Good morning Vickie,
Mayo clinic is the leading founder in the indusrty on genetic testing and more specificlly parmacogenetic testing. Mayo acct services will help with the insurance coverage. But the doctor could always ask laboratory services. You can share this link with him/her.
http://mayoresearch.mayo.edu/center-for-individualized-medicine/drug-gene-testing.asp
One of the nice things about this test is that it is a once-in-a-lifetime test. You don’t need to repeat it because it’s showing which drugs your genes can and cannot break down and that is based on your DNA.

Another valuable part of getting this test done is that the last page has a summary of all your genetic polymorphisms i.e. which pathways work well genetically and which pathways don’t. If you are stuck in an emergency room, you can give this to the emergency doctor who could cross-reference it with drugs that would be appropriate for you in the ER.
We use this in our facility daily. We have better healthcare outcomes, decreased hospital visits, happy patients that are being treated with less medications and reduced cost of medications.