Modifier 91 with Gcodes

tmoffett2

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Are codes G0479 and G0483 are used with the 91 modifier. We are billing from a laboratory and not sure if these codes need a modifier or not?
 

CodingKing

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No. Modifier 91 is for the same lab procedure more than once in a day. Presumptive and definitive are 2 different tests.
 
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