Unsp fx fifth MC bone, left hand, subs for fx w malunion

This code signifies a previously sustained, unspecified fracture of the fifth metacarpal bone in the left hand that is now presenting with malunion. Malunion indicates that the fracture has healed, but in an unsatisfactory or deformed position, which may lead to functional impairment.

Apply this code when a patient presents for follow-up care of a left fifth metacarpal fracture that has healed incorrectly. This typically occurs during post-operative visits or follow-up appointments where imaging confirms a malaligned union of the bone.

• Ensure documentation clearly specifies "malunion" and not nonunion or delayed union, as these have different codes.
• Verify the laterality (left hand) and the specific bone (fifth metacarpal) are accurately documented.
• This code is for subsequent encounters; an initial encounter for the fracture would use a different code.