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 CP221Z
Tomo Nucl Med Imag of Cerv Spine using Technetium 99m
Tomo Nucl Med Imag of Cerv Spine using Oth Radionuclide