That's not an excessive number of immunostains. Each unit indicates an individual stain used to highlight different antibodies in the specimen. You wouldn't bill 88342 x2 if the same stain was performed twice (CK7x2 would only merit one charge), but you would bill x2 if two different stains were performed...say CK7 and CK20. x3 for CK7, CK20, TTF-1, etc. Each stain it's interpretation should be reported.
The number of stains performed depends on the tumor morphology.
The code is for "each" so you shouldn't need a modifier. Depending on the payer though, they may require a -76. Some payers want -59 for some reason. This is not a clinical lab test so -91 doesn't apply but some payers might want that too. I haven't come across it though.
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