My osteoporosis specialist will often treat patients who have what he calls "chronic vertebral fractures" caused by osteoporosis. These fractures frequently are very old, but still apparently causing the patient pain. The patient is coming in to receive a Prolia injection and I need an osteoporosis diagnosis code to be the primary code for the Prolia injection. Can I code this situation with M81.8, M54.5 and M8088XS, since the pain is a sequela of the fracture, even though the fracture is not technically current? Or would I just use the M80.88XS as the primary code just on the injection?