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 BQ0HZ
Plain Radiography of Left Ankle using Other Contrast
Plain Radiography of Left Ankle using Low Osmolar Contrast
Plain Radiography of Left Ankle
Plain Radiography of Left Ankle using High Osmolar Contrast