CPT® Code 94720

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The Carbon Monoxide Diffusing Capacity test, identified by CPT® Code 94720, is a pulmonary function test that measures the ability of the lungs to transfer carbon monoxide (CO) from the air into the bloodstream. This test is performed by having the patient inhale a specific air mixture that contains a known quantity of carbon monoxide. The amount of CO that is absorbed by the body is then determined by comparing the concentration of CO in the inhaled air with that in the exhaled air. This process provides valuable information about the efficiency of gas exchange in the lungs, which is crucial for diagnosing and monitoring various respiratory conditions. The test is particularly useful in assessing conditions that may affect lung function, such as emphysema, pulmonary fibrosis, and other forms of chronic obstructive pulmonary disease (COPD). Understanding the diffusing capacity of the lungs helps healthcare providers evaluate the severity of lung disease and guide treatment decisions.