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

This code signifies a malunion or deformity of the ulna bone, specifically when the bone has healed in a bent or angulated position following an open fracture of type I or II. This condition is identified during a subsequent encounter, indicating that the initial treatment for the fracture has already occurred, but the bone has not healed correctly.

Use this code when a patient presents for follow-up care of an ulna fracture that was initially open (Type I or II) and has now healed with a noticeable angulation or bending, indicating a nonunion. This applies to situations where the bent bone is the primary focus of the current encounter, such as for evaluation of the deformity or planning for corrective surgery.

• Ensure documentation clearly specifies "bent bone" or "angulated nonunion" of the ulna.
• Verify the original fracture was an open Type I or II and that this is a subsequent encounter.
• Do not use for initial fracture treatment or for closed fractures.