Unsp fx upr end l ulna, subs for opn fx type I/2 w malunion

This code signifies a fracture of the upper portion of the left ulna, where the specific type of fracture (e.g., transverse, oblique) is not documented. The injury was initially an open fracture classified as Type I or II, and the current encounter addresses complications related to improper healing, specifically malunion.

Apply this code when a patient presents for follow-up care or treatment of a malunited, previously open (Type I or II) fracture of the proximal left ulna, and the precise fracture morphology was not specified in the initial diagnosis. This is appropriate for encounters where the focus is on managing the consequences of the malunion rather than the acute injury.

• Ensure documentation clearly states "malunion" and a prior "open fracture type I or II" of the left ulna.
• This code is for subsequent encounters; do not use for the initial treatment of the fracture.
• If the specific type of fracture (e.g., olecranon, coronoid process) is known, a more specific code should be used.