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 BN25Z
Computerized Tomography (CT Scan) of Facial Bones
CT Scan of Facial Bone using H Osm Contrast
CT Scan of Facial Bone using Oth Contrast
CT Scan of Facial Bone using L Osm Contrast