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Modifier 91 Clarification

  1. #1
    Default Modifier 91 Clarification
    Medical Coding Books
    Good afternoon. We are a pain management group. We do random drug testing on our patients in our office. If the results are not what we expect to see, we send the sample out to an independent lab for a quantitative analysis.
    However, our lab charges are being denied as duplicate services. We have put a -91 modifier on our codes, but our billing software gives us a message "Inappropriate use of repeat modifier with a laboratory procedure". Any assistance on how to appropriate code these so our practice and the lab are reimbursed would be greatly appreciated. Thank you!

  2. #2
    My CPT says in a note that Modifier 91 ...may not be used when tests are rerun to confirm initial results;...

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