The 3rd character refers to the root operation or the objective of the procedure.


  • XRG - Fusion

    Joining together portions of an articular body part rendering the articular body part immobile

  • XRH - Insertion

    Putting in a nonbiological appliance that monitors, assists, performs, or prevents a physiological function but does not physically take the place of a body part

  • XRR - Replacement

    Putting in or on biological or synthetic material that physically takes the place and/or function of all or a portion of a body part