Our office performes presumptive drug testing on our pain management patients in our in house lab, we send out for definitive results. This year we are now filing 80307 for these presumptive drug screens. I've gotten a good many denials from Medicare and Medicare Advantage plans with the reason "This service is not covered by Medicare". Is anyone else having issues getting Medicare to pay and do you know the reason? Is there some kind of modifier we should be putting on these? I don't think we did with the G code we used prior to 2017. Help!!