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 BL33Z
MRI of Low Extrem Tendon using Oth Contrast, Unenh, Enhance
MRI of Low Extrem Tendon using Oth Contrast
Magnetic Resonance Imaging (MRI) of Lower Extremity Tendons