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 B236ZZ
MRI of R & L Heart using Oth Contrast, Unenh, Enhance
MRI of R & L Heart using Oth Contrast
Magnetic Resonance Imaging (MRI) of Right and Left Heart