Idiopathic aseptic necrosis of left radius

This diagnosis code signifies the death of bone tissue in the left radius due to a lack of blood supply, without an identifiable cause (idiopathic) and not caused by infection (aseptic). This condition leads to bone collapse and arthritis if left untreated.

Use this code for patients diagnosed with avascular necrosis specifically affecting the left radial bone, where no underlying etiology such as trauma, steroid use, or systemic disease has been identified. Documentation should clearly state "idiopathic aseptic necrosis of the left radius" or similar phrasing confirming the location and nature of the condition.

• Ensure the documentation specifies "idiopathic" and "aseptic" to differentiate from other forms of osteonecrosis.
• Verify the laterality is explicitly stated as "left radius"; codes exist for other sites and unspecified laterality.
• Do not confuse with codes for osteomyelitis or traumatic bone necrosis, which have different etiologies.