Osteonecrosis due to previous trauma, unspecified femur

This code signifies the death of bone tissue in an unspecified part of the femur, resulting from a prior traumatic injury. It indicates avascular necrosis of the thigh bone where the specific location of the necrosis within the femur is not documented.

Apply this code when documentation clearly states osteonecrosis of the femur and explicitly links it to a past traumatic event, but the specific femoral head, neck, shaft, or condyle is not specified. This is appropriate when the physician's diagnosis is "avascular necrosis of femur due to old trauma, site unspecified."

• Ensure the documentation explicitly states a causal link between the osteonecrosis and a previous trauma.
• Avoid using this code if a more specific anatomical site of the femoral osteonecrosis (e.g., femoral head) is documented; instead, use the appropriate M87.25- subcategory.
• Do not use for osteonecrosis due to current trauma; that would typically fall under a pathological fracture code.