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 B21FYZ
Fluoroscopy of Other Bypass Graft using Other Contrast
Fluoroscopy of Other Bypass Graft using Low Osmolar Contrast
Fluoroscopy of Other Bypass Graft using H Osm Contrast