Other secondary osteonecrosis, right ankle

This code signifies the death of bone tissue in the right ankle due to an underlying medical condition or external factor, rather than a primary, idiopathic cause. This bone death results from a loss of blood supply to the affected area, leading to bone collapse and potential joint destruction.

Apply this code when documentation explicitly states "secondary osteonecrosis" affecting the right ankle. This diagnosis is often associated with conditions such as long-term corticosteroid use, alcoholism, trauma, or systemic lupus erythematosus. Supporting documentation should clearly identify the right ankle as the affected site and indicate a secondary etiology.

• Ensure the documentation specifies "secondary" osteonecrosis; do not use for idiopathic forms.
• Verify laterality (right ankle) is clearly documented.
• Code the underlying cause of the secondary osteonecrosis first, if known and documented.