Idiopathic aseptic necrosis of unspecified toe(s)

This code represents the death of bone tissue in an unspecified toe due to a lack of blood supply, without an identifiable cause (idiopathic) and without infection (aseptic). This condition, also known as osteonecrosis or avascular necrosis, leads to bone collapse and can result in pain and joint dysfunction.

Use this code when documentation clearly indicates idiopathic aseptic necrosis affecting any toe, and the specific toe (e.g., great toe, lesser toe) is not specified. Supporting documentation should include imaging reports (X-ray, MRI) confirming osteonecrosis and clinical notes ruling out trauma, infection, or other systemic causes.

• Ensure "idiopathic" and "aseptic" are explicitly documented; otherwise, consider codes for secondary osteonecrosis.
• If a specific toe is identified (e.g., great toe, other toe), use the more specific M87.07- subcategories.
• Always review documentation for laterality (right, left, bilateral) to ensure the most precise code is selected, although this specific code is for unspecified laterality.