Idiopathic aseptic necrosis of left finger(s)

This code signifies the spontaneous death of bone tissue in one or more fingers of the left 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 subsequent joint destruction.

Apply this code when documentation clearly indicates idiopathic avascular necrosis affecting any finger(s) on the patient's left hand. This diagnosis is typically supported by imaging studies (e.g., X-ray, MRI) showing bone necrosis and a clinical history ruling out traumatic, infectious, or systemic causes.

• Ensure the documentation specifies "idiopathic" or "aseptic" and clearly identifies the left hand and finger(s).
• Do not use this code if a specific cause for the avascular necrosis (e.g., trauma, steroid use, sickle cell disease) is identified; instead, code to the specific etiology.
• Verify laterality. If the condition affects the right finger(s), a different code is required.