Pathological fracture, unsp humerus, subs for fx w nonunion

This code signifies a fracture of the humerus that occurred due to an underlying disease process, rather than trauma, and is currently in a stage of nonunion. Nonunion indicates that the fracture has failed to heal completely after a reasonable period, and the patient is receiving ongoing treatment for this complication. The specific location of the humerus fracture is not documented.

Use this code for patients presenting for follow-up care, cast changes, medication management, or other treatments related to a previously diagnosed pathological humerus fracture that has not healed. Documentation should clearly state "pathological fracture," "humerus," and "nonunion," along with an indication that this is a subsequent encounter for the fracture. This code is appropriate when the specific part of the humerus (e.g., shaft, distal, proximal) is not specified.

• Always sequence this code after the underlying disease causing the pathological fracture (e.g., osteoporosis, neoplasm).
• Distinguish carefully between nonunion (K) and malunion (P) or routine healing (D) for subsequent encounters.
• Ensure documentation explicitly states "unspecified humerus" if a more specific site is not provided, otherwise, a more precise code should be used.