Osteonecrosis due to previous trauma, left tibia

This code signifies the death of bone tissue in the left tibia that has occurred as a direct consequence of a prior traumatic injury. This condition, also known as avascular necrosis, results from an interruption of blood supply to the bone.

Apply this code when documentation explicitly states osteonecrosis of the left tibia and clearly links its etiology to a previous traumatic event. This is appropriate for patients presenting with pain, limited mobility, or imaging findings consistent with avascular necrosis following a documented injury to the left lower leg.

• Ensure the documentation specifies "left" tibia; laterality is crucial for accurate coding.
• Confirm the causal link between the osteonecrosis and a previous trauma, not an acute injury.
• Do not use for osteonecrosis due to other causes (e.g., steroid-induced, idiopathic); specific codes exist for those etiologies.