Can anyone explain the rationale for the use of ASA code 01484 instead of 01480 for the IM nailing of a tibia fx? The CPT procedure code 27759 crosswalks to code 01484, which is for an osteotomy or osteoplasty. I can't understand why this code is used instead of just the code for open treatment of bones of the lower leg. Any help would be greatly appreciated.