Osteonecrosis due to drugs, right tibia

This code signifies the death of bone tissue in the right tibia resulting from the adverse effects of medication. This condition leads to bone collapse and pain, often progressing to joint destruction if left untreated. It is a specific form of osteonecrosis where drug exposure is identified as the causative factor.

Apply this code when documentation clearly indicates avascular necrosis of the right tibia and explicitly links its etiology to drug therapy. Common scenarios include patients on long-term corticosteroid use, bisphosphonates, or certain chemotherapeutic agents who develop tibial bone death. Supporting documentation should include imaging reports (e.g., MRI, X-ray) confirming osteonecrosis and a physician's statement attributing it to drug use.

• Ensure the laterality (right tibia) is precisely documented; do not use for left or unspecified tibia.
• Distinguish from osteonecrosis due to other causes (e.g., trauma, alcoholism, idiopathic) which have different codes.
• Code the specific drug causing the osteonecrosis using an adverse effect T-code as a secondary diagnosis, if known and documented.