Summary & Overview
CPT 94618: Pulmonary Stress Test with Exercise Component
CPT code 94618 covers pulmonary stress testing that evaluates lung function under exertion, often incorporating a six–minute walk or other exercise challenge. This service is used to diagnose and monitor respiratory conditions such as exercise-induced bronchospasm, interstitial lung disease, pulmonary vascular disease, and chronic obstructive pulmonary disease. Nationally, exercise pulmonary function testing informs clinical management, preoperative risk assessment, and longitudinal disease monitoring.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find benchmark information on utilization patterns and reimbursement considerations across major payers, an explanation of the clinical context for ordering exercise pulmonary tests, and a summary of common billing practices and documentation expectations. The publication also highlights service settings where 94618 is typically performed and the clinical indications that commonly prompt testing.
This summary provides a concise reference for billing, clinical, and policy stakeholders seeking a national overview of how CPT code 94618 is used, where tests are performed, and what topics to review when aligning clinical workflow and billing processes with payer requirements.
Billing Code Overview
CPT code 94618 describes a pulmonary stress test performed to evaluate lung function and to diagnose or assess certain pulmonary disorders. The procedure includes a stress component that may use a six–minute walk test or another form of exercise to assess respiratory response to exertion.
Service type: Diagnostic pulmonary function testing with exercise/stress component
Typical site of service: Outpatient pulmonary function laboratory, hospital outpatient department, or ambulatory clinic
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a history of chronic obstructive pulmonary disease (COPD) and progressive exertional dyspnea is referred by their pulmonologist for pulmonary stress testing to quantify functional capacity and evaluate oxygenation with exertion. The typical workflow begins with a pre-test evaluation that confirms indications and stable baseline vitals, review of recent chest imaging and pulmonary function tests, and documentation of current oxygen therapy. The patient arrives at an outpatient pulmonary function laboratory or hospital pulmonary diagnostics unit. Baseline measurements — including resting spirometry, baseline oxygen saturation, heart rate, and blood pressure — are obtained. The provider selects the appropriate stress method (commonly a six-minute walk test or treadmill/wheelchair-adapted exercise) and explains the procedure. Continuous pulse oximetry and clinical monitoring are maintained during the exercise portion; supplemental oxygen is adjusted per protocol if indicated. Post-exercise measurements are recorded, including distance walked (if six-minute walk), exertional oxygen saturation nadir, heart rate recovery, and any symptoms or adverse events. The provider documents results, interprets functional impairment, and communicates findings to the referring clinician. Typical sites of service include outpatient hospital-based pulmonary function laboratories, ambulatory surgical centers that offer diagnostic testing, or clinic-based pulmonary diagnostic suites.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component |