Oth fx shaft of unsp ulna, subs for clos fx w nonunion

This code signifies a fracture of the main part (shaft) of the ulna, where the specific side (left or right) is not documented. It indicates that the patient is returning for follow-up care for this closed fracture, and the fracture has failed to heal properly (nonunion).

Apply this code when a patient presents for ongoing management of an ulnar shaft fracture that has not united, and the medical record does not specify which ulna is affected. This is appropriate for subsequent visits after the initial treatment, where nonunion is the primary concern.

• Ensure documentation clearly states "nonunion" for a closed ulnar shaft fracture.
• Only use this code when the laterality (left/right) of the ulna is not specified in the medical record.
• Verify that this is a subsequent encounter, not the initial treatment for the fracture.