Oth fx low end unsp ulna, 7thR

This code signifies a subsequent encounter for an open fracture of the distal ulna, specifically involving a Type IIIA, IIIB, or IIIC open fracture that has healed with malunion. It indicates that the bone has united, but in an anatomically incorrect or deformed position.

Use this code when a patient presents for follow-up care of a previously treated open distal ulna fracture (Gustilo-Anderson Type IIIA, IIIB, or IIIC) and clinical or radiographic findings confirm malunion. This code is appropriate for ongoing management of the malunion, such as planning for corrective osteotomy or addressing functional limitations.

• Ensure documentation clearly specifies "malunion" and the Gustilo-Anderson open fracture type.
• Verify this is a "subsequent encounter" and not an initial treatment for the malunion.
• Code any associated complications or sequelae of the malunion separately.