Osteonecrosis due to previous trauma of unspecified radius

This code describes the death of bone tissue in an unspecified radius bone, resulting from a prior traumatic injury. This condition, also known as avascular necrosis, occurs when the blood supply to the bone is disrupted due to the trauma, leading to bone collapse and potential joint destruction.

Use this code when documentation clearly indicates osteonecrosis of the radius that is directly attributed to a past traumatic event. This diagnosis is typically supported by imaging studies (e.g., X-ray, MRI) showing bone necrosis and a patient history detailing the previous trauma to the affected radius.

• Ensure documentation specifies "unspecified radius" if the laterality (left/right) is not documented.
• A secondary code for the specific type of previous trauma should be considered if known and still relevant.
• Distinguish from osteonecrosis due to other causes (e.g., corticosteroid-induced, idiopathic) which have different code assignments.