Displ seg fx shaft of humer, l arm, subs for fx w nonunion

This code describes a situation where a patient has a fracture in the middle part of their left upper arm bone (humerus) that is broken into multiple pieces and is no longer aligned. Crucially, the bone has failed to heal properly after an initial treatment, and the patient is now receiving ongoing care for this persistent nonunion.

Use this code for follow-up encounters when a patient with a previously treated segmental fracture of the left humeral shaft presents with evidence of nonunion. This includes visits for continued management, evaluation of nonunion, or planning for further interventions such as bone grafting or revision surgery to promote healing.

• Ensure documentation clearly specifies "nonunion" and the "subsequent encounter" for the fracture.
• Verify the fracture is segmental and located in the shaft of the humerus, and on the left side.
• Do not use this code for initial treatment of the fracture or for malunion (improperly healed fracture).