CPT code 94014 covers a 30-day, patient-performed spirometry service that includes daily timed spirometric measurements, tracings, data transmission and analysis, and clinician review and interpretation. Nationally, this code reflects growing use of remote pulmonary function monitoring for chronic respiratory conditions, enabling longitudinal assessment outside traditional clinic visits and supporting care management and telehealth workflows. Key payers in scope include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. This publication provides benchmarks and practical policy context for billing and reimbursement, explains the clinical workflow and site-of-service considerations, and summarizes payer coverage patterns where available. Readers will find: concise description of the service captured by CPT code 94014; expected clinical settings and technology components; common modifiers and billing considerations; and implications for practice operations and documentation. Data not available in the input is noted where applicable.