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    Wiki CPT 87804 with modifier X{EPSU}

    This question was posted by someone in Dermatology forum and was suggested to re-post here. The original question is: When coding the flu A and B test - we use 87804 and 87804-59 mod?? I have noticed that medicare is denying the second test?? Is this because we are not using the "X" modifiers...
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