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    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g9159-spoken-language-comprehension-assessment
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    HCPCS G9159: Spoken Language Comprehension Functional Limitation

    HCPCS Level II code G9159 documents spoken language comprehension functional limitation at the start of a therapy episode and at reporting intervals; it represents a standardized functional assessment service typically performed by speech-language pathology clinicians during speech-language therapy sessions in outpatient therapy clinics, rehabilitation centers, or other therapeutic service sites where functional communication is evaluated and tracked over time.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 68-year-old patient presents to outpatient speech-language pathology for evaluation and treatment after an ischemic stroke affecting the left perisylvian region. Baseline assessment at the outset of the therapy episode documents difficulty understanding spoken language (receptive aphasia) that limits participation in activities of daily living and informed decision-making. The speech-language pathologist administers standardized and criterion-referenced comprehension measures at the start of therapy and at scheduled reporting intervals (for example, every 30 days or at the end of the therapy episode) to document current status and change in spoken language comprehension. The workflow includes initial evaluation, establishment of measurable goals, ongoing treatment sessions targeting auditory comprehension (single-word, sentence, and discourse levels), caregiver training, periodic progress assessments using the same measures, and a discharge summary that reports functional status for spoken language comprehension using the required functional limitation reporting format for G9159.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    92507Treatment of speech, language, voice, communication, and/or auditory processing disorder; individualFrequently provided in sessions that target improvement in spoken language comprehension as part of therapy
    92521Evaluation of speech fluency (e.g., stuttering); initial assessmentMay be used if fluency assessment is relevant to differential diagnosis but not primary for comprehension
    92626Evaluation of auditory processing for speech understanding (central auditory processing evaluation)Used when audiology assessment of processing is performed to distinguish peripheral hearing loss from central comprehension deficits
    96127Brief emotional/behavioral assessment (e.g., depression inventory)May be used adjunctively to monitor mood or affect that can affect therapy participation
    97110Therapeutic exercises to develop strength and endurance, range of motion and flexibilityOccasionally billed by rehabilitation disciplines in a multidisciplinary plan when combined with communication therapy
    G0506Comprehensive assessment of and care planning for patients requiring complex chronic care managementMay be used by the care team for coordination when comprehension deficits significantly impact care planning

    Related Modifiers

    5 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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    103G00000XClinical NeuropsychologistA clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to norma…
    103K00000XBehavior AnalystA behavior analyst is qualified by at least a master's degree and Behavior Analyst Certification Board certification and/or a state-issued credential …
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    133N00000XNutritionistA specialist in adapting and applying food and nutrient knowledge to the solution of food and nutritional problems, the control of disease, and the pr…
    1223S0112XOral and Maxillofacial Surgery (Dentist)The specialty of dentistry which includes the diagnosis, surgical and adjunctive treatment of diseases, injuries and defects involving both the functi…
    1835C0206XCardiology PharmacistA licensed pharmacist who has demonstrated specialized knowledge and skill in direct patient care to ensure safe and effective use of medications in p…
    261QU0200XUrgent Care Clinic/CenterAmbulatory Health Care Facilities · Clinic/Center
    224ZL0004XLow Vision Occupational Therapy AssistantOccupational therapy assistants contribute to the completion of an individualized occupational therapy low-vision evaluation under the direction and s…

    Related ICD-10-CM Codes

    22 rows

    ICD-10-CM CodeDescription
    F80.0Phonological disorder
    F80.1Expressive language disorder
    F80.2Mixed receptive-expressive language disorder
    F80.89Other developmental disorders of speech and language
    F80.9Developmental disorder of speech and language, unspecified
    F81.9Developmental disorder of scholastic skills, unspecified
    F84.0Autistic disorder
    G31.84Mild cognitive impairment of uncertain or unknown etiology
    G31.89Other specified degenerative diseases of nervous system
    G93.49Other encephalopathy

    Showing 1–10 of 22

    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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