Oth fx shaft of unsp ulna, 7thN

This code signifies a complex situation where a patient has experienced a fracture of the ulna shaft, which was initially an open fracture (meaning the skin was broken) of a severe type (IIIA, IIIB, or IIIC). Crucially, the fracture has failed to heal properly, resulting in a nonunion, and the patient is presenting for follow-up care related to this ongoing issue.

Use this code for patients presenting for subsequent treatment of an ulna shaft fracture that was initially an open fracture of Gustilo-Anderson type IIIA, IIIB, or IIIC, and has now been diagnosed with nonunion. This applies to follow-up visits, cast changes, or further surgical planning related to the nonunion, after the initial treatment of the acute fracture.

• Ensure documentation clearly specifies "nonunion" and the initial open fracture type (IIIA, IIIB, or IIIC).
• This code is for subsequent encounters; do not use for the initial treatment of the acute fracture.
• Verify that the fracture location is specifically the shaft of the ulna and not another part of the bone.