Osteonecrosis due to drugs, right ankle

This code signifies the death of bone tissue in the right ankle specifically caused by medication. This condition, also known as avascular necrosis, results from an interruption of blood supply to the bone, leading to bone collapse and joint destruction.

Apply this code when documentation clearly states osteonecrosis of the right ankle and explicitly links its etiology to drug use (e.g., corticosteroids, bisphosphonates). Supporting documentation should include imaging reports confirming osteonecrosis and a physician's note detailing the drug-induced cause.

• Ensure the laterality (right ankle) is clearly documented.
• Do not use this code for osteonecrosis due to other causes (e.g., trauma, alcoholism); specific codes exist for those etiologies.
• Code any associated drug adverse effect or poisoning code if applicable and documented.