CPT® Code 95966

Magnetoencephalography (MEG), recording and analysis; for evoked magnetic fields, single modality (eg, sensory, motor, language, or visual 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 and is often employed alongside other diagnostic studies, such as electroencephalograms (EEG) and magnetic resonance imaging (MRI), to provide a comprehensive evaluation of brain health. MEG is instrumental in localizing epileptic foci, which are critical areas of the brain responsible for seizure activity, prior to surgical interventions. Additionally, it aids in identifying eloquent cortical areas—regions of the brain that control essential functions such as sensory perception, motor skills, language, and visual processing—before surgeries aimed at treating brain tumors or arteriovenous malformations. The technology behind MEG involves the use of a multichannel superconducting quantum interference device (SQUID) biomagnetometer system, which is equipped with over 100 sensors strategically placed on the scalp. These sensors detect and measure the magnetic fields produced by neuronal activity within the brain. The recorded magnetic field data is meticulously mapped to pinpoint the locations of epileptic foci or eloquent cortical regions. This mapping process is further enhanced by overlaying the MEG data onto MRI images, allowing for precise localization of the areas of interest. Following the procedure, a physician reviews the MEG recordings and mappings, providing a detailed written interpretation of the findings, which is crucial for guiding subsequent treatment decisions.