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 B246YZ
Ultrasonography of Right and Left Heart
Ultrasonography of Right and Left Heart, Transesophageal
Ultrasonography of Right and Left Heart, Intravascular
Ultrasonography of Right and Left Heart using Other Contrast