Nondisp transverse fx shaft of unsp ulna, 7thN

This code signifies a transverse fracture of the shaft of the ulna that was initially an open fracture (Type IIIA, IIIB, or IIIC) and has subsequently failed to heal properly, resulting in a nonunion. The fracture itself is nondisplaced, meaning the bone fragments are still in their anatomical alignment despite the lack of complete healing.

Use this code for follow-up encounters where a patient is being treated for a previously diagnosed open transverse ulnar shaft fracture that has not united. This applies when the original injury was classified as a severe open fracture (Gustilo-Anderson Type IIIA, IIIB, or IIIC) and the current assessment confirms nonunion.

• Ensure documentation clearly specifies "nonunion" and the original open fracture type (IIIA, IIIB, or IIIC).
• Verify the fracture is of the ulnar shaft and is transverse and nondisplaced.
• This code is for subsequent encounters; an initial encounter would use a different code.