If you report therapeutic thyroid cancer treatments with codes 79030 and 79035, you should also familiarize yourself with the other codes for radiopharmaceutical therapy, as follows:
79000 - Radiopharmaceutical therapy, hyper-thyroidism; initial, including evaluation of patient.
79001 - ...; subsequent, each therapy
79020 - Radiopharmaceutical therapy, thyroid suppression (euthyroid cardiac disease), including evaluation of patient
79100 - Radiopharmaceutical therapy, polycythemia vera, chronic leukemia, each treatment
79200 - Intracavitary radioactive colloid therapy
79300 - Interstitial radioactive colloid therapy
79400 - Radiopharmaceutical therapy, nonthyroid, nonhematologic
79420 - Intravascular radiopharmaceutical therapy, particulate
79440 - Intra-articular radiopharmaceutical therapy
79999 - Unlisted radiopharmaceutical therapeutic procedure.