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

This code signifies a complex fracture involving four distinct fragments of the surgical neck of the left humerus. The "surgical neck" is a common site for humeral fractures, located just below the tubercles. "Nonunion" indicates that the bone fragments have failed to heal together after a significant period.

This code is appropriate for encounters where a patient is receiving ongoing treatment for a previously diagnosed 4-part surgical neck fracture of the left humerus, and the fracture has not united. This includes follow-up visits, cast changes, physical therapy, or preparation for revision surgery due to the nonunion.

• Ensure documentation clearly specifies a 4-part fracture and the left side.
• Verify that the encounter is for subsequent care related to the nonunion, not the initial treatment.
• Confirm that "nonunion" is explicitly documented; if delayed healing is present but not yet nonunion, a different subsequent encounter code would be appropriate.