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Thread: difference between 76 and 91 modifiers

  1. #1

    Default difference between 76 and 91 modifiers

    AAPC: Back to School
    Hi All,

    Can we use modifier 76 if a pathology laboratory service is repeated? can anybody explain me the difference between 76 and 91 modifiers.

    Any help is greatly apreciated.

    Prem, B.Pharm;CPC

  2. #2
    Join Date
    Apr 2007
    orange, ca


    it is my understanding that mod -91 is/should be used for repeat lab/path testing....since sometimes it is necessary to repeat the same lab test on the same day to obtain multiple/additional test results. but also, you can NOT use this modifier to rerun or confirm initial results or if there were testing problems.

    for mod -76 this is typically used for a repeat pricedure/service by the same physician(non-lab related)

    these are both summarized/explained in appendix A of the CPT manual....

    in your case, you should be appending modifier -91 instead of -76 since it is a lab/path repeat

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