Osteonecrosis due to previous trauma of left ulna

This code signifies the death of bone tissue in the left ulna resulting from a prior traumatic injury. This condition, also known as avascular necrosis, occurs when the blood supply to the bone is disrupted, leading to bone collapse and potential joint destruction.

Use this code when documentation clearly indicates osteonecrosis of the left ulna and explicitly links its etiology to a previous traumatic event. This applies to patients presenting with pain, limited range of motion, or imaging findings consistent with avascular necrosis in the specified bone, with a documented history of trauma to that area.

• Ensure the documentation specifies "left ulna" and explicitly states "due to previous trauma" to support this specific code.
• Do not use this code for osteonecrosis due to other causes (e.g., steroid use, idiopathic); separate codes exist for those etiologies.
• Consider sequencing this code after any acute traumatic injury code if the osteonecrosis is a direct sequela of a recent trauma.