Telehealth modifiers for behavioral health: 95, 93, GT and POS codes.
Behavioral health runs a higher share of visits over telehealth than almost any other specialty, and its telehealth claims still reject for the same reason they did three years ago: the modifier and the place-of-service code don't agree with each other, or with the payer's actual rule. Medicare identifies a telehealth claim by place of service, not by a modifier the way commercial payers do — and GT, the modifier most training materials still teach, has been dead for standard Part B professional claims since 2018. Here's the mechanism each payer type actually uses, and the specific rejection patterns that come from mixing them up.
Key takeaways
- Medicare identifies telehealth by place of service, not by modifier. POS 02 or POS 10 tells the payer the claim is a telehealth encounter; modifier 93 rides alongside it only to flag that the visit was audio-only.
- GT has been retired for Part B professional claims since the CY2018 fee schedule rule. It survives only for Critical Access Hospital Method II institutional billing — a narrow path most behavioral health practices never touch.
- Commercial and Medicaid claims lean on modifier 95 instead — they don't split payment by POS 02 versus POS 10 the way Medicare does, so treating 95 and 93 as interchangeable across payer types is a reliable source of rejections.
- Behavioral telehealth's geographic and originating-site restrictions are permanently gone under the Consolidated Appropriations Act, 2021 — but the claim still has to carry the right POS and modifier to get paid.
Why this keeps breaking
A behavioral health telehealth claim has three fields that have to agree: the place-of-service code, the telehealth modifier (if any), and the CPT code itself. Get any one wrong relative to the payer's actual rule and the claim rejects before it ever reaches a medical-necessity review — it's a technical edit, not a coverage decision, which means the fix is almost never more documentation. It's a corrected claim with the right combination of fields. Most scrubber misconfigurations in this area trace back to a rule copied from a different payer type, or a rule that was correct in 2019 and never updated.
Medicare's mechanism: POS 02, POS 10, and modifier 93
Medicare's telehealth identification runs through the place-of-service code on the claim, not a universal telehealth modifier. Two POS codes cover the vast majority of behavioral telehealth claims, and they pay differently:
| POS code | Meaning | Payment basis |
|---|---|---|
02 | Telehealth provided when the patient is not located at home — e.g., at a clinic, a facility, or another non-home site | Facility rate |
10 | Telehealth provided when the patient is located at home | Non-facility rate, typically higher |
Getting POS 02 and 10 reversed doesn't usually reject the claim outright — it pays, just at the wrong rate, which is the same underpayment-hides-better-than-a-denial pattern that shows up elsewhere in specialty billing. Confirm where the patient actually was for the visit at the time of scheduling, not by default habit, and code the POS field to match.
Modifier 93 layers on top of the POS code to flag a synchronous audio-only telehealth service — a real-time phone visit with no video component, which Medicare pays under its own specific coverage pathway rather than treating as equivalent to a standard video telehealth visit. A standard audio-video Medicare telehealth visit doesn't need a modifier the way a commercial claim needs 95; POS 02/10 alone identifies it. Append 93 only when the visit genuinely had no video component — not as a default add-on to every telehealth claim, and not interchangeably with modifier 95, which belongs to a different payer logic entirely.
GT: retired for Part B, alive only in one narrow lane
GT reported "via interactive audio and video telecommunication system" back when Medicare used a modifier rather than a POS code to identify telehealth. CMS eliminated that requirement for standard Medicare Part B professional claims in the CY2018 Physician Fee Schedule final rule and replaced it with POS 02. If your clearinghouse or scrubber is still appending GT to a CMS-1500 professional claim under an individual practitioner's NPI, that claim is coded to a rule that's been gone for eight years, and it will either reject or process incorrectly depending on the payer's edit logic.
GT's one surviving use is Critical Access Hospital Method II institutional billing, where the CAH itself bills the distant-site professional service under its own facility billing method rather than the practitioner billing Part B directly under their own NPI. That's a narrow, facility-specific path most behavioral health practices, group practices, and community mental health centers never touch — if your practice bills CMS-1500 professional claims directly, GT does not belong on them.
Commercial and Medicaid: modifier 95, not a POS split
Commercial payers and most state Medicaid programs use modifier 95 as their standard telehealth flag, reporting a synchronous audio-video telehealth service. They generally don't replicate Medicare's POS 02-versus-10 payment split the same way — POS 02 is still commonly reported to commercial payers, but it functions more as a location descriptor than a rate-determining field the way it does for Medicare. The practical difference:
| Payer type | Modifier | POS logic |
|---|---|---|
| Medicare (audio-video) | None required; POS carries the signal | POS 02 or 10 determines the paid rate |
| Medicare (audio-only) | 93 | POS 02 or 10 still applies alongside the modifier |
| Commercial / most Medicaid | 95 | POS 02 commonly reported, but doesn't split payment the way Medicare's 02/10 does — confirm each payer's own billing manual |
| CAH Method II institutional | GT | Billed under the facility's institutional claim, not a professional CMS-1500 |
Treating 95 and 93 as roughly interchangeable "telehealth modifiers," which is how a lot of generic billing guidance frames them, is exactly the mistake that produces rejections: they belong to different payer logics, not different flavors of the same rule. Build the modifier decision off the payer, not off a single house default appended to every telehealth claim regardless of who's paying it.
Permanent coverage, but not a permanent claim shortcut
Behavioral health telehealth coverage itself is on firmer ground than general Medicare telehealth flexibilities, which get extended and occasionally lapse on a rolling legislative schedule. The Consolidated Appropriations Act, 2021 permanently removed geographic and originating-site restrictions specifically for behavioral and mental health services — a Medicare patient can be seen by telehealth from home, anywhere in the country, without that particular flexibility expiring. That permanence is about coverage eligibility, though, not about the claim mechanics: the POS code and modifier still have to be correct for the claim to process, and permanent coverage doesn't override a technical POS/modifier edit.
⚠️ Separate from the geographic restriction removal, federal law has also required an in-person visit with the billing practitioner within a defined window before an initial Medicare telehealth mental health visit (and periodically afterward), with that requirement itself repeatedly delayed by continuing legislation in recent years. This build could not confirm the current, exact status and expiration date of that delay against a primary CMS or legislative source live, so treat it as a live compliance question, not a settled one — confirm the current in-person-visit requirement status for Medicare telehealth mental health services before assuming every patient qualifies for an all-telehealth course of care.
Rejection patterns from POS/modifier mismatches
These are the specific combinations that produce a rejection rather than a processed-but-wrong-rate claim:
- 1POS 11 (office) billed with a telehealth modifier appended. The POS and modifier contradict each other on the claim's face — commonly a CO-5 ("procedure code/bill type is inconsistent with the place of service") rejection.
- 2Modifier 93 appended to a video visit, or 95 appended to a Medicare audio-only visit. The modifier doesn't match the modality actually delivered or the payer's expected modifier — often a CO-4 ("procedure code is inconsistent with the modifier used") rejection.
- 3GT left on a professional CMS-1500 claim. Medicare's Part B edit logic doesn't recognize GT outside CAH Method II institutional billing, so the claim either rejects outright or processes against a rule the payer no longer applies to that claim type.
- 4POS 02 and POS 10 reversed. This one usually pays — at the wrong rate — rather than rejecting, so it needs a deliberate audit of telehealth claims against actual patient location, not a scrubber edit that only catches hard rejections.
Do and don't
- Confirm the patient's actual location (home or not) at scheduling and code POS 02/10 accordingly for Medicare.
- Build separate scrubber rules by payer type — Medicare's POS logic, commercial/Medicaid's modifier 95 logic — instead of one universal telehealth rule.
- Reserve modifier 93 for genuinely audio-only Medicare visits, confirmed from the encounter notes, not appended by default.
- Confirm the current in-person-visit requirement status for Medicare telehealth mental health services before building an all-telehealth care plan.
- Don't append GT to a standard CMS-1500 professional claim — it hasn't been a live Part B modifier for that claim type since 2018.
- Don't treat modifier 95 and modifier 93 as interchangeable "telehealth modifiers" across payer types.
- Don't default POS 02 for every Medicare telehealth claim without checking whether the patient was actually at home (POS 10).
- Don't assume permanent behavioral health telehealth coverage means every claim will process with any POS/modifier combination — coverage and claim mechanics are separate questions.
The same-clinician documentation questions that come up around telehealth psychiatric visits — particularly when medication management and psychotherapy happen in the same virtual encounter — are covered in Billing E/M and psychotherapy same day: 90833, 90836, 90838 and modifier 25. Telehealth doesn't change that add-on logic; it only adds the POS and modifier layer on top of it.
Telehealth claims rejecting on POS or modifier mismatches?
We'll audit a sample of your recent behavioral telehealth claims for POS/modifier logic by payer, show what's misconfigured in your scrubber, and what's recoverable.
Frequently asked questions
What's the difference between modifier 95 and modifier 93 for behavioral health telehealth?
Modifier 95 reports a synchronous audio-video telehealth service and is the modifier most commercial payers and Medicaid programs expect. Modifier 93 is Medicare's own modifier for a synchronous audio-only telehealth service — it exists because Medicare pays audio-only visits under a specific statutory pathway that commercial payers don't replicate the same way. They are not interchangeable: appending 95 to a Medicare audio-only claim, or 93 to a commercial audio-video claim, is a mismatch most clearinghouses will flag or the payer will reject outright.
Is modifier GT ever appropriate for behavioral health telehealth billing in 2026?
Only on Critical Access Hospital Method II institutional claims, where the CAH itself bills the distant-site professional service under its own billing method rather than the practitioner billing Part B directly. CMS eliminated the GT requirement for standard Medicare Part B professional claims in the CY2018 Physician Fee Schedule final rule and replaced it with place-of-service code 02. If your practice bills CMS-1500 professional claims directly under an individual NPI, GT has not been a live modifier for that claim type since 2018, regardless of what an older scrubber template still appends.
Why did our behavioral health telehealth claim reject even though the patient qualified for a covered visit?
The most common cause is a POS/modifier mismatch rather than a coverage problem — billing POS 11 (office) with a telehealth modifier instead of POS 02 or 10, appending 93 to a video visit or 95 to an audio-only Medicare visit, or leaving GT on a professional claim that needs POS 02/10 instead. These are technical rejections (commonly CARC CO-4 or CO-5) that never reach medical necessity review, so fixing the eligible visit's clinical documentation won't resolve them — the claim's POS and modifier fields need to match the payer's actual telehealth billing rule before resubmission.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.