Lab Draw Bill

Anyone paid a MaterniT21 test out of pocket? They did mine last October and now just sent me the bill. I have 2 insurance--one thru the hospital I work for and one from TriCare. Find out Tricare paid $20 and the other did not pay anything at all. My bill is $834 for ONE blood work. How in the world? And guess what? It was a misdiagnosis and didn't even need the blood work in the first place. What the heck