Health Alliance -- in Illinois. However, I have actually changed plans, so I can go to whatever doctor I want. I do not need any referrals. My costs are somewhat higher, but I was not happy with choice of pcp's. I am a state employee (university) so we do have decent insurance. I have a colleague who is on this plan (the one I switched to), and he pays 11.00 a month for avonex. I also did not have to pay anything for tysabri when I was on it through the HMO. I may regret switching plans, but I wanted more flexibility.