Oth fx upper end of unsp ulna, init for opn fx type 3A/B/C

This code signifies an open fracture of the proximal ulna, not otherwise specified as a specific type (e.g., Monteggia, olecranon), that has broken through the skin with significant soft tissue damage (Gustilo-Anderson Type IIIA, IIIB, or IIIC). This injury is being treated for the first time.

Apply this code for initial encounters involving patients presenting with an open fracture of the upper ulna where the specific fracture pattern is not documented, but the open nature is clearly classified as Gustilo-Anderson Type IIIA, IIIB, or IIIC. This would include severe open injuries requiring extensive debridement or reconstructive procedures.

• Ensure documentation clearly specifies "initial encounter" and the Gustilo-Anderson classification (IIIA, IIIB, or IIIC) for the open fracture.
• Do not use this code if a more specific fracture type of the proximal ulna (e.g., olecranon fracture) is documented.
• Verify laterality (left, right, or unspecified) if available in the medical record, as this code specifies "unspecified ulna."