There is no specified CPT code for D6059 abutment supported PFM or D6057 custom fabricated abutment as these are considered the prosthetic phase of an implant service and should be billed to dental. According to utilization review medical carriers are only covering the surgical phase of an implant using CPT code 21248-21249.
You may try an unlisted code of 21299 and submit a short narrative along with the claim for possible reimbursement.