Disp fx of nk of 5th MC bone, r hand, subs for fx w nonunion

This diagnosis code indicates a break in the neck of the fifth metacarpal bone in the right hand, which is out of its normal alignment. The fracture has failed to heal properly, resulting in a nonunion. This code is used when the patient is receiving follow-up care for this specific complication.

Apply this code for patients presenting for ongoing treatment of a previously diagnosed, displaced fracture of the right fifth metacarpal neck that has developed into a nonunion. This includes visits for evaluation of nonunion, planning for surgical intervention to address the nonunion, or conservative management of the established nonunion. It is appropriate for any encounter after the initial treatment phase where nonunion is the primary focus.

• Requires an associated external cause code if the cause of the fracture is known and relevant to the encounter.
• Do not use for initial treatment of the fracture or for routine follow-up of a healing fracture.
• Ensure documentation clearly states "nonunion" and specifies the right fifth metacarpal neck with displacement.