Hi guest! The CPT code they gave you for the perio services, 41899 stands for: Unlisted procedure, dentoalveolar structures So the office will need to supply you with a narrative report/operative report to describe the procedure since it is an “unlisted/miscellaneous” code. As for the the bone graft: 21210 – Graft, bone; nasal, maxillary or malar areas (includes obtaining graft) or 21215 – Graft, bone; mandible (includes obtaining graft) Since it is tooth 30, looks like the 21215 would be the proper code. Also, you will want to use modifier -52 for reduced services if the bone is not obtained from the patient. Hope this helps, have a great day!