Path fracture, unsp ulna and radius, subs for fx w nonunion

This code signifies a fracture of both the ulna and radius that occurred due to a pre-existing disease or weakened bone, rather than trauma. It specifically indicates that the patient is receiving follow-up care for this pathological fracture, and the fracture has not healed properly (nonunion).

Use this code for patients presenting for ongoing treatment of a pathological ulna and radius fracture where the bone fragments have failed to unite. Documentation should clearly state "pathological fracture," "nonunion," and specify the encounter as subsequent care. This code is appropriate when the initial treatment has failed to achieve healing.

• Ensure documentation explicitly states "pathological fracture" and "nonunion" for both ulna and radius.
• Verify the encounter type is "subsequent" (K) and not initial (A) or sequela (S).
• Always code the underlying disease causing the pathological fracture first, followed by this code.