Solitary bone cyst, right ulna and radius

This code signifies the presence of a solitary bone cyst, also known as a unicameral bone cyst, located specifically in the right ulna and/or radius. These are benign, fluid-filled lesions that typically occur in the metaphysis of long bones, often discovered incidentally or following a pathological fracture.

Apply this code when documentation confirms a diagnosis of a solitary bone cyst affecting the right ulna and/or radius. This is appropriate for initial diagnosis, follow-up, or when the cyst is identified as the underlying cause of symptoms or a fracture. Supporting documentation includes imaging reports (X-ray, MRI) and physician notes detailing the cyst's location and nature.

• Ensure laterality is explicitly documented as "right" for the ulna and/or radius.
• Do not use this code for aneurysmal bone cysts or other types of benign bone tumors; specific codes exist for those conditions.
• If a pathological fracture is present due to the cyst, sequence the fracture code first, followed by this code as an underlying condition.