Summary & Overview
HCPCS G8924: Spirometry Results Documented (FEV1/FVC < 70%)
HCPCS Level II code G8924 denotes documentation of spirometry with an obstructive pattern (FEV1/FVC < 70%). This code captures the clinical finding resulting from pulmonary function testing and is relevant to clinicians and payers managing obstructive lung disease diagnosis and follow-up. Nationally, consistent documentation of spirometry results supports clinical decision-making, quality measurement, and appropriate billing for respiratory care services. Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn what G8924 represents, the typical clinical context and site of service, and how the code is used in documentation workflows. The publication outlines benchmarking and reporting considerations for payers and providers, summarizes common modifiers associated with outpatient testing, and situates the code within pulmonary diagnostic services. It also highlights policy and billing nuances pertinent to national payers and explains what data elements are commonly expected when G8924 is reported. Data not available in the input for some fields is noted where applicable.
Billing Code Overview
HCPCS Level II code G8924 indicates spirometry results documented with FEV1/FVC < 70%. This code represents documentation that a diagnostic spirometry test demonstrated an obstructive pattern, defined by a ratio of forced expiratory volume in one second to forced vital capacity below 70%.
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Service type: Pulmonary function testing interpretation/documentation of spirometry results
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Typical site of service: Outpatient clinic or pulmonary function laboratory where spirometry testing is performed
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with a 40-pack-year smoking history presents to an outpatient pulmonary function laboratory for evaluation of chronic cough and exertional dyspnea. Primary care or pulmonary clinic orders spirometry with bronchodilator testing. The technologist performs pre- and post-bronchodilator spirometry, documents FEV1, FVC, and FEV1/FVC ratio. Results show an obstructive pattern with FEV1/FVC < 70%, consistent with airway obstruction. The pulmonary clinician reviews the tracings and interpretation, correlates with clinical history and prior imaging, documents the spirometry results in the chart, and assigns appropriate diagnosis codes for obstructive lung disease. Typical workflow includes patient check-in, pre-test screening (contraindications, recent procedures), coaching and repeatable effort measurements by trained personnel, bronchodilator administration if indicated, clinician review and documentation, and transmission of results to the referring provider. Typical sites of service include outpatient pulmonary function laboratories, hospital outpatient departments, ambulatory clinics, and physician offices equipped for spirometry.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required to document or interpret spirometry is substantially greater than typical (rare for routine spirometry). |