You're lucky, if they really want to give you a heart attack, you would have seen the first pass bill they sent to the insurance company. I bet it would have been close to twice that, but insurance companies fight back, saying they'll only pay "X" for things. You should be glad that your insurance company negotiated so well that it only means you're paying $150!!
Medical expense way out of control in our country. Lucky for you that you have great insurance.