Having known multiple Anesthesiologist partners that work for Pinnacle in the DFW area I can say that what DocD5 says pretty much is the nail on the head. Each of the groups under Pinnacle seem to have their own way of setting up their partner tracks, compensation model, etc....so some groups could be shady, but far from most. Basically set up like a loose federation with a majority of the decisions being made by the individual groups under the Pinnacle umbrella, which like DocD5 said essentially sold their billing rights to EMCARE for a couple hundred K per partner so basically each year you lose 1 or 2% of revenue for that lump sum up front.
This means your groups area payor mix will depend on your income with some partners raking in mid to high 400 and other groups on the high side of 700k currently. All of this is just what I have overheard from buddies as I don't work for them...but would entertain a spot as a future Anesthesiologist