An absurd medical bill

In July I was taken from the hospital where my surgery was done to the hospital where my ReHab was to occur.

I just got a bill for the ambulance ride. I was kind out of it so I don't remember it - but I think there were 2 people - driver and attendant and I was lying on a bed.

The insurance company paid $362.65
I pay $50

The bill had two items with these values - then adjusted by the insurance company to meet the above total:
1 NonEmg Base Rate $1,646.39
17 Mileage $1,224.00
---------------
$2,870.39

So they get 14% of what they originally billed.
And they charge $72 / mile

Another one of the absurdities of the US medical care system
I wonder if anyone ever pays the list price.