CPT® Code 61533

The CPT® Code 61533 refers to a surgical procedure known as a craniotomy with elevation of a bone flap specifically for the subdural implantation of an electrode array, which is utilized for long-term seizure monitoring. This procedure involves the careful opening of the skull to access the brain's surface, allowing for the placement of an electrode array that consists of multiple rows of electrodes arranged in a square grid. These electrodes are crucial for monitoring electrical activity in the brain over an extended period, which is essential for diagnosing and managing seizure disorders. The procedure begins with an incision in the scalp, followed by the creation of burr holes in the skull. A section of bone, known as a bone flap, is then elevated to provide access to the dura mater, the protective covering of the brain. Once the dura is opened, the electrode array is positioned in the subdural space and tested to ensure proper functionality. After securing the electrode array, the dura is closed, and the bone flap is replaced and secured, followed by layered closure of the scalp. This meticulous approach ensures that the electrodes remain in place for effective long-term monitoring of seizure activity, providing valuable data for the management of epilepsy and other seizure-related conditions.