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Wiki Cystic Fibrosis lab test and modifiers

pherja

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Location
St Louis, MO
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I am looking for information regading the 7Z and 8A modifiers when billing the following CPT codes for Cystic Fibrosis lab tests:
83891
83900
83901
83909
83912
83914
Can someone explain to me if these modifiers are appropriate and at what times they would be used with these codes. I never come across this and have searched the internet looking for something without much luck.

Thank you in advance for any assistance!
 
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