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 BH04Z
Plain Radiography of L Single Mamm Duct using H Osm Contrast
Plain Radiography of L Single Mamm Duct using L Osm Contrast
Plain Radiography of L Single Mamm Duct using Oth Contrast
Plain Radiography of Left Single Mammary Duct