I had an MRI for the Vargus nerve last year and Medicare did cover it..my nausea wasn't caused by that (have pyloric stenosis)..the neurologist said my neck was a mess..I told hiim ..I didn't even feel it.. digestive problems were so painful.. he looked astounded...but it was covered by Medicare and ChampVA..you might ask Medicare ..it was an easy test..compared to the gastro tests!! Just 45 minutes in a tube ..no sneezing.. I had a cold or something so I prayed! If you move or cough or sneeze. they have to start al over!! Praying you get some answers!!