The Radionuclide Iodine 131 (I is identified by letter "G" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to CG42G
Nonimag Nucl Med Uptake Thyroid Gland w Technetium 99m
Nonimag Nucl Med Uptake of Thyroid Gland using Iodine 131
Nonimag Nucl Med Uptake Thyroid Gland w Oth Radionuclide
Nonimag Nucl Med Uptake of Thyroid Gland using Iodine 123