. . . Well, its ER expenses have to be very high because of its being cheek by jowl with high-crime Austin neighborhood.

That said, the bad news, from Patch:

Overall, Rush Oak Park Hospital bills Medicare on average less than the U.S. average, while the West Suburban Medical Center bills one to two times more than the U.S. average for treatments, according to a database compiled by New York Times, which is searchable by ZIP code or state.

It’s more expensive to serve some neighborhoods.