CPT® Code 95965

Magnetoencephalography (MEG), recording and analysis; for spontaneous brain magnetic activity (eg, epileptic cerebral cortex localization)

Magnetoencephalography (MEG) is a sophisticated, noninvasive diagnostic technique utilized to assess and analyze abnormal brain function. This method is particularly valuable in the context of various neurological disorders, as it provides critical insights into brain activity. MEG is often employed alongside other diagnostic studies, such as electroencephalograms (EEG) and magnetic resonance imaging (MRI), to enhance the evaluation of brain disorders. The primary application of MEG includes the localization of epileptic foci, which is essential prior to surgical interventions aimed at treating epilepsy. Additionally, MEG is instrumental in identifying eloquent cortical areas of the brain—regions responsible for critical functions such as sensory processing, motor control, language, and vision—before surgical procedures for brain tumors or arteriovenous malformations. The technology behind MEG involves the use of a multichannel superconducting quantum interference device (SQUID) biomagnetometer system, which is designed to detect and measure the magnetic fields produced by neuronal activity in the brain. This system is equipped with over 100 sensors strategically placed on the scalp to capture the magnetic fields associated with brain activity. Once the magnetic field data is recorded, it is meticulously mapped to pinpoint the locations of epileptic foci or eloquent cortical regions. This mapping process is further refined by overlaying the MEG data onto MRI studies of the brain, allowing for precise localization of the areas of interest. Following the recording and analysis, the physician conducts a thorough review of the MEG findings and generates a comprehensive written interpretation, which is crucial for guiding subsequent clinical decisions and interventions.