All 50 states have a volunteer organization established, usually through the state department of insurance, to assist people in deciding how to manage Medicare. They can look up doctors and prescriptions and guide you toward the most appropriate options for you. Most programs are called SHIP, for example OSHIIP here in Ohio (Ohio Senior Health Insurance Information Program).
You can find a link to the SHIP program in all 50 states and even some rate tables by clicking HERE.