Apparently https://khn.org/news/a-jolt-to-the-jugular-youre-insured-but-still-owe-109k-for-your-heart-attack/ https://khn.org/news/a-jolt-to-the-jugular-youre-i

Apparently https://khn.org/news/a-jolt-to-the-jugular-youre-insured-but-still-owe-109k-for-your-heart-attack/ https://khn.org/news/a-jolt-to-the-jugular-youre-insured-but... although this one is for $100k; not sure what drives it higher. I won't copy it here, but search that page for "surprise bills", "balance billing", and "loophole".