I'm working for an ENT practice, and we need to know the appropriate way to bill Medicare for 95165. We start with 2 10cc vials (one environmental and one pollen), and then dilute the serums into 6 different sets of vials, one set of 6 for environmental extracts and one set of six for pollen extracts. Medicare only allows billing 20 units per claim for this scenario (10 per vial). Do we bill 20 units for 6 different service dates to cover all the serums. If they ask for records, our original mixing log will only have the first service date, so how do we provide documentation for the other service dates for the remaining claims? Any advice or direction would be appreciated!