Oth fx third MC bone, left hand, subs for fx w malunion

This code signifies a fracture of the third metacarpal bone in the left hand that has healed in an abnormal position. This malunion indicates that the bone fragments have joined, but the alignment is incorrect, potentially leading to functional impairment or deformity.

Apply this code when a patient presents for follow-up care of a previously diagnosed left third metacarpal fracture that has healed with malunion. This includes scenarios where the malunion is being monitored, or when treatment for the malunion (e.g., corrective surgery planning) is being initiated.

• Ensure documentation clearly specifies "malunion" and the "left hand" for the third metacarpal.
• Verify this is a "subsequent encounter" for the fracture, not the initial treatment.
• Consider additional codes for any associated complications or procedures performed to address the malunion.