CPT® Code 95829

Electrocorticogram (ECoG) is a specialized form of electroencephalogram (EEG) that is conducted directly on the exposed surface of the cerebral cortex during a surgical procedure. This technique is particularly valuable in neurosurgery as it enables the identification of critical areas within the sensory cortex. The primary purpose of performing an ECoG is to assist the surgeon in delineating the boundaries of a surgical resection, especially in cases involving neoplasms, brain injuries, or epilepsy. In patients with epilepsy, ECoG is instrumental in locating the epileptogenic regions that are targeted for resection. The procedure involves the placement of ECoG electrodes on the brain, which can be positioned either on the outer layer of the dura mater (epidural) or beneath it (subdural). The configuration of these electrodes can vary, being arranged in arrays, strips, or grids, depending on the findings from preoperative EEGs and imaging studies that are conducted separately. Throughout the surgical procedure, brain activity is continuously monitored, and a comprehensive written report detailing the intraoperative ECoG findings is generated to document the results and assist in postoperative care and decision-making.