Solitary bone cyst, left ulna and radius

This code signifies the presence of a single, non-cancerous, fluid-filled lesion within the bone tissue of both the ulna and radius in the left arm. These cysts are typically benign and often asymptomatic, discovered incidentally on imaging. They represent a localized area of bone resorption and fibrous tissue replacement.

Apply this code when documentation clearly indicates a solitary bone cyst affecting both the left ulna and left radius. This diagnosis is typically confirmed by imaging studies such as X-rays, CT scans, or MRI. Use this code for initial diagnosis, follow-up, or when the cyst is the primary reason for the patient's encounter.

• Ensure laterality (left) and specific bones (ulna and radius) are explicitly documented.
• Distinguish from aneurysmal bone cysts (M85.5-) or other bone lesions.
• Do not use if the cyst is described as "multiple" or "unspecified."