CPT® Code 94013

Measurement of lung volumes (ie, functional residual capacity [FRC], forced vital capacity [FVC], and expiratory reserve volume [ERV]) in an infant or child through 2 years of age

The CPT® Code 94013 pertains to the measurement of lung volumes in infants and children up to 2 years of age. This procedure is essential for assessing pulmonary function, particularly in young patients who cannot perform the necessary breathing exercises voluntarily. Lung volume measurements include key parameters such as functional residual capacity (FRC), forced vital capacity (FVC), and expiratory reserve volume (ERV). Due to the unique challenges presented by this age group, specialized techniques and equipment are employed to ensure accurate results. The process typically involves administering a medication to induce sleep in the infant or child, allowing for a more controlled environment for testing. Once the patient is asleep, a spirometry device is utilized, which includes a mouthpiece and tubing connected to a machine that records and displays the lung volume data. The functional residual capacity is specifically measured to determine the volume of air remaining in the lungs after a normal expiration, reflecting the lungs' capacity when the respiratory muscles are relaxed. Other tests may involve the use of a chest compression jacket, which aids in expanding the lungs to their maximum capacity, allowing for the measurement of forced vital capacity and residual volume. The results from these tests are graphically displayed and subsequently interpreted by the physician, who provides a comprehensive report on the findings.