Medicare covers the test for MTHFR polymorphism, too.

Unfortunately, there are no Medicare Part D plans that cover Deplin (L-methylfolate), although I believe some private insurance plans cover it. I have the homozygous C677T mutation, and Deplin is the only medication that's ever touched my depression. It was a miracle drug for me, but I can't afford it on my extremely limited income.

ETA: If you want to be tested for MTHFR polymorphism, be sure to request that test specifically. Don't let the doc just test your folate level. Assuming you have adequate dietary intake of folate, your blood level will be normal. The problem is that people with the mutation can't process the folic acid and break it down correctly.

Also, 23andme can no longer offer health reports due to an FDA ruling last year. However, they do give you the raw genome data, and there are third-party sites that offer limited health reports. You just can't get it straight from 23andme anymore, and the third-party sites give you a TON of data to sift through, with little indication of what's significant and what's not.