We had a patient who presented with an uncontrollable nosebleed, and the physician performed angiography of the external carotid arteries. What code would be assigned?


Selective external carotid angiography is coded with the add-on code 36227 if it is performed after a selective common or internal carotid artery angiogram (36222, 36223, or 36224). If bilateral external carotid angiograms are performed, add modifier -50.

If performed without a preceding common or internal carotid angiogram, assign unlisted code 37799 for selective external carotid angiography.


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