Path fx in oth disease, r humerus, subs for fx w nonunion

This code signifies a fracture of the right humerus that occurred due to an underlying disease process, not trauma. The fracture has failed to heal properly, resulting in a nonunion, and the patient is presenting for follow-up care after initial treatment.

Apply this code when documentation indicates a patient is being seen for ongoing management of a right humeral fracture that developed secondary to a systemic condition (e.g., osteoporosis, metastatic cancer), and the fracture has not united. This code is appropriate for subsequent encounters after the initial treatment of the nonunion.

• Requires an additional code to identify the underlying disease causing the pathological fracture.
• Distinguish from malunion (M84.4-) where the fracture has healed but in an unsatisfactory position.
• Ensure documentation clearly specifies "nonunion" and the "right humerus" for accurate coding.