Oth fx lower end of left ulna, subs for clos fx w malunion

This code signifies a fracture of the lower portion of the left ulna, excluding common types like Colles' or Smith's, that is currently undergoing treatment for a complication where the bone has healed in an incorrect anatomical alignment. This malunion is observed during a follow-up visit for a previously treated closed fracture.

Apply this code when a patient presents for ongoing care of a left ulnar fracture, specifically at its lower end, and imaging or clinical assessment confirms that the bone has healed improperly (malunion). This is appropriate for subsequent encounters after the initial treatment of the closed fracture.

• Ensure documentation clearly specifies "left ulna" and "lower end" of the bone.
• Verify that the encounter is for a "subsequent" visit and the fracture was initially "closed."
• Confirm that "malunion" is explicitly documented as the complication being addressed.