Oth fx left patella, subs for opn fx type 3A/B/C w nonunion

This code signifies a non-healing fracture of the left kneecap, specifically an open fracture of severe types (IIIA, IIIB, or IIIC), that is being treated in a subsequent encounter. Nonunion indicates that the bone fragments have failed to heal together after a prolonged period.

Apply this code when documenting follow-up care for a patient with a previously diagnosed open patellar fracture (left side) that has progressed to nonunion. This includes scenarios where surgical intervention for nonunion is being planned or has been performed, or during ongoing conservative management for the unhealed fracture.

• Ensure documentation clearly specifies "left" patella and "nonunion" for accurate code assignment.
• Verify the original injury was an open fracture classified as type IIIA, IIIB, or IIIC.
• This code is for subsequent encounters; an initial encounter for the same fracture would use a different code.