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    v1.0.28
    OpenPayerBilling CodesPulmonary Diagnostic Testing and TherapiesCPT cpt-94728-airway-resistance-pulmonary-function-sound-wave-testing
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    CPT 94728: Pulmonary Function Test, Airway Resistance Measurement

    Medicare pays $33 on average nationally for this procedure.

    CPT code 94728 describes pulmonary function testing that measures airway resistance using sound waves; this diagnostic respiratory service involves noninvasive assessment of airway mechanics typically performed in a pulmonary function laboratory or outpatient respiratory testing facility and is used to evaluate obstructive or restrictive ventilatory impairment and to guide clinical management based on measured airway resistance.

    For related coverage guidance, see recent payer policy updates: Home Non-Invasive Positive Pressure Ventilation (NIPPV) Devices for Respiratory Insufficiency and Failure, Bronchial Valves, Pulmonary Arterial Hypertension Endothelin Receptor Antagonists.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 55-year-old patient with a history of chronic obstructive pulmonary disease (COPD) and progressive dyspnea is referred to pulmonary function testing to assess airway resistance and monitor response to bronchodilator therapy. The patient arrives at an outpatient pulmonary laboratory where a respiratory therapist explains the test, reviews contraindications (recent eye/ear surgery, active hemoptysis, recent myocardial infarction), and obtains informed consent. Baseline vital signs and bronchodilator withholding instructions are confirmed. The provider orders impulse oscillometry to measure airway resistance and reactance; the patient sits quietly with a mouthpiece and nose clip while tidal breathing is recorded for several breaths. The respiratory therapist ensures proper technique and repeats maneuvers as needed for reproducibility. Results are sent to the ordering pulmonologist for interpretation; findings may prompt medication adjustment, further PFTs (spirometry, lung volumes), imaging, or referral for specialty care. Typical site of service is an outpatient pulmonary function laboratory or hospital outpatient department. The service type is diagnostic pulmonary function testing using oscillometry (airway resistance assessment).

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    94728Pulmonary function testing using sound waves to check airway resistance (impulse oscillometry)Primary procedure measuring airway resistance and reactance
    94010Ventilation assist and management; initiation of pressure support ventilationMay precede or follow PFTs in hospitalized patients requiring ventilatory support assessment
    94060Bronchospasm evaluation: spirometry before and after bronchodilator (qualitative or quantitative)Commonly performed alongside oscillometry to assess reversibility of airflow obstruction
    94070Bronchial provocation testing (methacholine challenge)May be performed when oscillometry or spirometry results are inconclusive for airway hyperresponsiveness
    94729Plethysmography and lung volumes (body plethysmography)Performed to quantify lung volumes and complement airway resistance measurements

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    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…
    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…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    261Q00000XClinic/CenterA facility or distinct part of one used for the diagnosis and treatment of outpatients. "Clinic/Center" is irregularly defined, sometimes being limite…
    207L00000XAnesthesiology PhysicianAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    2278E0002XEmergency Care Certified Respiratory TherapistThe immediate availability of diagnostic and therapeutic cardiopulmonary services in the assessment and management of trauma victims, patients requiri…
    103TH0004XHealth PsychologistA psychologist who specializes in clinical health psychology that investigates and implements clinical services across diverse populations and setting…
    374J00000XDoulaDoulas work in a variety of settings and have been trained to provide physical, emotional, and informational support to a mother before, during, and j…
    1835P1200XPharmacotherapy PharmacistA licensed pharmacist who has demonstrated specialized knowledge and skill in optimizing pharmacotherapeutic care of patients, by developing, implemen…
    226300000XKinesiotherapistA provider trained and educated in the applied science of medically prescribed therapeutic exercise, education and adapted physical activities designe…

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    E11.9Type 2 diabetes mellitus without complications
    E66.9Obesity, unspecified
    I50.9Heart failure, unspecified
    J30.9Allergic rhinitis, unspecified
    J43.9Emphysema, unspecified
    J44.9Chronic obstructive pulmonary disease, unspecified
    J45.40Moderate persistent asthma, uncomplicated
    J45.909Unspecified asthma, uncomplicated
    J68.9Unspecified respiratory condition due to chemicals, gases, fumes and vapors
    J84.10Pulmonary fibrosis, unspecified

    Showing 1–10 of 26

    Related Payer Policy Updates

    Specialty: Pulmonology1 / 2

    10 rows

    PolicyPayerEffective Date
    Home Non-Invasive Positive Pressure Ventilation (NIPPV) Devices for Respiratory Insufficiency and Failureuniverahealthcare2026-10-15
    Bronchial Valvesblue cross blue shield - louisiana2026-09-01
    Pulmonary Arterial Hypertension Endothelin Receptor AntagonistsCigna2026-08-15
    Airway Clearance DevicesCareSource2026-08-01
    Inhaled Nitric Oxide Therapy (for Idaho Only)UnitedHealthcare2026-08-01
    IL-5 Inhibitors (reslizumab, benralizumab, mepolizumab, depemokimab) coverage and site-of-service criteriaPremera Bluecross2026-08-01
    Prior Authorization — Pulmonary Hypertension Agents (PAH, CTEPH, PH-ILD)Colorado Rocky Mountain Health Plans2026-08-01
    Alpha-1 Antitrypsin (AAT) deficiency therapies prior authorizationHealth Alliance Plan (HAP)2026-08-01
    IL-5 Inhibitors (Cinqair, Fasenra, Nucala, Exdensur) coveragePremera Bluecross2026-08-01
    Advanced Therapies for Pharmacological Treatment of Pulmonary Arterial HypertensionPremera Bluecross2026-08-01

    Related Codes

    CPT-94010-DIAGNOSTIC-SPIROMETRY-VITAL-CAPACITY-EXPIRATORY-FLOW

    CPT 94010: Spirometry with Vital Capacity and Expiratory Flow

    CPT-94011-PEDIATRIC-FORCED-EXPIRATORY-FLOW-TEST-INFANTS

    CPT 94011: Infant/Child Forced Expiratory Flow Pulmonary Test

    CPT-94012-PEDIATRIC-FORCED-EXPIRATORY-FLOW-BRONCHODILATION

    CPT 94012: Infant/Child Forced Expiratory Flow with Bronchodilation

    CPT-94013-INFANT-CHILD-PULMONARY-FUNCTION-TEST

    CPT 94013: Pulmonary Function Test for Infant/Child Up to Age 2

    CPT-94014-REMOTE-SPIROMETRY-30-DAY-HOME-MONITORING

    CPT 94014: Home Serial Spirometry Monitoring, 30-Day

    CPT-94015-HOME-SPIROMETRY-30-DAY-TECHNICAL-COMPONENT

    CPT 94015: 30-Day Remote Spirometry, Technical Component

    CPT-94016-HOME-SPIROMETRY-PROFESSIONAL-INTERPRETATION-30-DAY

    CPT 94016: Ambulatory Daily Spirometry, Professional Interpretation

    CPT-94060-SPIROMETRY-BRONCHODILATOR-RESPONSIVENESS-TEST

    CPT 94060: Spirometry with Bronchodilator Response Testing

    CPT-94070-BRONCHIAL-PROVOCATION-TEST-SPIROMETRY

    CPT 94070: Bronchoprovocation with Spirometry

    CPT-94150-TOTAL-VITAL-CAPACITY-MEASUREMENT

    CPT 94150: Total Vital Capacity Measurement

    Showing 1–10 of 48

    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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