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 CD171Z
Planar Nucl Med Imag of GI Tract using Oth Radionuclide
Planar Nucl Med Imag of GI Tract using Technetium 99m
Planar Nuclear Medicine Imaging of GI Tract using Indium 111