I am betting you could find this information if you wanted to. And, I don't want you too get mad at me, but, do you notice a subtle bias in your comments that the hospital staff might automatically assume a black might not pay up like a white would? I spent 11 hours overnight in the ER in UIHC recently. I saw all kinds come in and out, but nobody was turned away, and I assume most of us got the same care and attention due to the stated mission of the hospital.
There were people like me who have excellent insurance. They're people who were clearly homeless. There was a young couple who went into the bathroom and came out in an altered state. There was Gary and Maurice who I learned from overhearing conversations are frequent visitors. Gary clearly knows the rules and pushed up them as he made a lot of people uncomfortable, just not enough to get kicked out, even though I saw a U cop go up to him 3 times. We were all treated. The system is stressed, the staff was overworked, but even Gary and Maurice were treated competently and compassionately.