Speech-Language Pathology CPT Billing in 2026: Evaluation Codes, the 92522/92523 Trap, and What's Changing in 2027
An SLP completes a thorough articulation and language evaluation, documents it well, and the claim still denies because both the sound-production code and the comprehensive code got billed for the same date. This single bundling rule accounts for a disproportionate share of SLP evaluation denials, and it's just one of several places where speech-language pathology billing differs meaningfully from physical and occupational therapy billing, despite sharing some structural rules.
This guide covers how SLP CPT coding actually works in 2026, where evaluation code selection most commonly goes wrong, and a significant coding change already scheduled for 2027 that practices should start tracking now.
QUICK ANSWER • Speech-language pathology evaluation codes (92521 fluency, 92522 speech sound production, 92523 speech sound plus language, 92524 voice/resonance) are untimed — billed once per encounter based on what was actually assessed. CPT 92523 already includes everything 92522 covers, so the two are NCCI-bundled and cannot both be billed for the same date of service. Treatment codes (92507 individual, 92508 group, 92526 swallowing/feeding) are also untimed and billed once per session, while cognitive-communication codes (97129/97130) are timed. Medicare Part B claims require the GN discipline modifier, and the same $2,480 KX threshold that applies to combined PT/SLP spending for 2026 applies here as well. A significant change is already scheduled: CPT 92507 remains billable through December 31, 2026, but the AMA is replacing it with a set of ten timed treatment codes effective January 1, 2027. |
SLP Evaluation Codes: Selection Is About What Was Tested, Not Default Habit
Unlike PT and OT evaluation codes, which tier by complexity, SLP's four evaluation codes are differentiated by which specific disorder domain was actually assessed. All four are untimed — one unit per evaluation, regardless of session length.
CPT Code | What It Evaluates | Scope | Same-Day Pairing Notes | |
92521 | Fluency evaluation | Stuttering, cluttering, and related fluency disorders | Pairs cleanly with 92523 or 92524 on the same date when a separate, distinct evaluation was genuinely performed | |
92522 | Speech sound production only | Articulation, phonology, apraxia, or dysarthria — sound production alone, no language battery | Bundled with 92523 — never bill both on the same date of service | |
92523 | Speech sound production plus language comprehension/expression | Includes everything 92522 covers, plus a language measure (e.g., a standardized comprehension/expression battery) | The code most frequently targeted in upcoding review — only appropriate when language was actually tested, not by default | |
92524 | Behavioral and qualitative voice/resonance analysis | Voice quality and resonance assessment | Distinct from the speech-sound and language codes; can pair with 92521 same-day | |
THE MOST COMMON SLP BILLING ERROR 92522 vs. 92523: Where the Money Gets Lost or Clawed Back • 92523 already contains everything 92522 covers — the CPT manual and current NCCI edits bundle them, and reporting both on the same date triggers an automatic denial. The clinical decision is straightforward: if the evaluation tested speech sound production only, bill 92522. If it also included a language comprehension and expression measure — a standardized battery, not just informal observation — bill 92523 instead of 92522, never both. • Defaulting to 92523 because it "sounds more comprehensive" when no language battery was actually administered is a recognized target of payer and industry compliance review. The reverse error — billing 92522 when a full language battery genuinely was given — undercodes the work actually performed. |
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When an evaluation starts as a full speech-and-language assessment but doesn't get completed — a pediatric patient becomes distressed, time runs out — the full 92523 code shouldn't be billed for a partial assessment. Modifier 52 (reduced services) signals that the documented service was less than the code's full scope.
SLP Treatment and Specialty Codes
Most SLP treatment codes are untimed — billed once per session regardless of how long the encounter actually ran, which is a structural difference from PT and OT's 15-minute-unit treatment codes. The exceptions are the cognitive-communication codes (97129/97130), which follow the same timed-unit logic used across therapy billing, and require documented cognitive-communication deficits with measurable treatment goals.
The Modifier That Cannot Be Missing: GN
GN is SLP's discipline modifier, required on essentially every Medicare Part B SLP procedure code to indicate the service was delivered under a speech-language pathology plan of care. Missing it is one of the most straightforward, entirely avoidable causes of automatic denial. It's easy to confuse with GP (physical therapy) and GO (occupational therapy) in a multi-discipline clinic — confirm the correct discipline modifier is applied consistently across every SLP claim line.
The KX modifier threshold that applies to combined PT and SLP spending for 2026 is $2,480, per current CMS Therapy Services guidance — tracked cumulatively per patient across the calendar year, not per visit. Verify the current-year figure each January, since it updates annually.
A Change Already Scheduled: CPT 92507's Replacement in 2027
This is worth flagging now rather than waiting until it takes effect. CPT 92507 — the most frequently billed SLP treatment code — remains billable through December 31, 2026. The AMA has finalized a replacement: a set of ten timed treatment codes taking effect January 1, 2027, restructuring how individual SLP treatment sessions are coded and billed going forward.
LOOKING AHEAD Prepare Before the Transition, Not On the Transition Date • Practices billing high volumes of 92507 should begin tracking current AMA and CMS guidance on the replacement code set well before January 1, 2027, rather than waiting for the effective date to arrive. A shift from a single untimed code to multiple timed codes changes documentation requirements — time-per-service tracking becomes relevant for SLP treatment billing in a way it currently isn't under 92507. |
Separately, CMS added new Remote Therapeutic Monitoring codes (98979, 98984, 98985) effective January 1, 2026, relevant to practices incorporating remote monitoring into speech-language treatment. Verify current billing requirements for these codes directly with CMS before incorporating them into your workflow, since RTM billing carries its own distinct documentation and monitoring-period requirements.
Telehealth and SLP Billing
Medicare telehealth authority for SLP services has been extended, covering codes including 92507, 92508, 92521–92524, and 92526. Telehealth claims generally require modifier 95 for synchronous audio-video service and correct place-of-service coding (POS 02 for non-home, POS 10 for home). Payment parity varies by payer — verify current policy per payer rather than assuming uniform treatment across your caseload.
Common SLP Billing Errors
Error | Why It Happens | Prevention |
Billing 92522 and 92523 on the same date | 92523 already includes everything 92522 covers — CPT and NCCI bundle them, and reporting both triggers an automatic denial | Select one code based on what was actually tested — never both for the same encounter |
Defaulting to 92523 because it sounds more comprehensive | 92523 carries a higher value than 92522, creating pressure to default to it even without a language battery | Bill 92523 only when a genuine language measure was actually given and documented |
Undercoding by billing 92522 when a language battery was given | The opposite error — using the lower-value code when documentation supports the more comprehensive one | Match the code to the full scope of what was tested |
Billing 92521-92524 for a treatment session | These are evaluation-only codes; treatment belongs under 92507, 92508, 92526, or the cognitive codes | Reserve evaluation codes strictly for initial assessments or re-evaluations |
Missing the GN modifier on Medicare claims | GN indicates the service was delivered under an SLP plan of care | Build GN into the claim template as a default for every applicable line |
Billing a full 92523 when the evaluation was cut short | A session that starts as a full evaluation but ends early doesn't support the full comprehensive code | Append modifier 52 (reduced services) rather than billing the full code |
Continuing to use 92507 without watching the 2027 transition | The AMA is replacing CPT 92507 with ten timed treatment codes effective January 1, 2027 | Begin reviewing the replacement code set well before the transition date |
Before You Submit: SLP Claim Checklist
☐ Evaluation code selected from what was actually tested, not habit or referring diagnosis
☐ 92522 and 92523 never billed together for the same date of service
☐ Modifier 52 applied if an evaluation was started but not completed
☐ Evaluation codes used only for initial assessments or genuine re-evaluations, never for treatment sessions
☐ GN modifier present on every applicable Medicare claim line
☐ KX modifier applied only once the current-year combined PT/SLP threshold is actually crossed for that patient
☐ Telehealth claims carry modifier 95 and the correct POS when applicable
☐ Cognitive-communication codes (97129/97130) supported by documented deficits and measurable goals, with time tracked accurately
☐ Current-year code status confirmed, especially heading into the 2027 92507 transition
How MedCloudMD Supports Speech-Language Pathology Billing
Our billing specialists and certified coding professionals support SLP practices with evaluation-code selection review, GN/KX modifier accuracy, claim scrubbing built around the 92522/92523 bundling rule, denial management, and revenue-cycle reporting — including helping practices prepare for the 2027 CPT 92507 transition ahead of time rather than reactively. We don't promise a specific reduction in denials or guaranteed reimbursement outcomes — no billing partner honestly can. What we focus on is helping practices build a documentation and coding workflow that holds up consistently.
Frequently Asked Questions
Can CPT 92522 and 92523 be billed on the same date?
No. CPT 92523 already includes everything 92522 covers, and current NCCI edits bundle them — reporting both for the same date of service triggers an automatic denial. Select the single code that matches what was actually tested.
What's the difference between CPT 92522 and 92523?
92522 covers speech sound production evaluation alone — articulation, phonology, apraxia, or dysarthria. 92523 covers speech sound production plus a language comprehension and expression measure. Use 92523 only when a genuine language battery was actually administered.
Are SLP evaluation codes timed or untimed?
Untimed. Codes 92521 through 92524 are billed once per encounter based on what was assessed, regardless of how long the evaluation actually took.
What modifier is required on Medicare SLP claims?
GN, on essentially every SLP procedure code billed under a speech-language pathology plan of care. Missing it is a common, entirely avoidable cause of automatic denial.
What is changing with CPT 92507 in 2027?
The AMA is replacing CPT 92507 — currently the most frequently billed SLP treatment code — with a set of ten timed treatment codes, effective January 1, 2027. CPT 92507 remains billable through December 31, 2026. Practices should begin reviewing the replacement code set and its documentation requirements well ahead of the transition.
Can evaluation codes 92521-92524 be billed for a treatment session?
No. These codes are reserved for initial evaluations or genuine re-evaluations. Treatment sessions should be billed under 92507, 92508, 92526, or the appropriate cognitive-communication codes.
What is the 2026 KX threshold for speech-language pathology?
$2,480, combined with physical therapy spending, per current CMS Therapy Services guidance. This threshold is tracked cumulatively per patient across the calendar year and updates annually — verify the current figure directly with CMS.
What should be documented if an SLP evaluation is cut short?
Append modifier 52 (reduced services) rather than billing the full comprehensive evaluation code when the assessment wasn't actually completed as planned.
Last reviewed: September 2026
Medicare therapy payment policy, coding requirements, and payer-specific rules change over time, including the scheduled 2027 CPT 92507 transition. Verify current requirements before submitting claims.
Disclaimer
This article is provided for general educational and informational purposes only and does not constitute legal, medical, coding, billing, or reimbursement advice. Speech-language pathology coding requirements, evaluation criteria, payment methodology, and payer-specific rules can change and may vary by payer, plan, jurisdiction, and individual patient circumstances. Practices should verify current requirements directly with CMS, applicable Medicare Administrative Contractors, the AMA, and each relevant payer before submitting claims. MedCloudMD does not guarantee reimbursement, claim approval, or specific financial outcomes.
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