Coding for In House COVID Tests

If you do a POC COVID test on a child with respiratory symptoms, are you getting paid if you use ICDs for say URI, or you must use one of the new Z20.828 or Z03.818 codes to get paid for the COVID test?

We have not tried to submit without a COVID related dx as we want to make sure the visit is covered without cost sharing if possible. If the test is negative, we use Z03.818 and if it is positive U07.1. Those are always the primary diagnosis on the claim and then any other diagnosis/symptoms are listed as secondary.

I had a BCBS of Texas pay with primary DX of R05.
Amerigroup paid with R50.9 as primary and another Amerigroup that paid after using J06.9 as primary.