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 BN23Z
CT Scan of Bi Orbit using H Osm Contrast
Computerized Tomography (CT Scan) of Bilateral Orbits
CT Scan of Bi Orbit using L Osm Contrast
CT Scan of Bi Orbit using Oth Contrast