The Qualifier None is identified by letter "Z" and occupies the 6th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to BL33YZ
Magnetic Resonance Imaging (MRI) of Lower Extremity Tendons
MRI of Low Extrem Tendon using Oth Contrast
MRI of Low Extrem Tendon using Oth Contrast, Unenh, Enhance