Ask Dr. Z

Can you please provide any updated guidance on the newly published coding guideline from Coding Clinic for HCPCS, 4Q, 2021 for reporting iFR without administration of pharmacologic stress agent with CPT 93799, Unlisted cardiovascular service? Explanation provided indicates that reporting CPT 93571 with modifier -74 for hospital outpatient reporting is not appropriate use of the modifier. The guideline published in the 2021 Cardiovascular Reference directs the use of modifier -74 on CPT 93571 when performed without administration of a medication.