Path/Lab Coding:
Decide Between These Codes for TPMT Activity Testing
Published on Tue Jun 23, 2026
Question: A provider wants to begin azathioprine (AZA) therapy for a patient with rheumatoid arthritis and has ordered thiopurine methyltransferase (TPMT) activity testing to calculate the correct dosage of AZA to give to the patient. Should we report 82657 or 81335 for the TPMT activity test? Revenue Cycle Insider Subscriber Answer: Neither of those codes is an accurate way to [...]