Oth fx low end l tibia, 7thR

This code signifies a previously treated open fracture of the lower end of the left tibia, specifically a severe open fracture (Type IIIA, IIIB, or IIIC) that has healed in an unsatisfactory position. Malunion indicates that the bone fragments have united, but with significant angular or rotational deformity, or shortening, which may impair function.

Apply this code when documenting follow-up care for a patient whose left distal tibia open fracture (initially classified as Type IIIA, IIIB, or IIIC) has resulted in malunion. This is appropriate for encounters where the malunion is being assessed, monitored, or treated (e.g., for corrective osteotomy planning).

• Ensure documentation clearly specifies "malunion" and the "subsequent encounter" for the fracture.
• Verify the original fracture was an open fracture of the lower end of the left tibia, classified as Type IIIA, IIIB, or IIIC.
• Do not use for nonunion (failure of bone to heal) or delayed union (healing taking longer than expected without malalignment).