I think schools are very understanding of medical costs. It isn’t just the unpaid (by insurance) costs, but a lot of other costs too. When my daughter was born, she spent 89 days in the hospital. 100% of her bill w s paid, but there were 89 days of parking, 89 days of eating 3 meals a day at or near the hospital, extra fees and cost, lost time from work. It’s just expensive to have medical problems.
In your case you may have had extra Uber fees because you couldn’t drive, co-pays for specialists or tests, over the counter medications. It really adds up fast.
I’d contact the school or schools and ask them about it. It may only be a couple thousand, but that would help too.