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

This code signifies an open fracture of the shaft of the ulna, where the specific location on the shaft is not documented. The "open" nature indicates a break in the skin, and the fracture is classified as a severe type (IIIA, IIIB, or IIIC) according to the Gustilo-Anderson classification, implying significant soft tissue damage and contamination. This code is used for the initial treatment encounter for such an injury.

Apply this code when a patient presents with an open fracture of the ulnar shaft, and the medical record does not specify the exact part of the shaft (e.g., proximal, middle, distal). It is appropriate for initial surgical intervention or emergency department visits where the open nature and Gustilo classification (IIIA, IIIB, or IIIC) are clearly documented. This code is also used when the ulna involved is not specified (e.g., left or right).

• Ensure the documentation explicitly states "open fracture" and specifies Gustilo type IIIA, IIIB, or IIIC.
• Only use this code for the initial encounter for treatment of the fracture. Subsequent care will require a different encounter character.
• Avoid using this code if the laterality (left or right ulna) is documented; instead, select a more specific code.