The Contrast None is identified by letter "Z" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B43GZ
Magnetic Resonance Imaging (MRI) of L Low Extrem Art
MRI of L Low Extrem Art using Oth Contrast
MRI of L Low Extrem Art using Oth Contrast, Unenh, Enhance