billing code for apicoectomy/periradicular services apicoectomy/periradicular services Periradicular surgery is a term used to describe surgery to the root surface (e.g., apicoectomy), repair of a root perforation or resorptive defect, exploratory curettage to look for root fractures, removal of extruded filling materials or instruments, removal of broken root fragments, sealing of accessory canals, etc. This does not include retrograde filling material placement. ISBN:1935201387#CDT 2011-2012 Current Dental Terminology, Chapter 1 billing code for endodontics