Those U.S. News chaps sure do like their lists. Must be some money in them, huh? Seems they've changed their creteria and that has resulted in a shake-up of sorts (reputation is no longer weighted). Along with ranking Michigan hospitals for their quality of care they've picked U-M in Ann Arbor (ranked 17th overall) as among the best in the nation. Beaumont in Royal Oak came in number 2 in the Mitten with 10 nationally ranked soecialities.
You can see the rankings here
Crain's has a write-up here