Someone drove into my sister's boyfriend & the guy who hit him doesn't have insurance/license anything... what about the medical bills?

So a couple weeks ago a drunk driver hit my sister’s boyfriend (they live together) while he was on his bike. The driver didn’t have a license or insurance & my sister’s boyfriend needed to have hip surgery as a result.

Does anybody know what the two of them should do about the medical bills? Is there any way they can get money to cover this either from the state (Tennesse) or the man who hit them?