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 B93FZ
Magnetic Resonance Imaging (MRI) of Nasopharynx/Oropharynx
MRI of Nasophar/Orophar using Oth Contrast
MRI of Nasophar/Orophar using Oth Contrast, Unenh, Enhance