Cervical rib

This code represents the presence of an extra rib originating from the seventh cervical vertebra, which is a congenital anomaly. This supernumerary rib can be unilateral or bilateral and may be fully formed or rudimentary. It often extends towards the first thoracic rib or sternum.

Use this code when documentation explicitly states the diagnosis of a cervical rib. This diagnosis is typically made through imaging studies such as X-rays, CT scans, or MRI, which confirm the presence of the anomalous rib. It may be an incidental finding or associated with symptoms of thoracic outlet syndrome.

• Do not confuse with other congenital anomalies of the ribs or spine.
• If the cervical rib is causing symptoms (e.g., thoracic outlet syndrome), code the symptomatic condition first, followed by this code as a secondary diagnosis.
• Ensure documentation clearly identifies the rib as cervical in origin, not a variation of a thoracic rib.