Unsp fx upr end l tibia, subs for opn fx type I/2 w nonunion

This code signifies a non-healing fracture in the upper part of the left shin bone that was initially an open fracture (skin broken) of either Type I or II severity. The "subsequent encounter" indicates the patient is receiving ongoing care for this specific injury, which has failed to unite properly.

Apply this code when documenting follow-up care for a patient with a previously diagnosed open fracture of the proximal left tibia (Type I or II) that has progressed to nonunion. This would be used in scenarios such as clinic visits for monitoring, planning further interventions for nonunion, or during hospitalizations for surgical correction of the nonunion.

• Requires an additional code for the specific type of nonunion (e.g., malunion, delayed union).
• Ensure documentation clearly specifies "left" tibia and "upper end" or "proximal" region.
• Verify the original injury was an open fracture Type I or II and that nonunion is explicitly stated.