Osteonecrosis due to drugs, right fibula

This code signifies the death of bone tissue in the right fibula, specifically attributed to the adverse effects of medication. This condition, also known as avascular necrosis, results from an interruption of blood supply to the bone, leading to its collapse and potential joint destruction.

Use this code when documentation clearly states osteonecrosis of the right fibula and explicitly links its etiology to drug therapy. Common scenarios include patients on long-term corticosteroid use, bisphosphonates, or other medications known to cause avascular necrosis. The medical record should specify the affected bone and the drug causation.

• Ensure the documentation specifies "right fibula" and not a different bone or laterality.
• Always sequence this code after the underlying drug-induced condition, if applicable, or as the primary diagnosis if the osteonecrosis is the main reason for the encounter.
• Do not confuse with osteonecrosis due to other etiologies (e.g., trauma, alcoholism), which have distinct codes.