ICD-10-CM > M00-M99 > M26-M27 > M27 > M27.5 M27.5 Periradicular pathology associated with previous endodontic treatment Non-Billable/Non-Specific Codes M27.51Perforation of root canal space due to endodontic treatmentM27.52Endodontic overfillM27.53Endodontic underfillM27.59Other periradicular pathology associated with previous endodontic treatment