Flail joint, right ankle and foot

This code signifies a flail joint affecting the right ankle and foot. A flail joint is characterized by abnormal, excessive, and uncontrolled mobility, often resulting from severe ligamentous laxity, muscle paralysis, or bone destruction, leading to instability and impaired function.

Use this code when documentation explicitly states a "flail joint" condition localized to the patient's right ankle and/or foot. This typically arises from severe trauma, neuromuscular disorders, or degenerative processes that compromise joint integrity. Supporting documentation should detail the instability and lack of functional control in the specified anatomical area.

• Ensure laterality is clearly documented as "right" for the ankle and foot.
• Distinguish from simple joint instability (e.g., sprains) which do not involve the severe, uncontrolled mobility of a flail joint.
• Code any underlying cause or associated conditions (e.g., paralysis, fracture nonunion) in addition to the flail joint.