Unsp fx low end r ulna, subs for opn fx type I/2 w nonunion

This code signifies a nonunion of an unspecified fracture at the lower end of the right ulna, initially sustained as an open fracture of Gustilo type I or II. Nonunion indicates that the bone has failed to heal completely after the initial injury, requiring further medical attention.

This code is appropriate for follow-up encounters where a patient is being treated for a previously diagnosed open fracture of the distal right ulna that has not healed. It applies when the original open fracture was classified as Gustilo type I or II, and the current clinical assessment confirms nonunion.

• Ensure documentation clearly specifies "nonunion" and the original open fracture type (I or II).
• Verify laterality (right ulna) is consistently documented.
• Do not use for initial encounters or for fractures that have healed.