Sadly, as far as I understand it, that only applies to certain conditions (and it may differ by state...my State Dept of Insurance clarified this for me). I was seeing mine twice a week (beginning of the year I had called my ins. comp., and they had said I had "unlimited" visits for the year)...til my insurance company called my therapist for a "case review". They deemed it "not medically necessary" after speaking with my therapist and cut back the number of visits they would cover to once a week. I was going to have to appeal it in order to maybe get another "consideration", which I did not do yet because the insurance company wanted to talk to my therapist again a month from their decision (which will be in a few weeks)...I wanted to save the appeal for if they decided to cut back their coverage even more, like twice a month.
This site is good for info, and my local branch was really nice when I called:
http://www.nami.org/
My State Dept. of Insurance sent me a lot of great info, too.