Dr. M Hanes in The Woodlands is my doctor and accepts Amerigroup
It is a B to get an appointment, so call and schedule asap if you decide you like her after reading reviews and whatnot.
I am early in my pregnancy and have only had one appointment with her. It was enjoyable and gave me a good impression. I liked all her staff as well with the exception of the person who took my blood, she was preggers and just not having a good day, and came off as very unpleasant.
If the woodlands is not in your area I do have a copy of the Amerigroup doctors list here and can PM you a list of doctors in the area you are comfortable with.