Correct reporting and billing of medical procedures and services begins with CPT 2018 Standard Edition. The AMA publishes the only CPT codebook with the official CPT coding guidelines developed by the CPT Editorial Panel. The updates that appear in this revision have been prepared by the CPT Editorial Panel with the assistance of physicians representing all specialties of medicine, and with important contributions from many third-party payers and government organizations. CPT is a registered trademark of the American Medical Association.