Oth fracture of shaft of r humerus, subs for fx w malunion

This code signifies a healed but improperly aligned break in the main body of the right upper arm bone. The bone has united, but the fragments are not in their anatomical position, leading to a deformity or functional impairment. This diagnosis indicates that the patient is receiving ongoing care for this specific complication of a previous fracture.

Apply this code when documenting follow-up care for a patient whose right humeral shaft fracture has healed in a misaligned position. This includes scenarios where the patient is undergoing rehabilitation, physical therapy, or being evaluated for corrective surgery due to the malunion. It is appropriate for any subsequent visit after the initial treatment of the fracture, once malunion has been identified.

• Requires an associated external cause code (V00-Y99) if the malunion is a result of an injury.
• Do not use for nonunion (S42.391N) or routine follow-up of a properly healed fracture.
• Ensure documentation clearly states "malunion" and specifies the "right humerus shaft."