CPT® Code 61531

The procedure described by CPT® Code 61531 involves the subdural implantation of strip electrodes for the purpose of long-term seizure monitoring. This technique is utilized to gather critical data regarding the electrical activity of the brain, particularly in patients who experience seizures. The strip electrodes, which consist of a single row of electrodes, are strategically placed in the subdural space through one or more burr or trephine holes. The process begins with an incision in the scalp, which is then flapped forward to provide access to the underlying structures. A burr hole is created using a surgical drill or perforator, or alternatively, a small disc of bone may be removed using a trephine. Once access to the subdural space is achieved, the dura mater, which is the outermost layer of the meninges surrounding the brain, is incised. To manage any bleeding that may occur during the procedure, electrocautery is employed. After the strip electrode is inserted into the subdural region, it is tested to confirm its proper functioning. Following the successful placement and testing of the electrode, the dura is closed, and the skull defect is repaired by either replacing the bone disc or applying bone wax. This procedure may be repeated at each site where a strip electrode is implanted, allowing for comprehensive monitoring of seizure activity over an extended period.