Call 1.866.CALL.MLH (1.866.225.5654), Monday through Friday between 8:00 am–6:00 pm ET, to speak with a member of our referral staff who can help find the doctor who is right for you. Profile. About Taro Arai, MD. Taro Arai, MD is a specialist in diseases of the colon and rectum as well as anal diseases..