4-part fx surgical neck of l humerus, subs for fx w malunion

This code signifies a complex fracture involving four distinct fragments of the surgical neck of the left humerus. It specifically indicates that the patient is in a subsequent phase of care, and the fracture has healed in an anatomically incorrect or misaligned position. This malunion can lead to functional impairment and pain.

Apply this code when documenting follow-up care for a patient with a previously treated 4-part surgical neck fracture of the left humerus who presents with evidence of malunion. This includes scenarios where the malunion is being monitored, or the patient is undergoing treatment (e.g., physical therapy, surgical correction) for the consequences of the malunion.

• Ensure documentation clearly specifies "left" humerus and "4-part" fracture.
• Confirm the encounter is for subsequent care and explicitly mentions "malunion."
• Do not use for initial encounters or for nonunion, which is a separate condition.