Idiopathic aseptic necrosis of right foot

This code signifies the death of bone tissue in the right foot due to a lack of blood supply, without an identifiable cause (idiopathic) and not associated with infection (aseptic). This condition, also known as avascular necrosis, leads to bone collapse and subsequent arthritis.

Apply this code when documentation clearly states idiopathic aseptic necrosis affecting the right foot. This diagnosis is typically made based on imaging studies (e.g., MRI, X-ray) showing bone infarction and clinical presentation of pain and dysfunction in the foot, with no clear etiology like trauma, steroid use, or systemic disease.

• Ensure documentation specifies "idiopathic" and "aseptic" to differentiate from other forms of osteonecrosis.
• Verify laterality (right foot) is clearly documented; separate codes exist for the left foot, bilateral, or unspecified.
• Consider additional codes for any associated pathological fractures or secondary osteoarthritis.