POL billing

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I am also trying to bill POL claims and have no clue. Is the date of service the day we did the testing or the day we collected the specimen? Should I bill under the provider that ordered it or the provider at the location of our lab? Is the high complexity CLIA attached to CPT's or Tax ID? Is the CLIA specific to location , in other words does the address listed on our CLIA need to match the address listed on the claim? I have so many questions and I'm not sure who to ask.