Unsp fx shaft of humerus, unsp arm, subs for fx w malunion

This code indicates a fracture of the main body (shaft) of the humerus, where the specific location on the shaft or the arm affected is not documented. It signifies that the patient is presenting for follow-up care of this fracture, and the bone has healed in an abnormal position or alignment (malunion).

This code is appropriate for encounters where a patient is being treated for complications arising from a previously sustained, unspecified humeral shaft fracture that has healed improperly. This could include assessments for pain, functional limitations, or planning for corrective surgery due to the malunion. It is used when the initial fracture site or laterality was not specified in prior documentation.

• Ensure documentation clearly states "malunion" as a complication of the fracture.
• Only use this code for subsequent encounters; an initial encounter would use a different seventh character.
• Avoid this code if the specific location of the shaft fracture (e.g., proximal, distal, midshaft) or the affected arm (left/right) is known.