CPT® Code 93308

Echocardiography, transthoracic, real-time with image documentation (2D), includes M-mode recording, when performed, follow-up or limited study

The CPT® Code 93308 refers to a transthoracic echocardiography procedure that is performed to obtain real-time ultrasonic images of the heart and great vessels. This procedure includes two-dimensional (2D) image documentation and may also involve M-mode recording, which is utilized when necessary. Transthoracic echocardiography employs ultrasound technology, which utilizes sound waves that are emitted and then reflected back from internal structures of the body. These sound waves travel at varying speeds depending on the density of the tissues they encounter, allowing for a detailed visualization of the heart's anatomy and function. The reflected sound waves are converted into electrical signals that are displayed as images on a monitor, providing a visual representation of the heart's structure and movement in real time. During the procedure, multiple views are captured using ultrasound transducers placed on the chest, enabling a thorough evaluation of both the left and right heart chambers, the heart valves, the pericardium, and other relevant structures, such as the pulmonary valve and the inferior vena cava. The selective M-mode recording, also referred to as T-M mode, offers precise time-motion information from a stationary ultrasound beam, which is superimposed on the 2D images. In this mode, depth is represented on the vertical axis while time is displayed on the horizontal axis, making it particularly useful for obtaining critical cardiac measurements, such as the thickness of the septal wall and the timing of valve movements. The code 93308 is specifically reported when a follow-up or limited echocardiographic study is conducted, typically focusing on a specific area of clinical concern rather than a comprehensive evaluation of all cardiac structures.