Other cyst of bone, right lower leg

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

Apply this code when documentation clearly identifies a bone cyst in the right tibia or fibula that is not specified as aneurysmal, solitary, or osteofibrous. This diagnosis is often made based on imaging studies such as X-rays, CT scans, or MRI.

• Ensure laterality (right lower leg) is explicitly documented.
• Distinguish from specific types of bone cysts (e.g., solitary bone cyst, aneurysmal bone cyst) which have their own distinct codes.
• If a pathological fracture is present due to the cyst, code the fracture first, followed by the bone cyst.