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 B241ZZ
Ultrasonography of Mult Cor Art using Oth Contrast
Ultrasonography of Multiple Coronary Arteries
Ultrasonography of Multiple Coronary Arteries, Transesoph
Ultrasonography of Multiple Coronary Arteries, Intravascular