Earlier quoted context omitted.
As a UK resident, I find that distressing. The idea that needing medical treatment might impoverish me or poverty leaves me unable to obtain the treatment I need seems exceedingly cruel.
He's not going to pay $24k. Either he has insurance to cover most of it or he'll just not pay it. Bill collectors can't harass you for medical debts. Hospitals have to treat you regardless of your ability to pay. The whole situation is far from optimal though.
A Google search lead me to the Illinois State AG's website, which claims bill collectors certainly can attempt to collect medical debts. So your claim might only be true in some states (or none at all...)