The Radionuclide Iodine 123 (I is identified by letter "F" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to CT13F
Planar Nuclear Medicine Imaging of KUB using Iodine 131
Planar Nucl Med Imag of KUB using Oth Radionuclide
Planar Nuclear Medicine Imaging of KUB using Iodine 123
Planar Nuclear Medicine Imaging of KUB using Technetium 99m