Other cyst of bone, left ankle and foot

This code signifies the presence of a non-neoplastic, fluid-filled or semi-solid sac within the bone structure of the patient's left ankle or foot. These cysts are typically benign and can arise from various etiologies, including trauma, degenerative processes, or developmental anomalies.

Apply this code when documentation clearly identifies a bone cyst located in the left ankle or foot, and the specific type of cyst is not otherwise classified (e.g., aneurysmal bone cyst, unicameral bone cyst). Supporting documentation should include imaging reports (X-ray, MRI, CT) confirming the cyst's presence and location, along with a physician's diagnostic statement.

• Ensure the laterality (left) is explicitly documented for the ankle or foot.
• Differentiate from specific types of bone cysts that have their own unique ICD-10-CM codes.
• Do not use for soft tissue cysts or cysts of joints; this code is specific to bone.