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 B24DZ
Ultrasonography of Pediatric Heart, Transesophageal
Ultrasonography of Pediatric Heart using Other Contrast
Ultrasonography of Pediatric Heart, Intravascular
Ultrasonography of Pediatric Heart