billing code D6793: provisional retainer crown Retainer crown utilized as an interim of at least six months duration during restorative treatment to allow adequate time for healing or completion of other procedures. This is not to be used as a temporary retainer crown for routine prosthetic fixed partial dentures. ISBN:1935201387#CDT 2011-2012 Current Dental Terminology, Chapter 1 provisional retainer crown D6793 billing code for fixed partial denture retainers - crowns