Other osteonecrosis of left carpus

This code signifies the death of bone tissue in the left carpal bones due to insufficient blood supply, excluding specific named conditions like Kienböck's disease. It encompasses various etiologies leading to avascular necrosis within the left wrist, resulting in pain, stiffness, and potential collapse of the affected carpal bones.

Apply this code when documentation specifies osteonecrosis of the left carpus without identifying a more specific type, such as Kienböck's disease (M87.03-). This diagnosis is typically supported by imaging studies (e.g., MRI, X-ray) showing bone infarction and clinical findings consistent with avascular necrosis.

• Ensure the documentation explicitly states "left carpus" to differentiate from other anatomical sites.
• Verify that no more specific osteonecrosis code for the carpus (e.g., M87.03- for Kienböck's disease) is applicable.
• Always code the underlying cause of the osteonecrosis, if known and documented, as an additional diagnosis.