Bent bone of unsp ulna, subs for opn fx type I/2 w malunion

This code describes a specific type of healing complication where an open fracture of the ulna, initially classified as Type I or II, has healed with an abnormal angulation or curvature. The "bent bone" indicates a deformity of the ulna resulting from the fracture's healing process. This is a subsequent encounter, meaning the patient is being seen for ongoing management of this malunion, not the initial injury.

Use this code when documenting follow-up care for a patient who previously sustained an open ulna fracture (Type I or II) and now presents with a clinically significant malunion, characterized by a bent or abnormally angled bone. This applies to scenarios such as assessing the functional impact of the deformity, planning corrective osteotomy, or monitoring the stability of the malunion.

• Ensure documentation clearly specifies "malunion" and not "nonunion" or "delayed union," as these are distinct conditions.
• Verify the original fracture was an open Type I or II ulna fracture to justify the specificity of this code.
• Confirm this is a subsequent encounter for the malunion, not the initial treatment of the fracture or a new injury.