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 BQ3HZ
MRI of L Ankle using Oth Contrast
Magnetic Resonance Imaging (MRI) of Left Ankle
MRI of L Ankle using Oth Contrast, Unenh, Enhance