Displaced segmental fx shaft of humerus, unsp arm, sequela

This code signifies a long-term complication or late effect arising from a displaced segmental fracture of the humeral shaft. The fracture involved a segment of bone completely separated from the main shaft, and its fragments were not in proper alignment at the time of the initial injury. This code is used when the specific arm (left or right) is not documented.

Apply this code when a patient presents for treatment of a condition directly resulting from a previously sustained displaced segmental humerus shaft fracture, such as chronic pain, nonunion, malunion, or nerve damage. This code is appropriate for follow-up encounters occurring after the initial healing phase of the fracture.

• Always sequence this "sequela" code after the code for the specific complication being treated (e.g., M84.321A for nonunion).
• Ensure documentation clearly links the current condition to the prior segmental humerus shaft fracture.
• Verify that the arm laterality is truly unspecified in the medical record before assigning this code.