CPT® Code 61150

A burr hole or trephine procedure involves creating a small opening in the skull to facilitate the drainage of a brain abscess or cyst. This surgical intervention is critical for addressing conditions where fluid accumulation poses a risk to brain function or health. The procedure begins with an incision in the scalp, which is then flapped forward to provide access to the underlying skull. A burr hole is typically created using a surgical drill or perforator, although a trephine may be employed to remove a small disc of bone. Once the skull is accessed, the dura mater, the protective membrane surrounding the brain, is incised to allow entry into the cranial cavity. To manage any bleeding that may occur during the procedure, electrocautery is utilized. A needle is then carefully inserted and advanced to the site of the abscess or cyst. The capsule of the abscess or cyst is perforated to enable drainage. Following this, the obturator within the needle is removed, and a syringe is attached to facilitate the aspiration of the fluid. After the drainage is complete, the needle is withdrawn, the dura is closed, and the defect in the skull is repaired, either by replacing the bone disc or applying bone wax. This procedure is coded as CPT® 61150 for the initial drainage, while subsequent aspirations are coded as CPT® 61151.