Oth fx shaft of left ulna, subs for clos fx w malunion

This code signifies a fracture of the shaft of the left ulna, excluding specific types like Monteggia or Galeazzi, that is currently in the healing phase following initial treatment. The key characteristic is that the bone has healed, but in an anatomically incorrect or misaligned position, known as malunion.

This code is appropriate for follow-up encounters where a patient is being managed for a previously treated closed fracture of the left ulnar shaft that has healed with malunion. This could include assessment for functional deficits, pain management related to the malunion, or planning for corrective procedures.

• Ensure documentation clearly specifies "malunion" and that the fracture is of the ulnar shaft, not the distal or proximal end.
• Verify the encounter is for follow-up care after initial treatment, not the initial injury or active treatment of an acute fracture.
• Confirm the laterality is "left" and the fracture was "closed" at the time of injury.