Unsp fx shaft of r ulna, subs for opn fx type I/2 w nonunion

This code signifies a fracture of the main part (shaft) of the right ulna, where the specific type of fracture is not documented. It indicates that the fracture was initially an open fracture (meaning the skin was broken) of either Type I or II, and the bone has failed to heal properly in a subsequent encounter.

This code is appropriate when a patient presents for follow-up care of a previously treated open fracture of the right ulnar shaft, and the physician documents that the fracture has not united. This applies to situations where the initial open fracture was classified as Gustilo-Anderson Type I or II, and the exact fracture pattern of the shaft is not specified.

• Ensure documentation clearly states "nonunion" for the right ulnar shaft fracture.
• Verify the initial fracture was an open fracture, specifically Type I or II.
• Confirm this is a subsequent encounter, not the initial treatment.