The Contrast None is identified by letter "Z" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B328Z
Computerized Tomography (CT Scan) of Bi Int Carotid
CT Scan of Bi Int Carotid using L Osm Contrast
CT Scan of Bi Int Carotid using Intravasc Optic Cohere
CT Scan of Bi Int Carotid using H Osm Contrast
CT Scan of Bi Int Carotid using Oth Contrast