billing code D3221: pulpal debridement, primary and permanent teeth D3221 Pulpal debridement for the relief of acute pain prior to conventional root canal therapy. This procedure is not to be used when endodontic treatment is completed on the same day. ISBN:1935201387#CDT 2011-2012 Current Dental Terminology, Chapter 1 pulpal debridement, primary and permanent teeth billing code for pulpotomy