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 CP18YZ
Planar Nucl Med Imag of R Up Extrem using Technetium 99m
Planar Nucl Med Imag of R Up Extrem using Oth Radionuclide