Question:
Can modifier 91 be appended to every laboratory code that is reported more than one time on the same date of service?
Answer:
Although some third-party payers have suggested that modifier 91, Repeat Clinical Diagnostic Laboratory Test can be appended to every laboratory code that is reported more than one time on the same date of service, per the CPT® coding guidelines; this is not the appropriate method of reporting modifier 91. Modifier 91 indicates: In the course of treatment of the patient, it may be necessary to repeat the same laboratory test on the same day to obtain subsequent (multiple) test results.
CPT® copyright 2024 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.
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