I am assuming the kid was covered by some sort of private insurance.
That policy paid all of his medical costs, less any deductibles, copays, or service beyond contracted limits.
Anything unpaid by his parents either goes into collection or ends up written off by the hospital and the various corporations who do business there.
If you've ever seen a hospital bill, you'll know that they are just one - and often a very small - piece of the puzzle. You'll see separate bills from each doctor, anesthetist, etc...
Everyone's services and prices are marked way up, and then they actually get paid smaller "negotiated" amounts for their services from the insurance companies. It's a huge complicated process, with lots of room for bills to go unpaid and everyone still drives home at night in their late-model German autos.
Unless the kid was on Medicare, I'm very doubtful anyone in Minnesota ever sees a part of his medical bill.