Osteonecrosis due to previous trauma of right carpus

This code signifies the death of bone tissue in the right wrist bones (carpus) resulting from a prior traumatic injury. This avascular necrosis impairs blood supply to the carpal bones, leading to bone collapse and joint dysfunction.

Apply this code when documentation explicitly states osteonecrosis of the right carpus and attributes its etiology to a past traumatic event. Supporting documentation should include imaging reports (e.g., MRI, X-ray) confirming avascular necrosis and a history of trauma to the right wrist.

• Ensure the laterality (right) and specific anatomical site (carpus) are clearly documented.
• Distinguish from osteonecrosis due to other causes (e.g., steroid-induced, idiopathic) which have different code assignments.
• Look for a documented history of trauma preceding the diagnosis of osteonecrosis.