Displ transverse fx shaft of unsp ulna, 7thN

This code signifies a transverse fracture located in the shaft of the ulna, where the bone fragments are no longer in their normal alignment. It specifically indicates a subsequent encounter for a severe open fracture (Type IIIA, IIIB, or IIIC) that has failed to heal properly, resulting in a nonunion. The affected ulna is not specified as left or right.

Apply this code when documenting follow-up care for a patient with a previously treated, severe open transverse ulnar shaft fracture that has developed a nonunion. This is appropriate for encounters where the focus is on managing the persistent nonunion, such as planning for revision surgery, monitoring bone graft healing, or assessing ongoing conservative management.

• Ensure documentation clearly specifies "nonunion" and that the initial injury was a severe open fracture type IIIA, IIIB, or IIIC.
• Verify that the encounter is subsequent to the initial fracture treatment, not the initial injury itself.
• Confirm that the fracture is of the ulna shaft and is transverse and displaced, with the laterality unspecified.