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 B24DZZ
Ultrasonography of Pediatric Heart, Transesophageal
Ultrasonography of Pediatric Heart
Ultrasonography of Pediatric Heart using Other Contrast
Ultrasonography of Pediatric Heart, Intravascular