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 BQ28YZ
CT Scan of L Knee using Oth Contrast
CT Scan of L Knee using L Osm Contrast
CT Scan of L Knee using H Osm Contrast
Computerized Tomography (CT Scan) of Left Knee