Idiopathic aseptic necrosis of right finger(s)

This code describes the spontaneous death of bone tissue in one or more fingers of the right hand due to a lack of blood supply, without an identifiable cause such as trauma or infection. This condition, also known as avascular necrosis or osteonecrosis, leads to bone collapse and joint destruction over time.

Apply this code when documentation clearly indicates avascular necrosis affecting the right finger(s) and the etiology is determined to be idiopathic. This diagnosis is typically supported by imaging studies (e.g., X-ray, MRI) showing bone infarction and clinical findings consistent with localized pain and dysfunction.

• Ensure laterality (right) and body part (finger(s)) are explicitly documented.
• Confirm the "idiopathic" nature; if a cause is identified (e.g., trauma, steroid use), a more specific code from M87.1-M87.3 should be used.
• Do not confuse with osteomyelitis (M86.-) or other forms of bone necrosis with known causes.