Hi Guest! CPT 21248 stands for: Reconstruction of mandible or maxilla, endosteal implant (eg, blade, cylinder); partial(3 or less) CPT 41870 stands for: Periodontal mucosal graft If both services need to be done, you will want to pre-auth both codes! If it is just the implants, then you”re looking at 21248 for the pre-auth. Hope this helps!