CPT® Code 93898

Venous-arterial shunt detection with intravenous microbubble injection performed with transcranial Doppler study of intracranial arteries, complete (List separately in addition to code for primary procedure)

The CPT® Code 93898 refers to a specialized diagnostic procedure known as venous-arterial shunt detection, which is performed using intravenous microbubble injection in conjunction with a complete transcranial Doppler study of the intracranial arteries. This procedure is particularly significant in identifying right-to-left shunts, which are often associated with conditions such as cryptogenic acute ischemic stroke, a type of stroke that occurs without a clear cause, especially in younger patients under the age of 55. The process involves the rapid injection of agitated saline as a contrast agent, allowing for enhanced visualization of blood flow dynamics within the brain's vascular system. During the procedure, a handheld Doppler probe is utilized to continuously monitor and record the blood flow in the intracranial arteries, with the data being captured on a computer system that provides both auditory and visual feedback. The physician meticulously analyzes the Doppler spectral waveforms, assessing flow direction, velocity, and pulsatility index values, while also identifying any high-intensity transient embolic signals that may indicate the presence of a shunt. The results of this comprehensive evaluation are documented in a detailed report, which includes interpretations of the findings and any notable observations regarding the embolic signals detected during the procedure.