Idiopathic aseptic necrosis of unspecified radius

This code signifies the spontaneous death of bone tissue in an unspecified radius, not caused by infection or trauma. It represents avascular necrosis (AVN) of the radial bone where the underlying cause is unknown. This condition can lead to pain, joint dysfunction, and eventual collapse of the affected bone.

Use this code when documentation clearly indicates idiopathic avascular necrosis affecting the radius, without specifying which radius (left or right). This diagnosis is typically made after imaging studies (e.g., X-ray, MRI) confirm bone necrosis and other causes like trauma, infection, or systemic diseases have been ruled out.

• Ensure the documentation explicitly states "idiopathic" or "aseptic" and specifies the radius as the affected bone.
• If the laterality (left or right radius) is documented, a more specific code from the M87.03- subcategory should be used.
• Do not use this code if the avascular necrosis is secondary to another condition (e.g., trauma, steroid use); instead, refer to the appropriate M87.1- or M87.2- codes.