SLP teletherapy claims fail more often than most disciplines because a single visit stacks four possible modifiers, two POS codes, and a shifting annual threshold — and Medicare, Medicaid, and commercial payers each read that stack differently. This guide breaks down exactly when to use modifier 95 vs. 93 vs. GT, why GN and KX matter even when the telehealth modifier is right, and where POS 02 and POS 10 diverge. It also covers the policy context most billing guides skip: these rules are extended under H.R. 7148 only through December 31, 2027, not permanent law.

Payer-by-payer variance — including state Medicaid parity gaps and commercial audio-only restrictions — is where most SLP practices lose revenue without realizing why. The piece closes with how SPRY's billing engine applies these rules automatically from the SOAP note forward, catching KX threshold crossings and modifier mismatches before a claim goes out.

Somewhere in your practice's aging report right now is a claim that was correct in every way except one: the modifier. Not the CPT code — that was right. Not the documentation that was thorough. Just a single two-character add-on, attached out of habit rather than rule, that sent a clean session into a denial queue.

This happens to speech-language pathologists more than almost any other clinician billing telehealth, for a simple reason: SLPs stack more billing logic onto a single claim than most disciplines. A telehealth session doesn't just need a CPT code. It needs the correct telehealth modifier, the correct place-of-service code, the SLP-specific GN modifier, and — once a patient crosses the annual therapy threshold the KX modifier too. Miss one layer, and the claim doesn't just get delayed. It gets denied, and the fix usually costs more staff time than the visit was worth.

More than 88% of SLPs now deliver at least some care through telepractice, up from just 3.9% before the pandemic.¹ That shift happened fast enough that billing systems, front-office training, and payer contracts didn't always catch up. The result is a coding minefield unique to this moment: rules that were emergency-era workarounds have become semi-permanent policy, but "semi-permanent" is doing a lot of work in that sentence.

This guide breaks down exactly what's required to bill SLP teletherapy correctly in 2026 - the modifiers, the POS codes, the payer-by-payer variance, and the one piece of context most billing guides leave out entirely: the fact that none of this is settled law yet.

The Edge Most Billing Guides Miss: Nothing Here Is Permanent

Most articles on this topic treat modifier 95 and POS 02 as fixed rules. They aren't. They're the current state of a policy that Congress has now extended, allowed to lapse, and extended again - multiple times in the last eighteen months alone.

Here's the timeline that matters for anyone billing SLP telehealth right now: Medicare's expanded telehealth flexibilities briefly lapsed on January 31, 2026, in the middle of a federal government shutdown.² President Trump signed H.R. 7148, the Consolidated Appropriations Act, 2026, into law on February 3, 2026, ending a four-day partial shutdown and retroactively restoring telehealth billing for the gap.³ Section 6209 of that law extends Medicare telehealth flexibilities through December 31, 2027.⁴

That's the good news. The edge case your practice needs to plan around is what happens after that date. These flexibilities have now been extended through short-term legislative action at least three separate times since the original 2020 public health emergency waivers - never through permanent statute.⁵ A bipartisan bill that would make telehealth parity permanent, the CONNECT for Health Act, has more than 280 combined House and Senate cosponsors but has not advanced to a floor vote.⁶ Practices that build billing workflows assuming today's rules are permanent will be the ones scrambling if Congress lets the authority lapse again before the next extension.

The practical takeaway: your billing system needs to be built for change, not just for compliance today. That distinction - building for policy volatility rather than a fixed rule set — is the single most useful lens for an SLP practice evaluating any billing workflow or software in 2026.

The Modifiers: What Actually Goes on an SLP Telehealth Claim

Every SLP telehealth claim carries at least two modifiers, sometimes three. Getting the combination wrong is the single most common cause of preventable denials.

Modifier 95 flags a synchronous, real-time audio-and-video telehealth visit. It only applies to CPT codes that appear on the CMS Medicare Telehealth Services List or the AMA's Appendix P attaching it to an ineligible code triggers an automatic denial regardless of how the visit was actually delivered.⁷

Modifier 93 is the audio-only equivalent. If video drops partway through a session and the visit continues by phone, the correct modifier is 93, not 95 — a distinction billing staff frequently miss because the visit still "felt" synchronous.⁷

Modifier GT is largely retired. CMS eliminated it for Medicare Part B claims in 2018; it now survives only on institutional claims billed under the Critical Access Hospital Method II arrangement.⁷ If your EMR still defaults to GT for professional claims, that's a legacy configuration worth auditing.

Modifier GN is the one general telehealth guides consistently leave out, and it's non-negotiable for SLPs. CMS requires GN on every claim for a service delivered personally by a speech-language pathologist or furnished under an SLP plan of care — telehealth or not.⁸ On a telehealth claim, GN stacks with 95 (or 93). Omit it, and Medicare has no way to attribute the service to an SLP plan of care, which is grounds for denial independent of the telehealth modifier being correct.

There's a nuance here that most billing content misses entirely: ASHA's own telepractice guidance notes that while modifier 95 represents synchronous telehealth, ASHA has specifically recommended that payers accept modifier GT for synchronous services and GQ for asynchronous (store-and-forward) services, arguing that distinguishing between the two delivery modes gives payers more consistent, useful coding data than modifier 95 alone provides.⁹ In practice, most commercial payers still default to 95 — but if a payer contract or remittance advice references GT or GQ for telehealth, that's not necessarily an error. It may reflect this ASHA-recommended distinction, and it's worth confirming with that specific payer before resubmitting.

POS Codes: The Modifier's Quiet Partner

Modifiers say a visit was delivered via telehealth. Place-of-service codes say where the patient was when it happened — and payers use POS as a primary telehealth identifier, sometimes even more heavily than the modifier itself.

ASHA's coding guidance for telepractice recommends billing with POS 02, which designates telehealth generally and is sufficient to identify the service as delivered remotely.¹⁰ CMS's broader telehealth billing framework distinguishes further: POS 10 applies when the patient is at home at the time of the visit, while POS 02 applies when the patient is at a location other than home — a school, another clinic, a relative's house. Getting this distinction backward is a quiet but common source of clean-claim failures, because the POS code alone can trigger a payer's telehealth adjudication logic even when the modifier is correct.

Where the Rules Actually Diverge: Payer to Payer

This is where SLP practices lose the most revenue, and it's structural, not accidental: Medicare, Medicaid, and commercial payers do not use the same signal to identify a telehealth claim.

Medicare leans primarily on POS codes as its main telehealth identifier for professional claims, with modifiers layered on top. Many commercial payers instead require modifier 95 as the primary flag, treating POS as secondary.¹¹ A practice that applies one uniform modifier-and-POS rule across every payer — which is what happens by default in a lot of manually configured billing workflows — will get it right for some claims and wrong for others, with no obvious pattern to the denials until someone audits payer-by-payer.

State Medicaid programs add another layer of variance. Kentucky's Senate Bill 111, effective January 2025, specifically mandated that Medicaid and commercial health plans cover speech therapy delivered via telehealth — a reminder that "does Medicaid cover this" is a state-by-state question for SLPs, not a national given.¹² Nationally, 34 states and the District of Columbia now reimburse Medicaid audio-only telehealth in some form, though nearly all of them attach modality-specific limitations rather than blanket coverage.¹³ On payment parity specifically — whether a state requires telehealth to be reimbursed at the same rate as an equivalent in-person visit — more than half of states now have some form of parity law on the books, up sharply from just 16 states in 2019, according to a Foley & Lardner legal analysis.¹⁴ But "parity" language varies enormously: some states cap it to certain service types, some sunset it on a fixed date, and some apply it only to specific payer categories. A parity law existing in your state doesn't guarantee your specific commercial contract reflects it.

The financial stakes of getting this payer-by-payer logic wrong are compounding. Once a patient crosses the CY 2026 Medicare threshold — set by CMS at $2,480 combined for physical therapy and speech-language pathology services — every subsequent claim requires the KX modifier to confirm medical necessity, or Medicare denies it automatically.¹⁵ Cross a second, separate $3,000 threshold, and the claim becomes eligible for targeted medical review, meaning a Medicare Administrative Contractor can pull the full chart for inspection — not just the code, but the documentation behind it.¹⁵ For a pediatric SLP running weekly telehealth sessions, that $2,480 threshold arrives faster than most practices expect.

SLP Telehealth Modifier & POS Quick Reference

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Where SLPs Lose the Most Time: The Denial Patterns

A few denial patterns show up disproportionately in SLP telehealth claims, and each one traces back to a specific rule above:

• 95 applied to an audio-only visit. The video connection dropped, the session continued, and the claim was submitted with the original modifier instead of switching to 93.
• GN missing on a telehealth claim. Staff remember the telehealth modifier but treat GN as a formality that "usually" gets added elsewhere in the workflow — until it doesn't.
• POS mismatch with modifier. POS 10 billed for a patient who was actually at a school-based originating site, or vice versa.
• KX omitted after threshold crossing. No one is tracking cumulative therapy spend per patient in real time, so the $2,480 line gets crossed mid-month without anyone noticing until the denial arrives.
• One rule set applied across all payers. The modifier-and-POS combination that satisfies Medicare gets applied unchanged to a commercial claim with different requirements.

None of these are documentation failures. The clinical note was fine. The failure happened entirely in the billing layer — which is exactly the layer most practices have the least real-time visibility into.

Where Rules Diverge by Payer Type

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Why This Keeps Happening - and What Actually Fixes It

The underlying problem isn't that SLPs don't understand billing. It's that this specific rule set — four possible modifiers, two POS codes, a threshold that resets every January 1, and a different primary identifier for every payer category — is genuinely difficult to hold correctly in a person's head across a full caseload, week after week, especially when the underlying federal authority itself is only guaranteed through the end of 2027.

This is precisely the kind of layered, easy-to-get-slightly-wrong logic that belongs in software rather than in memory. SPRY's billing engine pulls CPT codes and modifiers directly from the SOAP note at the point of documentation, then applies payer-specific rules — including telehealth modifier selection, POS assignment, and GN attachment — automatically before the claim goes out, which is part of how SPRY practices maintain a 95%+ clean claim rate.¹⁶ Built-in therapy-cap tracking flags KX modifier requirements before a patient crosses the CY 2026 threshold, rather than after a denial arrives. And because the rule engine is payer-specific rather than a single default template, it accounts for the fact that Medicare, Medicaid, and commercial plans don't read the same claim the same way.

For a solo SLP or a growing pediatric practice, that's the difference between billing staff manually tracking a $2,480 running total per patient across a spreadsheet, and having the system catch it automatically before the claim is even generated.

Stop Losing Revenue to Modifier Guesswork

Every rule in this guide — 95 vs. 93, GN, KX, POS 02 vs. 10, and the payer-specific variations layered on top — has to be applied correctly on every single claim, for every patient, every week. SPRY's billing engine handles that automatically: pulling codes and modifiers from the SOAP note, applying payer-specific logic, and flagging KX threshold crossings before a claim ever goes out.

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Frequently Asked Questions

1. What modifier should SLPs use for teletherapy in 2026?

For synchronous audio-and-video teletherapy, modifier 95 is commonly used, while modifier 93 applies to qualifying audio-only services. SLP claims may also require the GN modifier, and KX may be required after the Medicare therapy threshold is reached.

2. Can SLPs use modifier 95 and GN together?

Yes. Modifier 95 identifies the synchronous telehealth service, while GN identifies services delivered by an SLP or under an SLP plan of care. They serve different purposes and can be used together when required.

3. What is the difference between POS 02 and POS 10 for SLP teletherapy?

POS 02 indicates telehealth when the patient is at a location other than home, while POS 10 indicates the patient is at home. The correct POS code depends on where the patient is physically located during the session.

4. Is modifier GT still used for SLP teletherapy?

Modifier GT is largely retired for Medicare Part B professional claims. It remains relevant in limited institutional billing situations, including certain Critical Access Hospital Method II claims. SLP practices should follow the specific payer's current requirements.

5. When should an SLP use modifier 93 instead of 95?

Modifier 93 is used for qualifying audio-only services. If a video session becomes audio-only and the service continues by telephone, the appropriate modifier depends on the payer's rules and whether the service qualifies for audio-only billing.

6. When is the KX modifier required for SLP services in 2026?

For Medicare, the KX modifier is required once a beneficiary exceeds the applicable annual therapy threshold and continued treatment is medically necessary. For 2026, the blog identifies the combined PT and SLP threshold as $2,480.

7. Does every SLP telehealth payer use the same modifier and POS combination?

No. Medicare, commercial insurers, and state Medicaid programs can have different telehealth billing requirements. SLP practices should verify the payer's current rules instead of applying one universal modifier-and-POS combination.

8. Does Medicaid cover SLP teletherapy?

Coverage varies by state. Medicaid programs can differ in telehealth eligibility, audio-only coverage, reimbursement parity, and other requirements, so SLP practices should check their state's current Medicaid policy.

9. What are the most common SLP teletherapy billing mistakes?

Common errors include using modifier 95 for an audio-only visit, omitting GN, using the wrong POS code, failing to add KX after crossing the Medicare threshold, and applying Medicare's rules to commercial or Medicaid claims without checking payer-specific requirements.

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