I am stumped on this one. Patient had a remote hemiarthroplasty of the hip, femoral component only. Now has suffered a fracture of the distal femur. Surgeon exchanges the femoral component for one with a shorter stem, then repairs the distal femur fracture. What code do I use for the exchange of the femoral component? I find lots of codes for total hip but the acetabulum has not been "touched" on this patient. Hope you can help.