AMA CPT® Assistant - 2001 Issue 9 (September)

Modifier -59 vs -91 (September 2001)

September 2001 page 10b Coding Consultation Modifier -59 vs -91 Question When reporting two wound culture laboratory testing procedures, should Modifier '-59' or '-91' be used to identify a second culture of a different wound site? AMA Comment Since the wound cultures were taken from two separate sites, modifier -59 should be appended to the culture code. As indicated in the descriptor language for use of modifier -91, it is used to identify repeat performance of the same laboratory test on the same day to obtain subsequent (multiple) test results. If a second culture was performed of the same...

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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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