Laboratory Question for the Week of March 6, 2023


What is the intent of new code 84433?


This new code was established for enzyme activity testing of Thiopurine S-methyltransferase (TPMT) to aid in the identification of individuals at greater risk for hepatoxicity from increased thiopurine dosage.

This question was answered in our Coding Essentials for Laboratories. For more hot topics relating to laboratory services, please visit our store or call us at 1.800.252.1578, ext. 2.


CPT® copyright 2022 American Medical Association (AMA). All rights reserved.

Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

CPT is a registered trademark of the American Medical Association.