Aneurysmal bone cyst, right forearm

This code signifies the presence of an aneurysmal bone cyst (ABC) located specifically in the right forearm. An ABC is a benign, expansile, osteolytic bone lesion characterized by blood-filled spaces separated by fibrous septa, often presenting with pain and swelling.

Apply this code when documentation clearly identifies an aneurysmal bone cyst affecting the right forearm. This diagnosis is typically confirmed through imaging studies such as X-rays, MRI, or CT scans, often followed by biopsy for definitive histological confirmation.

• Ensure laterality is precisely documented (right vs. left forearm) to avoid coding errors.
• Distinguish from other benign bone tumors or tumor-like lesions, such as fibrous dysplasia or unicameral bone cysts.
• Code any associated pathological fractures separately if documented.