CPT® Code 93890

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A transcranial Doppler study, specifically identified by CPT® Code 93890, is a non-invasive diagnostic procedure utilized to assess the vasoreactivity of the intracranial arteries. This study is particularly significant for patients with established cerebrovascular diseases affecting the carotid and/or vertebrobasilar arteries. The primary objective of the transcranial Doppler study is to evaluate the cerebrovascular reserve capacity, which is the ability of the brain's blood vessels to increase blood flow in response to various physiological challenges. Such evaluations are crucial, especially in preoperative settings where understanding blood flow dynamics is essential for surgical planning. The vasoreactivity study measures the variations in intracranial blood flow velocity that occur due to changes in carbon dioxide levels, which can be induced by inhaling a gas mixture with elevated carbon dioxide content, breath-holding, or hyperventilation. Additionally, the study may involve the administration of pharmacological agents, such as acetazolamide, to further assess the brain's blood flow response. During the procedure, a gel is applied to the patient's skin, and a hand-held Doppler probe is strategically placed over the middle cerebral arteries (MCAs) on both sides of the head. Continuous monitoring of blood flow velocity is conducted during a resting phase and subsequent to the physiological challenges, allowing for a comprehensive analysis of the cerebrovascular response. The results are processed through a computer program that calculates the changes in blood flow from baseline levels, and the physician subsequently reviews these findings to generate a detailed report. This report includes critical insights into the adequacy of collateral blood flow channels, which are vital for maintaining cerebral perfusion in the event of a stroke or during procedures that may temporarily disrupt blood flow to the brain.