Oth fx low end unsp ulna, 7thM

This code signifies a fracture of the lower portion of the ulna where the specific location is not documented, and the bone has failed to heal properly (nonunion). This particular instance involves an open fracture, meaning the skin was broken, and is classified as either Type I or Type II according to the Gustilo-Anderson classification.

This code is appropriate for follow-up encounters for patients previously diagnosed with an open fracture of the distal ulna (Gustilo Type I or II) who are now presenting with evidence of nonunion. This would be used when the patient is receiving active treatment for the nonunion, such as surgical intervention or cast changes.

• Ensure documentation clearly specifies "nonunion" and the open fracture type (I or II) for the distal ulna.
• Verify this is a subsequent encounter, not the initial treatment for the fracture.
• Pair with an external cause code if the mechanism of injury is relevant and documented.