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 CW51YZ
Nonimag Nucl Med Prob of Abd & Pelvis using Oth Radionuclide
Nonimag Nucl Med Prob of Abd & Pelvis using Technetium 99m
Nonimag Nucl Med Prob of Abd & Pelvis using Indium 111