D3310 : Endodontic therapy, anterior tooth (excluding final restoration)
D3320 : Endodontic therapy, bicuspid tooth (excluding final restoration)
D3330 : Endodontic therapy, molar (excluding final restoration)
D3331 : Treatment of root canal obstruction; non-surgical access
D3332 : Incomplete endodontic therapy; inoperable, unrestorable or fractured tooth
D3333 : Internal root repair of perforation defects
D3346 : Retreatment of previous root canal therapy - anterior
D3347: Retreatment of previous root canal therapy - bicuspid
D3348: Retreatment of previous root canal therapy - molar
