Oth fx lower end r ulna, subs for opn fx type I/2 w nonunion

This code signifies a fracture of the lower portion of the right ulna that is not otherwise specified, meaning it doesn't fit into more specific categories like styloid or epiphyseal. It specifically indicates that the fracture was initially an open fracture (Type I or II, implying a relatively small skin wound) and is now being treated for a nonunion, where the bone fragments have failed to heal together.

This code is appropriate for documenting follow-up care for a patient who sustained an open fracture of the distal right ulna (excluding styloid or epiphyseal fractures) and is currently experiencing a nonunion. This would include situations where surgical intervention or other treatments are being performed to address the failed healing.

• Ensure documentation clearly specifies "nonunion" and the initial open nature (Type I or II) of the fracture.
• Verify the fracture location is the lower end of the ulna and on the right side.
• Do not use for malunion, which indicates healing in an incorrect position.