If you use a product that differentiates between influenza A & B, you should report 87804 twice. When you get two results from a test, you should code for two units.
For payers that do not recognize two units of 87804 and deny the second charge as a duplicate, use modifier 59 on the second 87804 entry. This modifier indicates that a different test was performed to test for a distinct strain.
Hope this helps~
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