The Qualifier None is identified by letter "Z" and occupies the 6th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B501YZ
Plain Radiography of Cereb & Cerebel Vein using Oth Contrast
Radiography of Cereb & Cerebel Vein using L Osm Contrast
Radiography of Cereb & Cerebel Vein using H Osm Contrast