Osteonecrosis due to drugs, left fibula

This diagnosis code signifies the death of bone tissue in the left fibula resulting from the use of certain medications. 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.

Use this code when documentation explicitly states osteonecrosis of the left fibula and attributes its etiology to drug use. This typically involves patients with a history of corticosteroid use, bisphosphonate therapy, or other medications known to cause avascular necrosis.

• Ensure the documentation clearly specifies "left fibula" and "due to drugs" to support this specific code.
• Do not confuse with osteonecrosis due to other causes (e.g., trauma, alcoholism), which have different codes.
• Code any associated pathological fractures of the left fibula separately, if present.