4-part fx surg neck of unsp humerus, subs for fx w nonunion

This code signifies a complex fracture involving four distinct fragments of the surgical neck of the humerus, the bone in the upper arm. "Nonunion" indicates that the fractured bone segments have failed to heal together after an initial attempt at treatment. This specific code is used when the patient is receiving ongoing care for this unhealed fracture.

This code is appropriate for follow-up encounters where a patient is being managed for a previously diagnosed 4-part surgical neck humerus fracture that has not united. This includes visits for continued conservative management, assessment for surgical intervention to promote healing (e.g., bone grafting, revision fixation), or monitoring of the nonunion.

• Ensure documentation clearly states "nonunion" and specifies a 4-part fracture of the surgical neck.
• Verify laterality (left, right, or unspecified) is accurately reflected in the full code.
• This code is for subsequent encounters; an initial encounter would use a different 7th character.