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 BW3GZ
Magnetic Resonance Imaging (MRI) of Pelvic Region
MRI of Pelvic Region using Oth Contrast, Unenh, Enhance
MRI of Pelvic Region using Oth Contrast