Can I use more than one discount code? April 23, 2021 13:45 No, you will not be able to combine discount codes on your order. Each order is limited to one discount code. Related articles I forgot to use my promo code. Does Birch offer any military discount, teacher, student, or first responder discount? Does the Birch Mattress require a foundation? How long will it take for my order to arrive? What is the warranty for Birch Mattresses?