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 C75LYZ
Nonimag Nucl Med Prob of Up Chest Lymph using Technetium 99m
Nonimag Nucl Med Prob Up Chest Lymph w Oth Radionuclide