Summary & Overview
CPT 94690: Expired Air Collection and Respiratory Analysis
CPT code 94690 covers collection and laboratory analysis of expired air to evaluate a patient’s respiratory status, including assessments for bronchial allergy or hypersensitivity, bacterial lung infections, and pulmonary tumors. As a specific laboratory diagnostic procedure, it informs clinical decisions about respiratory disease management and may impact care pathways for patients with suspected infectious, allergic, or neoplastic pulmonary conditions. Nationally, standardized coding for such tests supports claims processing, quality measurement, and comparisons across payers and settings.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for use of the code, typical sites of service, common billing modifiers, and practical coding considerations relevant to payer adjudication. The publication also summarizes benchmarks and policy updates where available and clarifies related coding relationships.
This resource is intended to help billing managers, clinical coders, and policy analysts understand when CPT code 94690 applies, how it fits into diagnostic workflows, and what to expect from payer coverage perspectives at a national level. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 94690 describes collection and laboratory analysis of a patient’s expired air to assess respiratory status. The test evaluates respiratory function and may be used in workups for bronchial allergy or hypersensitivity, bacterial lung infections, or pulmonary tumors.
Service Type: Laboratory respiratory diagnostic test involving expired air collection and analysis
Typical Site of Service: Clinical laboratory or hospital outpatient laboratory setting
Clinical & Coding Specifications
Clinical Context
A 46-year-old patient with chronic cough and intermittent wheeze is referred to a pulmonary laboratory for assessment of airway hyperresponsiveness. The referring pulmonologist documents suspected bronchial hypersensitivity and recurrent lower respiratory infections. In the outpatient pulmonary function laboratory, a respiratory therapist prepares the patient, explains the procedure, and collects baseline spirometry. The provider administers the controlled bronchoprovocation challenge or collects expired air samples in a monitored laboratory setting using standardized equipment to measure markers of airway reactivity and respiratory status. Continuous monitoring of oxygen saturation and clinical signs is performed. Results are analyzed by the provider to evaluate bronchial allergy, hypersensitivity, infectious contribution, or neoplastic processes affecting ventilation. The laboratory documents indications, consent, test protocol, medications withheld prior to testing, patient tolerance, and numeric test results in the medical record for the pulmonologist and ordering provider to interpret and include in the treatment plan.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the physician interpretation of test data separate from the technical performance. |
TC |