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

This code signifies a non-healing fracture located in the main part of the left ulna bone, which was initially an open fracture where the bone broke through the skin (Type I or II). The patient is currently in a subsequent phase of treatment, indicating ongoing care for this specific injury.

Apply this code when documenting follow-up care for a patient with a left ulnar shaft fracture that has not healed as expected, and the original injury involved an open wound. This is appropriate for encounters addressing the nonunion, such as follow-up appointments, imaging studies to assess healing, or preparation for revision surgery.

• Ensure documentation clearly specifies "left ulna" and "shaft" to differentiate from other ulnar fracture locations.
• Verify the initial injury was an "open fracture type I or II" and that the current encounter is for "nonunion."
• Always sequence this code after any primary treatment codes for the nonunion, if applicable.