CPT® Code 0742T

Add-On Code

Absolute quantitation of myocardial blood flow (AQMBF), single-photon emission computed tomography (SPECT), with exercise or pharmacologic stress, and at rest, when performed (List separately in addition to code for primary procedure)

Absolute quantitation of myocardial blood flow (AQMBF) is a diagnostic procedure that utilizes single-photon emission computed tomography (SPECT) to assess blood flow to the heart muscle. This technique is particularly valuable in diagnosing and monitoring coronary artery disease, as well as evaluating the severity of microvascular disease and the effectiveness of treatment interventions. The procedure begins with the establishment of intravenous access, followed by the placement of electrocardiogram (ECG) leads and a blood pressure cuff on the patient's arm. The patient is positioned flat on a table in the procedure room, where myocardial perfusion imaging is conducted either at rest or under stress. Stress can be induced through physical exercise, such as walking on a treadmill or pedaling on a stationary bike, or through the administration of a pharmacologic agent via intravenous injection. During the procedure, a radionuclide tracer is injected, which allows for the imaging of the myocardium. Healthy heart tissue absorbs the radionuclide, while ischemic areas do not, providing critical information about blood flow. The imaging data is processed using dedicated software, which analyzes the images and generates a polar map that illustrates the relative perfusion of the coronary arterial beds and myocardial tissue. The output includes numerical data reflecting blood flow in milliliters per gram per minute (mL/g/min) at both rest and stress conditions. This AQMBF data is then integrated with static perfusion imaging results to create a comprehensive report. It is important to note that CPT® Code 0742T is reported separately in addition to the code for the primary SPECT procedure, highlighting its role as an adjunctive measure in the overall assessment of myocardial perfusion.