Bent bone of l ulna, subs for opn fx type 3A/B/C w nonunion

This code signifies a non-healing fracture of the left ulna, specifically a bent bone (malunion or deformity) resulting from a severe open fracture (Type IIIA, IIIB, or IIIC). The "subsequent encounter" indicates that the patient is receiving follow-up care for this complication after initial treatment.

Apply this code when documentation confirms a patient is being treated for a nonunion of a previously sustained, severe open fracture of the left ulna, where the bone has healed in a bent or deformed position. This is appropriate for ongoing management, such as surgical intervention for nonunion or continued conservative management.

• Ensure documentation clearly specifies "nonunion" and the "subsequent encounter" for this specific type of open fracture.
• Verify the laterality (left ulna) and the specific type of open fracture (IIIA, IIIB, or IIIC) are documented.
• Do not use this code for initial treatment of the fracture or for routine follow-up of a healing fracture without nonunion.