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

This code describes a situation where the patient has an unconfirmed type of fracture in the shaft of their left ulna, and it's an open fracture (Type I or II) that is now exhibiting nonunion. This means the bone fragments are not healing together as expected after a previous injury.

This code is appropriate for follow-up encounters where a patient with a previously diagnosed open fracture (Type I or II) of the left ulnar shaft is being treated for nonunion. It indicates ongoing management of the fracture's failure to heal, rather than the initial injury or routine healing.

• Ensure documentation clearly specifies "nonunion" and an "open fracture type I or II" for the left ulnar shaft.
• Verify this is a subsequent encounter, not the initial treatment for the fracture.
• Do not use if the fracture type (e.g., transverse, oblique) is specified; a more specific code would then be required.