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

This code signifies a bent or angulated right ulnar shaft that has healed in an anatomically incorrect position following a severe open fracture. The original fracture involved significant soft tissue damage, classified as Type IIIA, IIIB, or IIIC, and the current encounter is for ongoing management of the malunion.

This code is appropriate for subsequent encounters when a patient presents with a malunion of a previously sustained open fracture of the right ulnar shaft, specifically when the initial injury was a Type IIIA, IIIB, or IIIC open fracture. This would include follow-up appointments for monitoring, planning corrective osteotomy, or managing complications related to the malunion.

• Ensure documentation clearly specifies "malunion" of the right ulna, not nonunion or delayed union.
• Verify the original open fracture type (IIIA, IIIB, or IIIC) is documented to support the specificity of this code.
• Confirm this is a subsequent encounter, as indicated by the "R" seventh character, and not an initial or sequela encounter.