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    v1.0.28
    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g9171-voice-functional-limitation-assessment
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    HCPCS G9171: Voice Functional Limitation, Therapy Episode

    HCPCS Level II code G9171 describes documentation of voice functional limitation, recorded as the patient’s current status at therapy episode outset and at reporting intervals; this represents a speech-language pathology functional assessment used to track voice function over the course of therapy. The service is an assessment/functional status reporting activity typically performed in outpatient speech-language pathology clinics or rehabilitation settings to document baseline voice impairment and changes at defined reporting intervals.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is a 45-year-old professional singer presenting to outpatient speech-language pathology with progressive hoarseness, reduced vocal endurance, and decreased pitch control for 3 months following an upper respiratory infection. The otolaryngologist documents vocal fold swelling and refers the patient for voice therapy. At the start of the therapy episode the speech-language pathologist performs a baseline voice functional limitation assessment to quantify current status using validated measures (e.g., Voice Handicap Index, auditory-perceptual ratings, maximum phonation time, and connected speech assessment). The clinician documents severity and activity/participation limitations, sets measurable functional goals, and records the baseline using billing code G9171. Re-assessments using the same standardized measures occur at regular reporting intervals (for example, every 4–6 weeks or at defined episode milestones) to document change in voice function and to support continued medical necessity for ongoing therapy. Typical workflow includes initial evaluation with otolaryngology findings, baseline functional measurement and treatment planning by the speech-language pathologist, periodic progress reporting using G9171 at established intervals, and discharge summary documenting final status and outcomes.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    92507Treatment of speech, language, voice, communication, and/or auditory-processing disorder; individualCommonly billed for direct voice therapy sessions provided after baseline functional assessment G9171
    92626Evaluation of oral and pharyngeal swallowing function; with instrumentation (eg, fiberoptic), per hourMay be performed when concurrent swallowing assessment is clinically indicated; supports comprehensive laryngopharyngeal evaluation
    31575Laryngoscopy, flexible fiberoptic; diagnosticPerformed by otolaryngologist to visualize vocal folds; often precedes referral for voice therapy and documentation used alongside G9171
    92521Evaluation of speech fluency (e.g., stuttering assessment)Used when coexisting speech fluency issues are assessed during the voice evaluation episode
    92630Evaluation of speech and language or voice, with recording and analysis of speech-sound productionUsed for objective acoustic/physiologic voice assessment tools that supplement functional limitation reporting
    92601Evaluation of speech, language, voice, communication, and/or auditory processing — initial assessmentUsed for comprehensive initial SLP evaluation; baseline measures documented in G9171

    Related Modifiers

    7 rows

    ModifierDescriptionWhen to Use
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    91Modifier 91 — “Repeat Clinical Diagnostic Laboratory Test” — is appended when the exact same CPT laboratory test is performed more than once for the same patient on the same day because serial,…- Use modifier 91 when the exact same CPT laboratory test is performed more than once on the same patient on the same date because serial or repeated testing is medically necessary to monitor…
    95Modifier 95 indicates that a service was provided via synchronous, real‑time audio‑video telehealth rather than in‑person. Per CMS, AAPC and professional associations, append modifier 95 to claim…- Use modifier 95 to indicate a service was furnished via synchronous, real‑time audiovisual telehealth (a live audio‑video conference between patient and provider) rather than in‑person. - Pair…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    251B00000XCase Management AgencyAn organization that is responsible for providing case management services. The agency provides services which assist an individual in gaining access…
    207L00000XAnesthesiology PhysicianAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
    208000000XPediatrics PhysicianA pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectru…
    207R00000XInternal Medicine PhysicianA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
    174MM1900XMedical Research VeterinarianOther Service Providers · Veterinarian
    163WI0500XInfusion Therapy Registered NurseNursing Service Providers · Registered Nurse
    207RN0300XNephrology PhysicianAn internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not fu…
    347E00000XTransportation BrokerAn organization that provides transportation for individuals who need access to medical care or services and have no other means of transportation. Tr…

    Related Codes

    HCPCS-G9490-HOME-ASSESSMENT-NON-HOMEBOUND

    HCPCS G9490: Home Visit Patient Assessment for Non-Homebound Beneficiary

    HCPCS-G0008-INFLUENZA-VACCINE-ADMINISTRATION

    HCPCS G0008: Administration of Influenza Virus Vaccine

    HCPCS-G0009-PNEUMOCOCCAL-VACCINE-ADMINISTRATION

    HCPCS G0009: Administration of Pneumococcal Vaccine

    HCPCS-G0010-HEPATITIS-B-VACCINE-ADMINISTRATION

    HCPCS G0010: Administration of Hepatitis B Vaccine

    HCPCS-G0011-PREP-COUNSELING-HIV-RISK-REDUCTION-ADHERENCE

    HCPCS G0011: Individual PrEP Counseling, HIV Risk Assessment

    HCPCS-G0012-PRE-EXPOSURE-PROPHYLAXIS-INJECTION-HIV-PREVENTION

    HCPCS G0012: Injection of PrEP Drug for HIV Prevention

    HCPCS-G0013-PREP-INDIVIDUAL-COUNSELING-HIV-RISK-REDUCTION

    HCPCS G0013: Individual PrEP Counseling by Clinical Staff

    HCPCS-G0017-PSYCHOTHERAPY-CRISIS-FIRST-60-MINUTES-NON-OFFICE

    HCPCS G0017: Psychotherapy for Crisis, First 60 Minutes

    HCPCS-G0018-PSYCHOTHERAPY-CRISIS-ADDITIONAL-30-MINUTES-NON-OFFICE

    HCPCS G0018: Psychotherapy for Crisis, Additional 30 Minutes

    HCPCS-G0019-COMMUNITY-HEALTH-INTEGRATION-SDOH-CARE-COORDINATION

    HCPCS G0019: Community Health Integration, Person-Centered Assessment

    Showing 1–10 of 1996

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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