Direct Answer
Speech-language pathology (SLP) billing uses the same timed code structure as physical therapy — the 8-minute rule determines how many units of timed therapy codes can be billed based on total treatment time. The critical SLP billing distinctions are: (1) Modifier SZ (not Modifier GP as in PT) is required on Medicare SLP claims; (2) the Medicare combined therapy cap applies to SLP and PT together (~$3,000 in 2026), while OT has a separate cap; (3) dysphagia, cognitive rehabilitation, and voice disorders each have distinct CPT code families; and (4) augmentative and alternative communication (AAC) device evaluation and the SLP's role in device justification is a specialized billing area with Medicare HCPCS DME coding considerations separate from the therapy codes.
Table of Contents
SLP Timed and Untimed Therapy Codes
SLP uses a combination of timed (time-based) and untimed codes. Timed SLP codes (billed in 15-minute units, 8-minute rule applies): 92507 — treatment of speech, language, voice, communication, and/or auditory processing disorder; individual; this is the primary SLP treatment code covering articulation, language, voice, fluency, and other speech-language goals; 92508 — treatment of speech, language, voice, communication, and/or auditory processing disorder; group, two or more individuals; 92526 — treatment of swallowing dysfunction and/or oral function for feeding; (dysphagia treatment — timed); 97532 — development of cognitive skills to improve attention, memory, problem solving, including compensatory training, direct (one-on-one) patient contact, each 15 minutes; (cognitive rehabilitation — timed); 97533 — sensory integrative techniques to enhance sensory processing and promote adaptive responses to environmental demands, direct (one-on-one) patient contact, each 15 minutes; Untimed SLP codes (reported once per session regardless of time): 92521 — evaluation of speech fluency (e.g., stuttering, cluttering); 92522 — evaluation of speech sound production (e.g., articulation, phonological process, apraxia, dysarthria); 92523 — evaluation of speech sound production with evaluation of language comprehension and expression; 92524 — behavioral and qualitative analysis of voice and resonance; 92597 — evaluation for use and/or fitting of voice prosthetic device to supplement oral speech; 92607 — evaluation for prescription of non-speech-generating augmentative and alternative communication device (first hour); 92608 — AAC evaluation (add-on each 30 minutes); 92609 — therapeutic services for use of speech-generating device, including programming and modification; 8-minute rule: same as PT — if a timed code is performed for at least 8 minutes, 1 unit can be billed; for multiple timed codes in a session, the total time rule applies (see PT billing guide); Documentation requirements: SLP documentation must capture: start and stop times for timed codes; specific goals addressed in each code family; patient response and progress toward goals; plan of care with estimated duration and frequency; skilled care justification (why this requires an SLP rather than a family member or aide).
Dysphagia Evaluation and Treatment
Dysphagia (swallowing disorder) billing requires matching the evaluation code to the method used: Clinical swallowing evaluation: 92610 — evaluation of oral and pharyngeal swallowing function (bedside clinical swallowing evaluation — no imaging); this is the basic clinical swallowing exam performed at bedside; Instrumental swallowing studies: 92611 — motion fluoroscopic evaluation of swallowing function (videofluoroscopic swallowing study — VFSS or modified barium swallow study); requires fluoroscopy equipment; typically performed in a radiology or hospital setting; if the SLP performs and interprets the study, report 92611; if a radiologist separately interprets, TC/PC split applies (92611 for SLP performing with Modifier 26 for SLP's professional interpretation, TC for radiology technician component — however, bundling rules are complex; verify with specific payer); 92612 — flexible fiberoptic endoscopic evaluation of swallowing (FEES); 92613 — evaluation and interpretation of flexible fiberoptic endoscopic evaluation of swallowing (interpretation only); 92614 — flexible fiberoptic endoscopic evaluation with sensory testing (FEESST); 92615 — interpretation only for 92614; 92616 — flexible fiberoptic endoscopic evaluation with sensory testing with laryngoscopy; Dysphagia treatment: 92526 — treatment of swallowing dysfunction and/or oral function for feeding; timed code, billed in 15-minute units; applies to swallowing exercise programs, compensatory strategies, oral sensory stimulation, neuromuscular electrical stimulation (NMES) for swallowing if within SLP scope; NMES for dysphagia (VitalStim): 97014 (electrical stimulation, unattended) is sometimes incorrectly used for NMES dysphagia treatment — the correct code is 92526 for the swallowing treatment when SLP is directing neuromuscular electrical stimulation; documentation must specify the specific dysphagia treatment techniques used; ICD-10 codes for dysphagia: R13.0 — aphagia; R13.10 — dysphagia, unspecified; R13.11 — dysphagia, oral phase; R13.12 — dysphagia, oropharyngeal phase; R13.13 — dysphagia, pharyngeal phase; R13.14 — dysphagia, pharyngoesophageal phase; the specificity of the dysphagia ICD-10 code must match the evaluation findings.
Cognitive Rehabilitation and Aphasia
Cognitive rehabilitation and aphasia treatment represent a large portion of SLP practice in post-acute and outpatient rehabilitation settings: Cognitive rehabilitation codes: 97532 — development of cognitive skills to improve attention, memory, problem solving, including compensatory training, each 15 minutes; used for cognitive-communication disorders following TBI, stroke, dementia, or other neurological conditions; requires documentation of specific cognitive domains addressed (attention, memory, executive function, problem solving) and the techniques used; 97533 — sensory integrative techniques, each 15 minutes; less commonly used for SLP but applicable in pediatric settings; Aphasia treatment: aphasia (acquired language disorder after stroke or brain injury) is treated under 92507 (speech-language treatment, individual); documentation must specify the aphasia type (Broca's, Wernicke's, global, conduction, anomic) and the specific treatment approach used (e.g., Supported Communication Intervention, Treatment of Underlying Forms, PACE therapy, Melodic Intonation Therapy); ICD-10 codes for aphasia: R47.01 — aphasia; G09 — sequelae of inflammatory diseases of central nervous system; use Z87.398 (personal history of other diseases of the nervous system) as appropriate for chronic aphasia; Traumatic brain injury cognitive rehabilitation: for TBI-related cognitive disorders, documentation must include: mechanism and severity of TBI; current cognitive deficits and functional impact; standardized assessment scores (e.g., RBANS, FIM cognitive subscale, MMSE); treatment goals tied to functional outcomes; expected duration of skilled services; Skilled vs. maintenance distinction for cognitive rehab: Medicare and most payers require documentation that cognitive rehabilitation requires the skill of an SLP — not just repetition of tasks that a family member or home health aide could provide; documentation should capture how clinical judgment guides adaptation of tasks based on patient response, error patterns, and cognitive profile.
Medicare SLP Billing Rules
Medicare Part B coverage of SLP services has specific rules that differ from physical or occupational therapy: Modifier SZ requirement: Modifier SZ (services rendered by a speech-language pathologist) is required on all SLP claims billed to Medicare; this is analogous to Modifier GP (physical therapy) and Modifier GO (occupational therapy); failure to append Modifier SZ causes claim rejection; combined PT/SLP therapy cap: the Medicare therapy cap (~$3,000 annually in 2026, with annual COLA adjustments) applies to the combined total of PT services and SLP services; OT has a separate cap of approximately the same amount; once the combined PT + SLP threshold is reached, claims must include the KX modifier to certify that continued services are medically necessary beyond the threshold; claims above the threshold without the KX modifier will be denied; KX modifier for SLP: Modifier KX (requirements specified in the medical policy have been met) is the SLP's certification that: the patient continues to require skilled SLP services; the services are medically necessary and appropriately documented; the treating SLP has documented that continued treatment is required in the plan of care; Medicare SLP coverage criteria: services must: require the skill and judgment of a qualified SLP; be medically necessary; have a reasonable expectation of improvement, OR (under the Jimmo v. Sebelius settlement) be necessary to maintain the patient's current level of function or prevent or slow decline; Jimmo settlement significance: before the 2013 Jimmo v. Sebelius settlement with CMS, Medicare beneficiaries needed to demonstrate improvement to qualify for continued skilled therapy; the settlement clarified that skilled care for maintenance is also covered when the patient requires the skill of a therapist to safely perform the maintenance program; document both the skilled nature of the services and the functional goals (improvement or maintenance); Physician certification of plan of care: Medicare requires that a physician (or NPP) certify the SLP plan of care; the certification must occur within 30 days of the start of treatment; recertification is required every 90 days.
AAC Devices and Voice Disorders
Augmentative and alternative communication (AAC) device evaluation and voice disorder treatment are specialized SLP billing areas: AAC evaluation codes: 92607 — evaluation for prescription of non-speech-generating augmentative and alternative communication device, including assessment and preparation of report, first hour; 92608 — each additional 30 minutes (add-on); 92609 — therapeutic services for use of speech-generating device, including programming and modification; Speech-generating devices (SGD) — HCPCS DME billing: speech-generating devices are billed as durable medical equipment using HCPCS Level II codes (E2500-E2599) rather than CPT therapy codes; Medicare covers SGDs under Part B DME benefit; SLP evaluation (92607/92608) generates the clinical documentation that justifies the SGD prescription; the SGD itself is billed through the DME supplier using the appropriate HCPCS E-code; Medicare SGD requirements: face-to-face evaluation by an SLP documenting: severe expressive communication disorder; patient's cognitive ability to use a device; medical necessity; specific device features required; the SLP generates a letter of medical necessity (LMN) for the DME supplier; Voice disorder treatment: 92507 — treatment of speech, language, voice (includes voice therapy for nodules, polyps, paralysis, spasmodic dysphonia, functional voice disorders); 92524 — behavioral and qualitative analysis of voice and resonance (evaluation); specific voice therapy techniques: vocal hygiene counseling, resonant voice therapy, Lee Silverman Voice Treatment (LSVT), manual circumlaryngeal therapy; LSVT billing: LSVT LOUD (for Parkinson's disease) is a specific evidence-based voice treatment protocol; it follows a defined schedule (4 sessions/week for 4 weeks); billed under 92507 per session with appropriate documentation of the LSVT protocol; document UPDRS scores or equivalent Parkinson's severity data to support medical necessity; Fluency disorders (stuttering): 92521 — evaluation of speech fluency; treatment billed under 92507; document the Stuttering Severity Instrument (SSI) score or equivalent standardized assessment; document the specific treatment approach (e.g., Lidcombe Program, stuttering modification therapy, acceptance and commitment therapy for stuttering).
FAQ
What documentation is needed to justify skilled SLP services vs. non-skilled practice for Medicare claims?
The skilled care distinction is the single most important documentation element for SLP Medicare claims — and the source of the majority of Medicare SLP medical necessity denials and audits. Skilled SLP care requires: clinical judgment beyond what a non-professional can provide: the SLP must be actively making clinical decisions about treatment — adjusting task difficulty, modifying compensatory strategies based on performance, identifying subtle changes in swallowing or communication function that indicate a change in condition or treatment approach; documentation language that demonstrates skill: weak: "Patient performed swallowing exercises as instructed. Patient cooperative." Strong: "Patient presented with increased latency of initiation of pharyngeal swallow (clinically observed), suggesting fatigue affecting swallowing coordination. Adjusted liquid consistency recommendation to nectar-thick from thin-liquid pending re-evaluation. Modified oral motor exercises to focus on posterior tongue strengthening following observation of residue at base of tongue on recent FEES study. Patient demonstrated 80% accuracy on compensatory chin tuck with ongoing cueing required; independent performance not yet achieved."; Functional goals that require skill to achieve: goals should be written in functional terms: "Patient will safely consume thin liquids with modified cup strategy without aspiration, verified by clinical observation, in 6 sessions" — not "patient will perform swallowing exercises for 30 minutes"; Complexity and dynamic nature of the treatment: document why the patient's condition requires ongoing skilled monitoring and adjustment rather than a home exercise program with periodic check-ins; e.g., a patient with progressive neurological disease who requires regular reassessment to identify disease progression and adjust compensatory strategies; Post-acute care documentation (SNF and home health): in SNF and home health settings, additional documentation requirements apply including CARE tool cognitive and communication assessments, daily skilled service notes, weekly progress summaries, and Medicare's documentation standards for inpatient rehabilitation facility (IRF) or SNF level of care.
How do SLPs bill for services provided under a physician's supervision vs. independently?
SLP billing supervision requirements depend on the setting, payer, and the SLP's professional license level: Medicare Part B billing in outpatient settings: a licensed SLP (Certificate of Clinical Competence in Speech-Language Pathology — CCC-SLP) can bill Medicare independently for SLP services in outpatient settings; no physician supervision of the actual service is required at the time of service; the physician certifies the plan of care (within 30 days of initiation and recertified every 90 days) but does not need to be present; billing under a group practice or organization: when an SLP is employed by a physician group practice, hospital outpatient department, or rehabilitation agency, the claims are typically billed under the organization's NPI; the SLP's NPI is reported as the rendering provider; Incident-to billing for SLP: SLP services generally CANNOT be billed incident-to a physician under Medicare Part B in most settings; incident-to requires that the services be within the physician's scope of practice and that the physician directly supervise the auxiliary personnel; SLP services are typically outside the physician's scope of practice; bill under the SLP's own NPI; Speech-language pathology assistants (SLPAs): SLPAs work under the supervision of a CCC-SLP; Medicare does NOT recognize SLPAs as independent billers — services provided by an SLPA must be billed under the supervising SLP; some state Medicaid programs cover SLPA services with appropriate supervision documentation; CCC-SLP vs. CFY (Clinical Fellowship Year): speech-language pathologists completing their Clinical Fellowship Year (CFY) — required for ASHA certification — are supervised by a CCC-SLP; during the CFY, the SLP may bill under the supervising CCC-SLP's NPI in some settings, or may have their own provisional license for billing in others; verify state licensing and payer requirements for CFY billing.
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