A biller at a mid-size outpatient practice submits a batch of forty telehealth claims on a Friday afternoon. Half come back rejected before they even reach the payer not because the sessions weren't covered, but because half the claims carry modifier GT and half carry modifier 95 and the clearinghouse edit rules won't let the two sit on the same batch without a payer-specific reason. That scenario plays out in behavioral health billing departments every week and it almost always traces back to one thing: nobody built a clear, payer-by-payer rule for when GT actually belongs on a claim in 2026.
This guide breaks down what the GT modifier means, where it still applies, where it's obsolete and how it interacts with Medicare, Medicaid and commercial telehealth billing with coding examples, denial patterns and documentation standards a billing team can actually use.
What Is the GT Modifier?
GT is a HCPCS Level II modifier not a CPT modifier that gets appended to a procedure code to tell a payer a service was delivered through a live, two-way audio-and-video connection instead of in person. It's shorthand the claims-processing system reads as: this encounter happened over video, adjudicate it accordingly.
The modifier itself doesn't create coverage. It flags a delivery method on a service that still has to meet medical necessity, be performed by an eligible provider type and appear on that payer's approved telehealth code list. Attach GT to a code that isn't telehealth-eligible for a given payer and the claim denies anyway the modifier just explains how the ineligible service was delivered.
GT Modifier Description
In CMS's original coding guidance, GT identifies a professional service delivered through a real-time, interactive audio-and-video connection between provider and patient the same synchronous, two-way concept that modifier 95 was later built to describe for CPT purposes.
Two details matter in day-to-day coding. First, "interactive" and "audio and video" both have to be true. A phone-only session isn't a GT (or 95) service; that belongs under modifier 93 or FQ where the payer covers audio-only behavioral health. Second, the visit has to happen in real time. Store-and-forward review of images or recorded content evaluated later, not live falls under modifier GQ, which is limited to specific federal telemedicine demonstration programs and isn't a general-purpose substitute for GT.
When the GT Modifier Is Used
GT still shows up on legitimate claims in a handful of specific situations:
- Payer contracts that were negotiated before 2018 and were never formally updated to modifier 95
- State Medicaid fee-for-service programs that continue to list GT as the required telehealth identifier
- Critical Access Hospital (CAH) Method II institutional claims, where GT remains the standard even for services that would use 95 anywhere else
- Smaller regional commercial plans, self-funded employer plans, or third-party administrators whose claims-editing logic hasn't caught up with newer telehealth modifiers
Outside of those situations, defaulting to GT out of habit is one of the more common and avoidable sources of telehealth claim rejections.
How GT Modifier Billing Works
On a CMS-1500 claim, the procedure code sits in field 24C, the place-of-service (POS) code in 24B and up to four modifiers in 24D. GT gets appended next to the CPT or HCPCS code and it has to travel with a POS code that actually supports telehealth POS 02 for a patient located somewhere other than home, or POS 10 for a patient located at home.
The modifier alone doesn't get a claim paid. Before it goes out, AAPC-certified coders generally check three things: whether the code is on that specific payer's current telehealth list, which modifier that payer actually recognizes this year and which POS code is supposed to pair with it. Miss any one of the three and a technically correct modifier still rides along on a denied claim.
GT Modifier and Telehealth
Telehealth billing rules didn't settle into one fixed standard they split by payer and GT is the older half of that split. Medicare moved professional claims off GT and onto POS-driven billing back in 2018. Commercial insurers mostly followed with modifier 95. Medicaid never got the memo uniformly, so GT survived in a meaningful number of state programs.
For outpatient behavioral health practices juggling all three payer types in the same week, the practical reality is that the same video session might need GT on one claim, 95 on the next and no modifier at all just a POS code on a third, depending entirely on who's paying. Practices billing outpatient behavioral health services across a mixed payer panel run into this constantly and it's exactly the kind of variation that trips up a biller working from memory instead of a written payer matrix.
GT Modifier vs. Modifier 95
| GT Modifier | Modifier 95 | |
|---|---|---|
| Modifier type | HCPCS Level II | CPT (AMA-maintained) |
| What it signals | Real-time, interactive audio-and-video telehealth | Real-time, synchronous audio-video telemedicine |
| Medicare Part B professional claims | Retired since January 1, 2018 | Generally not required POS carries the signal though some payers still request it |
| Medicare CAH Method II | Still applies | Not applicable |
| Commercial payers | Legacy or limited acceptance | Current default for most plans |
| State Medicaid | Required by some state programs | Required or accepted by many state programs |
| Claim form placement | Field 24D, with the code in 24C | Field 24D, with the code in 24C |
Neither modifier is universally "correct." The payer decides, not the technology used or the provider's preference.
GT Modifier and CPT 99214
99214 is an established-patient office visit of moderate complexity a code psychiatrists and psychiatric nurse practitioners lean on heavily for medication management. On a legacy Medicaid claim that still requires GT, a telehealth med-management visit gets billed as 99214-GT with POS 02. On a current commercial claim, the same visit typically goes out as 99214-95 with POS 10 if the patient was home.
When a prescriber also provides a brief psychotherapy service in that same visit commonly paired with add-on code 90833 the modifier follows the E/M code, not the add-on. Getting that pairing wrong is a recurring source of downcoding in psychiatry billing and psychiatric NP billing, especially when a practice's EHR template defaults to one modifier across every payer.
GT Modifier and CPT 90837
90837 a 60-minute individual psychotherapy session is probably the single code most associated with GT-versus-95 confusion in behavioral health, simply because psychotherapy accounts for such a large share of telehealth volume. A 60-minute video session for a commercially insured client is typically billed 90837-95 with POS 10 today. The identical session, same clinician, same client, billed instead to a state Medicaid plan that hasn't retired GT, might legitimately go out as 90837-GT with POS 02.
This is where therapy and counseling billing gets genuinely payer-specific rather than following one house rule. A practice that standardizes on 95 for every payer will eventually collect a wave of denials from the Medicaid plans in its panel that never made that switch.
GT Modifier Reimbursement
Where GT is still accepted, it's generally reimbursed on the same fee schedule as the underlying CPT code the modifier changes how the claim is processed, not the code's base rate. That said, "generally" is doing real work in that sentence. Some payers apply a slightly reduced telehealth rate compared to in-person care; others pay parity. Audio-only visits, billed with 93 or FQ rather than GT or 95, sometimes reimburse at a different rate entirely depending on the payer and the year.
Because reimbursement rules shift by payer and by plan year, the safest habit is reconciling every telehealth remittance line-by-line rather than assuming the expected rate. Catching a systematic underpayment on telehealth claims say, a payer quietly applying an audio-only rate to a video visit is exactly the kind of pattern that shows up during careful payment posting rather than at a glance.
GT Modifier Medicare Rules (2026)
Medicare's relationship with GT is the part of this topic people get wrong most often, usually in one of two opposite directions. CMS eliminated the requirement to use GT on Medicare Part B professional claims effective January 1, 2018, replacing it with place-of-service coding (02 and later 10 for home-based telehealth). Some Medicare Administrative Contractors still process a GT-appended claim without incident; others don't and habitually including it on Medicare claims risks confusion during an audit even when it doesn't cause an outright denial.
The one place GT genuinely survives in Medicare billing is Critical Access Hospital Method II institutional claims, where it remains standard practice rather than a legacy artifact.
Broader Medicare telehealth policy has also moved in 2026. Congress extended a range of Medicare telehealth flexibilities including geographic and originating-site waivers through December 31, 2027, under the Consolidated Appropriations Act signed in February 2026, after those provisions briefly lapsed during a funding gap the prior fall. Separately, behavioral health telehealth carries some flexibilities that aren't tied to those short-term extensions at all, including the ability to use the patient's home as the originating site for mental health visits. Because Congress has repeatedly revisited these dates, confirm current CMS guidance before relying on any specific expiration date.
GT Modifier for Medicaid
This is where GT is least standardized. Some state Medicaid programs still require it on every eligible telehealth claim; others have moved fully to modifier 95; a few accept either and a handful use both a modifier and a separate telehealth-specific procedure code. A few real examples illustrate the range:
- Some state Medicaid managed care policies explicitly exclude GT and require modifier 95 or 93 instead, with claims reported under the standard place-of-service code denying if POS 02 is used incorrectly.
- Other state Medicaid fee-for-service programs still list GT as a required telehealth modifier for behavioral health codes.
- Some states accept either GT or 95 for synchronous audio-video visits, with separate modifiers for audio-only encounters.
None of that is stable enough to memorize once and forget. Medicaid telehealth policy gets revised often enough sometimes mid-year that a modifier matrix built in January can be wrong by summer. Verifying insurance eligibility and coverage details before the visit, rather than after the claim denies, catches most of these mismatches early.
Which Payers Still Accept the GT Modifier?
| Payer Category | Typical Modifier Today | Typical POS | Key Caveat |
|---|---|---|---|
| Medicare Part B (professional) | Usually none POS carries the signal | 02 or 10 | GT retired in 2018; still used on CAH Method II institutional claims |
| Medicare Advantage | 95 | 02 or 10 | Follows CMS's general direction, but plan-level rules can differ |
| State Medicaid (varies by state) | GT in some states, 95 in others, occasionally both | Usually 02 | Confirm against the current state Medicaid manual or MCO policy |
| Commercial / legacy plans | 95 is standard; GT still accepted by some smaller or older plans | 02 or 10 | Contract-specific check the payer's current telehealth bulletin |
How to Choose the Correct Modifier
A short, repeatable process prevents most of the guesswork:
- Pull the payer's current telehealth policy not last year's version before assuming anything.
- Confirm the CPT/HCPCS code is actually on that payer's approved telehealth list.
- Match the technology correctly: audio-video goes under GT or 95; audio-only goes under 93 or FQ, never GT.
- Pair the modifier with the POS code the payer expects; a correct modifier with the wrong POS still denies.
- Never stack GT and 95 on the same line pick the one the payer actually wants.
Documentation Requirements for GT Modifier Claims
| Documentation Element | Why It Matters |
|---|---|
| Technology used (audio-video vs. audio-only) | Determines whether GT/95 or 93/FQ is the correct modifier |
| Patient's physical location during the visit | Supports POS selection and originating-site eligibility for some payers |
| Start and stop times for time-based codes (e.g., 90837) | Prevents downcoding to a shorter session code on review |
| Documented patient consent to telehealth | Required under many state laws and payer contracts |
| Clinical rationale for choosing telehealth | Supports medical necessity if the claim is ever audited |
| Provider's licensure status in the patient's state | Cross-state telehealth rules and licensure compacts affect coverage |
Common Billing Mistakes and How to Prevent Them
| Mistake | Consequence | Fix |
|---|---|---|
| Appending both GT and 95 to the same claim line | Most clearinghouse edits reject the combination outright | Pick the modifier the specific payer requires never both |
| Defaulting to GT on Medicare Part B professional claims | Signals an outdated workflow; handling varies by contractor | Use POS 02/10, adding 95 only if the payer still asks for it |
| Billing GT or 95 on an audio-only encounter | Misrepresents the delivery method and creates compliance risk | Use modifier 93 or FQ where the payer supports audio-only coverage |
| Mismatched POS and modifier pairing | Many payer systems cross-check the two and will suspend or deny the claim | Confirm the current POS/modifier pairing before submission |
| Applying an old payer rule without checking for updates | Medicaid and commercial telehealth policy change frequently, sometimes mid-year | Keep a payer-specific modifier matrix and review it on a set schedule |
Most of these errors are caught or should be caught before a claim ever leaves the building. Practices that build payer-specific edits into their claim submission process typically see far fewer telehealth rejections than practices relying on a single EHR default modifier for every payer.
When a mismatched modifier does slip through, the resulting denial isn't a dead end it's a task. Categorizing telehealth denials by root cause and feeding that pattern back into the scrub rules is standard practice in a working denial management workflow and it's usually the fastest way to stop the same denial from repeating the following month.
Compliance Considerations
A modifier is a signal, not a substitute for documentation. The clinical note has to independently support the level of service billed, the medical necessity of the visit and the delivery method the modifier claims. Auditors reviewing telehealth claims typically look for consistency across three things: the modifier on the claim, the POS code and the note itself.
For behavioral health specifically, substance use disorder records carry additional protection under 42 CFR Part 2, which restricts how those records can be disclosed even within routine billing workflows. Practices billing telehealth substance use services need documentation and consent processes that account for that layer on top of standard HIPAA requirements. Informed consent for telehealth itself is also worth building into every note template, since a number of states require it as a condition of coverage, not just good practice.
Real Practice Scenarios
A therapy practice split between commercial and Medicaid clients. The same clinician runs identical 45-minute video sessions back-to-back. One client's commercial plan wants 90834-95 with POS 10. The next client's state Medicaid plan still requires 90834-GT with POS 02. Nothing about the clinical encounter changed only the payer's rulebook did.
A psychiatric NP doing medication management by video. A 99214 visit for an established patient, billed with modifier GT to a legacy payer contract that was never updated, gets flagged during a routine PMHNP billing review because that same payer switched to 95 eighteen months earlier without much notice. The fix is a five-minute policy check; the cost of not catching it is a denied claim and a delayed payment cycle.
A group practice with multiple billing NPIs. In group and multi-provider billing, a modifier mismatch on one clinician's claims can sit unnoticed longer simply because there's more volume to sort through which is exactly why a written, payer-specific modifier reference matters more, not less, as a practice scales.
Claims Workflow Tips and Audit Checklist
- Verify telehealth benefits and modifier requirements during eligibility verification, before the appointment happens, not after the claim denies.
- Keep a living, payer-specific modifier matrix rather than relying on memory or a single EHR default.
- Run pre-submission claim scrubbing that checks modifier, POS and code eligibility together, not in isolation.
- Reconcile every telehealth remittance against the contracted rate to catch quiet underpayments.
- Work aged telehealth denials on a set schedule; a denial that sits unworked can age past the payer's timely filing window and become unrecoverable a core reason consistent A/R follow-up matters as much for telehealth claims as for any other claim type.
- Review payer bulletins on a recurring basis quarterly at minimum since Medicaid and commercial telehealth rules change without much warning.
How Professional Billing Support Helps
None of this is complicated in isolation. What makes GT modifier billing genuinely hard is volume combined with variation dozens of payers, each with its own rules, each capable of changing those rules with little notice, multiplied across every telehealth claim a practice submits in a month.
That's the gap a dedicated behavioral health billing partner is built to close. Full mental health revenue cycle management folds eligibility verification, coding, claim submission, payment posting, denial management and A/R follow-up into one coordinated process, with payer-specific telehealth rules built into the scrub layer instead of left to individual judgment on a busy Friday. Practices that outsource this piece typically aren't looking to hand off clinical decisions they're looking to stop losing revenue to a modifier mismatch nobody had time to catch. You can read more about the team's background on the About page, or get in touch to talk through a specific payer mix.
Future Billing Updates for 2026 and Beyond
A few developments are worth watching over the rest of the year:
- FQHC/RHC billing change, effective October 1, 2026. Rural Health Clinics move away from the single catch-all code G2025 for telehealth and must instead bill individual HCPCS codes describing the specific service delivered a meaningful workflow change for any practice billing through an RHC or FQHC arrangement.
- Medicare telehealth flexibilities extended through December 31, 2027, under the Consolidated Appropriations Act signed in February 2026, following a brief lapse tied to a funding gap in late 2025. These provisions have been extended repeatedly on a short-term basis, so treat the current end date as the latest checkpoint, not a permanent fix.
- The in-person visit requirement for mental health audio-only telehealth has, per current federal guidance, been pushed back again this time to January 1, 2028 though this is another provision that has moved before and could move again.
Given how often these dates shift, building a habit of checking CMS and state Medicaid bulletins on a recurring schedule is more reliable long-term than memorizing any single date in this article.
Key Takeaways
- GT is a HCPCS Level II modifier for real-time, audio-video telehealth; it isn't interchangeable with 95, 93, or FQ.
- Medicare retired GT for Part B professional claims in 2018, though it survives on CAH Method II institutional claims.
- Medicaid rules vary enormously by state and change often verify current policy rather than assuming last year's rule still holds.
- The modifier only works correctly when paired with the right POS code and supported by documentation that matches the delivery method billed.
- Payer-specific verification, before and after the claim goes out, prevents the majority of telehealth denials this modifier tends to cause.
Conclusion
The GT modifier hasn't disappeared it's just narrowed into specific corners of Medicare, Medicaid and legacy commercial billing where habit and history keep it alive. Getting it right in 2026 means treating every payer as its own rulebook rather than applying one default across the board, documenting the delivery method as carefully as the clinical content and rechecking policy on a schedule instead of waiting for a denial to force the update. For practices juggling that variation across a full behavioral health caseload, a free A/R and claims audit is usually the fastest way to see exactly where telehealth modifier errors are costing revenue today.
Frequently Asked Questions
It depends entirely on the payer. Medicare and most commercial plans default to 95 (or no modifier at all on Medicare, since POS carries the signal), while some state Medicaid programs and legacy contracts still require GT. Check the specific payer's current policy before submitting.
No. Both describe real-time, interactive audio-video telehealth, but GT is a HCPCS Level II modifier while 95 is a CPT modifier. Payers choose which one they accept and using the wrong one for a given payer can cause a rejection.
Sometimes. A number of state Medicaid programs still require GT, while others have moved to 95 or accept either. This varies by state and can change from year to year, so confirm current requirements with the specific state Medicaid manual or MCO.
It indicates that the established-patient office visit described by 99214 often a medication management visit for psychiatric or nurse practitioner prescribers was delivered through live audio-video telehealth rather than in person, for a payer that still recognizes GT.
It flags that a covered service was delivered through a real-time, interactive audio-and-video connection between provider and patient, rather than an in-person encounter.
Primarily on claims to payers that haven't transitioned to modifier 95 certain state Medicaid fee-for-service programs, some legacy commercial contracts and Critical Access Hospital Method II institutional claims.
Not for standard Part B professional claims CMS retired that requirement in 2018 in favor of place-of-service coding. GT remains in use specifically for Critical Access Hospital Method II institutional billing.
Yes, where a payer still recognizes it. GT was designed specifically to identify telehealth delivered through synchronous audio-video technology and it still functions that way wherever payers haven't moved fully to modifier 95.
Functionally, both describe the same kind of visit live, two-way audio and video. The difference is which payers currently recognize which modifier and mixing them up is one of the more common causes of avoidable telehealth denials.
Where a payer accepts GT, reimbursement is generally based on the same fee schedule as the underlying CPT code the modifier affects processing, not the base rate. Some payers do apply different rates for audio-only versus audio-video visits, so verify the specific payer's telehealth fee policy.
Outcomes range from an outright denial to a delayed clearinghouse rejection to a downcoded or underpaid claim, depending on the payer's edit logic. Reworking these claims after the fact takes longer than getting the modifier right the first time.
Claims that stack GT and 95 together, apply GT to a Medicare Part B professional claim inconsistently with the payer's current rules, or pair GT with the wrong place-of-service code are the most frequent denial patterns.
Yes, for payers that still require it commonly certain state Medicaid programs. The same 90837 session might be billed 90837-GT for one payer and 90837-95 for another, depending entirely on payer policy.
Inconsistently, by design of how telehealth policy evolved. Medicare largely moved away from it, most commercial payers followed with modifier 95 and Medicaid remains a patchwork where GT, 95, or both can be correct depending on the state.
The note should confirm the technology used (audio-video, not audio-only), the patient's location during the visit, start and stop times for time-based codes, documented consent to telehealth where required and a clinical rationale supporting medical necessity.