Anomalous origin of subclavian artery

This code represents a congenital heart anomaly where the subclavian artery originates from an atypical location, often the descending aorta, rather than its usual origin from the brachiocephalic trunk (right subclavian) or aortic arch (left subclavian). This aberrant origin can lead to the artery passing behind the esophagus, potentially causing dysphagia (dysphagia lusoria) or other compressive symptoms.

Use this code for documented cases of an anomalous origin of the subclavian artery, regardless of whether symptoms are present. This diagnosis is typically made through imaging studies such as CT angiography, MRI, or echocardiography. Documentation should clearly identify the aberrant origin of the subclavian artery.

• Do not confuse this with other congenital anomalies of the great vessels unless the subclavian artery's origin is specifically identified as anomalous.
• If dysphagia is present due to this anomaly, code the dysphagia separately (e.g., R13.12 for oropharyngeal dysphagia) and sequence it after the congenital anomaly if it is a manifestation.
• Ensure the documentation specifies "anomalous origin" to differentiate from other subclavian artery abnormalities like stenosis or occlusion.