Other cyst of bone, left forearm

This diagnosis code signifies the presence of a non-neoplastic, fluid-filled or semi-solid sac within the bone structure of the patient's left forearm. These cysts are typically benign and can be asymptomatic or cause localized pain, swelling, or pathological fractures.

Apply this code when documentation specifies a bone cyst located in the left forearm, and the provider has ruled out neoplastic processes. This code is appropriate for simple bone cysts, aneurysmal bone cysts, or other non-specified benign cystic lesions of the bone in this specific anatomical location.

• Ensure the documentation clearly specifies "left forearm" to support laterality and anatomical site.
• Distinguish from bone tumors (benign or malignant) which have different code categories.
• If the cyst is a sequela of trauma or infection, consider additional codes to fully describe the patient's condition.