AMA CPT® Assistant - 2002 Issue 6 (June)

Modifier -59 vs Modifier -91 (June 2002)

June 2002 pages 1-3 Modifier -59 vs Modifier -91 Since the introduction of modifier -91, many questions have been raised regarding its use vs modifier -59. Some third-party payers have suggested that modifier -91 can be appended to every laboratory code that is reported more than one time on the same date of service. However, per the CPT coding guidelines, this is not the appropriate method of reporting modifier -91. The purpose of this article is to clarify some of the confusion surrounding the reporting of modifier -91 and modifier -59. We will discuss the intent of these two...

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CPT® Assistant content is the official source for CPT® coding guidance. It is an instrumental tool when appealing insurance denials and validating coding to auditors. Monthly issues and an extensive archive provide comprehensive guidance on proper CPT® coding for past, present and upcoming code set releases. Archives date back to 1990 for historical use of codes, changes, rationales, coding tips and trends in the industry.

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