The Contrast Low Osmolar is identified by number "1" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B21F1
Fluoroscopy of Other Bypass Graft using H Osm Contrast
Fluoroscopy of Other Bypass Graft using Low Osmolar Contrast
Fluoroscopy of Other Bypass Graft using Other Contrast