Aneurysmal bone cyst, right thigh

This code identifies a benign, fluid-filled lesion within the bone of the right thigh. This lesion is characterized by blood-filled spaces separated by fibrous septa and is typically expansile, potentially causing pain or swelling. It is not a true aneurysm but rather a cystic bone tumor.

Apply this code when documentation clearly indicates an aneurysmal bone cyst located specifically in the right femur or other bones comprising the right thigh. Supporting documentation should include imaging reports (e.g., X-ray, MRI) confirming the diagnosis and anatomical location, often alongside pathology reports from biopsy.

• Ensure laterality is precisely documented; distinguish between right, left, and unspecified thigh involvement.
• Do not confuse with other benign bone tumors or simple bone cysts; look for specific "aneurysmal bone cyst" terminology.
• Code any associated pathological fracture separately if present and documented.