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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.
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The Carbon Monoxide Diffusing Capacity test is indicated for various clinical scenarios where assessment of lung function is necessary. The following conditions may warrant the performance of this test:
The procedure for conducting the Carbon Monoxide Diffusing Capacity test involves several key steps to ensure accurate measurement of lung function. The following outlines the procedural steps:
After the Carbon Monoxide Diffusing Capacity test, the patient may be monitored briefly to ensure there are no immediate adverse reactions, particularly since carbon monoxide is a toxic gas. Patients are typically advised to resume normal activities unless otherwise directed by their healthcare provider. Results from the test are analyzed and interpreted by a qualified healthcare professional, who will discuss the findings with the patient and determine any necessary follow-up actions or treatments based on the results.
Short Descr | MONOXIDE DIFFUSING CAPACITY | Medium Descr | CARBON MONOXIDE DIFFW/CAP | Long Descr | Carbon monoxide diffusing capacity (eg, single breath, steady state) | Status Code | Active Code | Global Days | XXX - Global Concept Does Not Apply | PC/TC Indicator (26, TC) | 1 - Diagnostic Tests for Radiology Services | Multiple Procedures (51) | 0 - No payment adjustment rules for multiple procedures apply. | Bilateral Surgery (50) | 0 - 150% payment adjustment for bilateral procedures does NOT apply. | Physician Supervisions | 09 - Concept does not apply. | Assistant Surgeon (80, 82) | 0 - Payment restriction for assistants at surgery applies to this procedure... | Co-Surgeons (62) | 0 - Co-surgeons not permitted for this procedure. | Team Surgery (66) | 0 - Team surgeons not permitted for this procedure. | Diagnostic Imaging Family | 99 - Concept Does Not Apply | APC Status Indicator | Discontinued Code | Type of Service (TOS) | 5 - Diagnostic Laboratory | Berenson-Eggers TOS (BETOS) | none | MUE | Not applicable/unspecified. | CCS Clinical Classification | 233 - Laboratory - Chemistry and Hematology |
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2012-01-01 | Deleted | Deleted. To report see 94729 |
2002-01-01 | Changed | Code description changed. |
Pre-1990 | Added | Code added. |