Referring patients to MD Anderson for cancer screening or treatment is easy. Referrals can be made by: Phone: Call our Referring Provider Team at 1-877-632-6789 and select option 1. Our health information specialists are available to assist you Monday through Friday, 8 a.m. to 11 p.m., CST and weekends and holidays from 8 a.m. to 7 p.m. CST..