Abdominal aortic ectasia

This code represents a localized, non-aneurysmal dilation of the abdominal aorta, where the diameter is larger than normal but does not meet the criteria for an aneurysm (typically less than 3 cm or less than 1.5 times the normal diameter). It indicates an abnormal widening of the abdominal aorta without reaching the threshold for a true aneurysm.

Use this code when diagnostic imaging (e.g., ultrasound, CT scan) reports a finding of abdominal aortic ectasia. Documentation should clearly state "ectasia" of the abdominal aorta, distinguishing it from an aneurysm or normal vessel size. This code is appropriate when the dilation is noted but does not meet the size criteria for an abdominal aortic aneurysm.

• Differentiate carefully from abdominal aortic aneurysm (I71.4-); ectasia is a distinct, less severe dilation.
• Ensure documentation specifies "abdominal" aorta to avoid confusion with thoracic aortic ectasia.
• Do not use this code if the dilation meets or exceeds aneurysm criteria; instead, code to the appropriate aneurysm category.