Problem: Sam Suppers is a 56-year old male who is seen today with a herniated disk in his lumbar back. He has tried conservative treatment without success and presents today for a spinal fusion. The patient is taken to the OR, ?prepped, draped, anesthetized and an open posterior spinal fusion of the posterior column at L4-L5 ?using allograft bone grafting material was performed. The patient tolerated procedure well and was transferred to recovery in stable condition. What is the ICD-10-PCS code? Need Assignment Help?