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 B20FYZ
Plain Radiography of Other Bypass Graft using H Osm Contrast
Plain Radiography of Other Bypass Graft using L Osm Contrast
Plain Radiography of Other Bypass Graft using Other Contrast