's a current snapshot of major payers:

Payer	Modifier Required	Place of Service	Notes
Medicare (Part B)	95	POS 02 or 10	GT no longer recognized by Medicare
Medicaid (most states)	GT	POS 02 or 10	Verify your specific state plan — TMHP (Texas), Medi-Cal (CA), and AHCCCS (AZ) all vary
UnitedHealthcare	95	POS 02 or 10	GT may still process but 95 is preferred
Aetna	95	POS 02 or 10	Behavioral health telehealth broadly covered
Cigna/Evernorth	95	POS 02 or 10	GT accepted for some legacy plans
Anthem BCBS	95 or GT	POS 02 or 10	Check plan-specific policy; both may be accepted
Humana	95	POS 02 or 10	GT may trigger denials on commercial plans
Tricare	GT	POS 02	GT is required for Tricare — do not use 95
VA Community Care	GT	POS 02	Follows Tricare-like conventions
Medicaid Managed Care (varies)	GT	POS 02 or 10	Molina, Centene, WellCare — always verify

Pro tip: Always pull the current telehealth policy addendum from each payer's provider portal before January 1 of each year. Payer policies have a habit of updating quietly over the holidays.

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Place of Service Codes: Don't Forget This Step

The GT modifier doesn't work in isolation — it must be paired with the correct Place of Service (POS) code on your claim. Using the wrong POS is one of the top five reasons telehealth claims get denied or flagged.

• POS 02 — Telehealth provided other than in the patient's home (e.g., patient is at a clinic, school, or another facility)
• POS 10 — Telehealth provided in the patient's home (introduced to distinguish patient location post-PHE)
• POS 11 — Office (used only when billing in-person services; never for telehealth)

For the vast majority of behavioral health telehealth sessions in 2026, your patient is at home — use POS 10.

If your patient is connecting from a non-home location (school-based telehealth, rural health clinic originating site), use POS 02 and confirm whether an originating site fee (Q3014) applies.

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CPT Codes Commonly Billed with GT in Behavioral Health

Here are the CPT codes you'll most frequently append the GT modifier to as a mental health provider:

Psychotherapy (Individual):

• 90832-GT — 30-minute individual psychotherapy
• 90834-GT — 45-minute individual psychotherapy
• 90837-GT — 60-minute individual psychotherapy (most commonly billed)

Psychotherapy Add-Ons with E/M:

• 90833-GT — Psychotherapy with E/M, 30 min add-on
• 90836-GT — Psychotherapy with E/M, 45 min add-on
• 90838-GT — Psychotherapy with E/M, 60 min add-on

Evaluation & Management (Psychiatry):

• 99202-GT through 99215-GT — New and established patient office/outpatient E/M visits
• 99483-GT — Cognitive assessment and care plan services

Psychiatric Diagnostic Evaluations:

• 90791-GT — Psychiatric diagnostic evaluation (no medical services)
• 90792-GT — Psychiatric diagnostic evaluation with medical services

Group Therapy:

• 90853-GT — Group psychotherapy (note: group telehealth coverage varies significantly by payer)

Crisis Services:

• 90839-GT — Psychotherapy for crisis, first 60 minutes
• 90840-GT — Psychotherapy for crisis, each additional 30 minutes

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Documentation Requirements When Billing GT in 2026

Here's where many behavioral health practitioners get into trouble: they append the GT modifier correctly but fail to support it with adequate clinical documentation. If you're audited — and payer audits of telehealth claims have increased more than 300% since 2021 — your notes are your defense.

Your session note must include:

1. Modality confirmation — Explicitly state the session was conducted via telehealth (live video). "Session conducted via secure, HIPAA-compliant video platform" is sufficient.
2. Patient location — Document where the patient was located at the time of service. This matters for interstate licensure compliance and POS accuracy.
3. Provider location — Document where you (the rendering provider) were located.
4. Informed consent for telehealth — Your records should show the patient provided written or verbal consent to receive services via telehealth, including acknowledgment of the limitations of the modality.
5. Technology used — Name the platform (e.g., "Doxy.me," "Zoom for Healthcare"). You don't need the version number, but noting the platform demonstrates HIPAA compliance intent.
6. Medical necessity — Just like in-person, document why telehealth is clinically appropriate for this patient at this time.
7. Time — If billing time-based codes (90837, 90834, etc.), document start and end time or total face-to-face time.

A word on audio-only sessions: The GT modifier is strictly for live audio-video services. If you're conducting a phone-only session, you cannot bill GT. For audio-only telehealth (where applicable), some payers and Medicaid programs have specific codes and modifiers (often modifier FQ for audio-only psychotherapy under Medicare). In 2026, Medicare has extended audio-only coverage for mental health services through the end of the year pending further legislation, so verify current CMS guidance.

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Top GT Modifier Billing Errors (And How to Avoid Them)

1. Using GT for Medicare claims Medicare does not recognize GT. Using it on Medicare claims won't necessarily cause an outright denial (it may simply be ignored), but it signals to your biller that the workflow is outdated. Use 95 for Medicare.

2. Forgetting to update POS from 11 to 10 If your EHR defaults to POS 11 (office), claims will process as in-person services — often at the wrong reimbursement rate and triggering an audit flag.

3. Using GT for asynchronous services Store-and-forward services (like reviewing recorded video or exchanging secure messages) are not GT-eligible. GT is for synchronous, real-time video only.

4. Missing telehealth language in the clinical note A GT modifier on a claim with a session note that reads as a standard in-person visit is a red flag. If your note doesn't mention "telehealth," "video," or "remote," you have a documentation-claims mismatch.

5. Failing to obtain and document telehealth consent Most states and many payers require documented patient consent for telehealth. Lack of a consent form on file is a top audit finding and can trigger recoupment.

6. Billing group therapy via telehealth without payer authorization Group telehealth (90853-GT) is not universally covered. Several major payers require prior authorization or simply exclude group telehealth from coverage. Always verify.

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Interstate Practice and the GT Modifier in 2026

As interstate compact participation grows — the Counseling Compact now covers 40+ states, and PSYPACT covers 40+ states as of 2026 — more providers are seeing patients across state lines via telehealth. A few important notes:

• The GT modifier itself has nothing to do with licensure. But billing GT when you are practicing out-of-scope (unlicensed in the patient's state) creates both a compliance problem and a legal liability.
• Payers may audit for provider and patient location data. If your NPI is registered in Texas but your notes show you've been seeing patients located in Florida without Florida licensure, a GT-flagged audit can surface that issue quickly.
• Always verify your compact participation and active licensure status before billing cross-state telehealth claims.

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How Mozu Health Helps You Get GT Billing Right

The GT modifier is simple on its surface but complex in practice — especially when you're managing a full caseload, multiple payers, and evolving compliance requirements. Manual documentation and billing workflows leave too much room for human error.

Mozu Health is an AI-powered clinical documentation platform built specifically for behavioral health practitioners. Here's how it directly supports GT modifier compliance:

• Smart telehealth session templates that automatically prompt you to document modality, patient location, provider location, platform used, and consent — every single time.
• Modifier and POS logic that flags potential mismatches before a claim goes out (e.g., POS 11 paired with a telehealth note).
• Audit-ready documentation — every note generated through Mozu Health is structured to meet payer documentation requirements, so if an audit comes, your records are already organized and defensible.
• Payer-specific guidance integrated into your workflow so you're never guessing whether a particular plan wants GT or 95.
• HIPAA-compliant infrastructure — your documentation lives in a secure, encrypted environment that meets the same standards required for telehealth delivery itself.

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Frequently Asked Questions About the GT Modifier (2026)

Q1: Can I use GT and 95 together on the same claim line? Generally, no. Most payers recognize one or the other. Stacking GT and 95 on the same service line will typically result in a denial or the secondary modifier being ignored. Some clearinghouses may flag the claim before it even reaches the payer. Use the modifier your specific payer requires — one at a time.

Q2: Does the GT modifier affect my reimbursement rate? It can. Under Medicare, telehealth services (billed with 95) are reimbursed at the same rate as in-person services through at least 2025–2026 under current Congressional extensions. Under Medicaid and commercial plans, rates vary. Some payers apply a 10–15% telehealth reduction; others pay parity. Check your payer contracts and EOBs carefully.

Q3: What happens if I forget to add GT to a claim that was delivered via telehealth? The claim may process as an in-person service — which means you've inadvertently billed for something you didn't deliver. If audited, this can be treated as a billing inaccuracy or upcoding, depending on the context. Always correct the claim with a corrected claim submission before it becomes a bigger issue.

Q4: Is the GT modifier required for all telehealth CPT codes, or just certain ones? GT (or the appropriate telehealth modifier) is required for any CPT code delivered via telehealth when billing to a payer that requires modifier identification of remote services. This includes psychotherapy codes, E/M codes, psychiatric evaluation codes, and crisis codes. The only exceptions are codes that are inherently telehealth-only (like certain remote monitoring codes), which don't require an additional modifier.

Q5: Can LPCs, LCSWs, and LMFTs use the GT modifier, or is it only for physicians and psychiatrists? Any licensed provider who is credentialed with the payer and authorized to provide the service can use the GT modifier — including LPCs, LCSWs, and LMFTs. The modifier identifies the delivery modality, not the provider type. That said, your ability to bill at all for a given service depends on your licensure, payer credentialing, and scope of practice. The GT modifier doesn't expand what you can bill; it just clarifies how it was delivered.

Q6: Does telehealth billed with GT count toward my in-network utilization for managed care audits? Yes. GT-billed telehealth services are treated the same as in-person services for the purposes of utilization review, quality audits, and network participation standards. High utilization patterns can trigger review regardless of modality.

Q7: My state Medicaid program is moving to a managed care model. Will GT still be required? Possibly, but not guaranteed. Medicaid managed care organizations (MCOs) often adopt the state fee-for-service modifier requirements, but some deviate. When your state transitions or introduces new MCOs, pull the updated provider manual for each plan. The shift from FFS to managed care is one of the most common reasons GT billing workflows break down for behavioral health groups.

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Final Takeaways: GT Modifier Billing Checklist for 2026

Before you submit your next telehealth claim, run through this quick checklist:

• ✅ Identified the correct modifier (GT vs. 95) for this specific payer
• ✅ Applied the correct POS code (POS 10 for patient at home; POS 02 otherwise)
• ✅ Session note explicitly references telehealth, video platform, and patient/provider location
• ✅ Telehealth consent documented in the patient record
• ✅ CPT code is on the payer's covered telehealth services list
• ✅ Provider is licensed in the state where the patient was located at time of service
• ✅ No modifier stacking (GT + 95) unless explicitly required by the payer

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Ready to Build a Bulletproof Telehealth Documentation Workflow?

Getting the GT modifier right is only one piece of telehealth billing compliance. The real protection comes from having documentation that's consistently complete, clinically defensible, and aligned with payer requirements — from the moment a session ends to the moment a claim pays.

Mozu Health handles the heavy lifting. Our AI-powered platform auto-generates HIPAA-compliant, audit-ready clinical notes tailored to behavioral health — so you spend less time on paperwork and more time with patients (and less time sweating audits).

👉 Try Mozu Health free at mozuhealth.com — and see how much faster, cleaner, and more confident your telehealth billing workflow can be.

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This content is intended for educational purposes and reflects billing guidance as of early 2026. Payer policies change frequently. Always verify current requirements with individual payer provider manuals and consult a qualified healthcare billing professional for practice-specific guidance.