CPT® Code 63173

An intramedullary cyst or syrinx is a rare type of lesion characterized by a fluid-filled cavity located within the spinal cord. This condition can lead to various neurological symptoms depending on its size and location. The procedure described by CPT® Code 63173 involves a laminectomy, which is a surgical operation that entails the removal of a portion of the lamina, the bony arch of the vertebra that covers the spinal canal. The surgery is performed through an incision in the skin over the cervical, thoracic, or thoracolumbar region, where the cyst or syrinx is situated. The incision is extended down to the spinous processes to provide adequate access to the affected area. During the procedure, muscles are retracted to expose the lamina and facet joint, allowing the surgeon to utilize a bone drill to remove part or all of the lamina. This exposure enables the surgeon to evaluate the spinal cord and the cyst or syrinx directly. The lesion is then incised and drained, with a drain being placed into the cyst or syrinx to facilitate the removal of fluid. In this specific procedure, the drain is tunneled to exit into the peritoneal or pleural cavity, which is a significant distinction from similar procedures where the drain may terminate in the subarachnoid space. The peritoneum or pleura is incised to allow for the placement of the drain, which is then secured before the surgical incisions are closed. This procedure aims to alleviate symptoms associated with the cyst or syrinx and prevent further complications related to the condition.