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 B704YZ
Plain Radiography of Head & Neck Lymph using Oth Contrast
Plain Radiography of Head & Neck Lymph using L Osm Contrast
Plain Radiography of Head & Neck Lymph using H Osm Contrast