sometimes on a state website it will list the basic structure, and then list the severity increments. that might give you *some* idea. i agree....zebramom is in "the know."
it also seems to me that if no one knows the severity of his needs, someone should get on the ball about figuring those out. hopefully they have helped you in setting up some appointments? (please say yes.
are you adopting him? if so, i'm pretty sure every state has full disclosure laws which means they need to figure out what is wrong, and then tell you everything they know, before you sign adoption placement papers. that may help, too.
sometimes dx get missed in the initial stages as well, so know that speciality foster rates and aap are negotiable if the new dx warrants it. it is always worth it to ask if something comes up.