Oth fx shaft of l ulna, 7thR

This code signifies a malunion of an open fracture (Type IIIA, IIIB, or IIIC) of the shaft of the left ulna, specifically for a subsequent encounter. A malunion indicates that the bone has healed in an abnormal or misaligned position following the initial injury. This diagnosis reflects ongoing management of the improperly healed fracture.

This code is appropriate when a patient presents for follow-up care of a previously sustained open fracture of the left ulnar shaft that has healed with a noticeable deformity or misalignment. It applies to encounters where the focus is on addressing the consequences of the malunion, such as pain, limited range of motion, or planning for corrective procedures.

• Ensure documentation clearly specifies "malunion" and the "left ulna shaft" as the affected site.
• Verify the original fracture was an "open fracture type IIIA, IIIB, or IIIC" as this is a specific inclusion criterion.
• This code is for subsequent encounters; use an initial encounter code for the acute injury.