My (new) LLND ordered testing through LabCorp that included a test for Bartonella and also a CD 57. My insurance has SOME of the LabCorp facilities as preferred providers. So, I checked to see which ones and then drove (6 hours) to the closet one that would be covered. It was worth it for us financially as the dr ordered a total of 14 tests (from routine bloodwork to CD 57, etc) to the tune of $2700. Even with our 12 hour roundtrip drive and an overnight motel stay, it was still financially worth it for us.
This whole insurance "thing" is so vexing - on top of everything we're all having to deal with and navigate through. I realize how incredibly fortunate I am to have this much covered for the most part, thus far.