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 BN20Z
Computerized Tomography (CT Scan) of Skull
CT Scan of Skull using H Osm Contrast
CT Scan of Skull using L Osm Contrast
CT Scan of Skull using Oth Contrast