Osteonecrosis due to previous trauma, right hand

This code signifies the death of bone tissue in the right hand resulting from a prior traumatic injury. This avascular necrosis occurs when blood supply to the bone is disrupted, leading to bone cell death and potential collapse of the affected bone. The condition is specifically linked to a past physical injury rather than other etiologies.

Apply this code when documentation clearly states osteonecrosis of the right hand and explicitly attributes its cause to a previous traumatic event. Supporting documentation would include imaging reports confirming avascular necrosis and a patient history detailing a relevant past hand injury. This code is appropriate when the trauma is no longer acute but is the underlying cause of the current bone necrosis.

• Ensure the documentation specifies "right hand" and not another anatomical site.
• Distinguish from osteonecrosis due to other causes (e.g., steroid-induced, idiopathic) which have different codes.
• Confirm the trauma is historical and not the immediate reason for the encounter; if acute trauma is present, sequence it appropriately.