YSK: In the US, hospitals are required to help pay for your medical bills if you make under a certain amount of money (typically 200-300% of the Federal Poverty Level). This could potentially cover the entirety of your hospital bill.
from /r/YouShouldKnow
YSK：在美國，如果你的收入低於一定數額（通常是聯邦貧困線的200-300%），醫院必須幫助支付你的醫療費用。這有可能涵蓋你的全部醫院賬單。