Osteonecrosis due to previous trauma, unspecified fibula

This code signifies the death of bone tissue in an unspecified fibula, resulting from a prior traumatic injury. This condition, also known as avascular necrosis, occurs when the blood supply to the bone is disrupted, leading to bone collapse and potential joint destruction. It specifically identifies the fibula as the affected bone and attributes the etiology to a past trauma.

This code is appropriate for documenting osteonecrosis of the fibula where the patient's history clearly indicates a previous traumatic event as the causative factor, but the specific fibula (left or right) is not documented. It should be used when imaging studies (e.g., MRI, X-ray) confirm bone necrosis and the physician's notes link this to an earlier injury.

• Ensure documentation explicitly states "previous trauma" as the etiology; otherwise, consider other M87.x codes.
• Avoid using this code if the specific fibula (left or right) is identified; instead, select the more specific M87.261 or M87.262.
• Always sequence this code after the code for the underlying traumatic injury, if still active, or as a primary diagnosis if the osteonecrosis is the current focus of treatment.