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 BH3GZ
MRI of Thorax Subcu using Oth Contrast
Magnetic Resonance Imaging (MRI) of Thorax Subcu
MRI of Thorax Subcu using Oth Contrast, Unenh, Enhance