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? How long will it take for my order to arrive? Does the Birch Mattress require a foundation? Does Birch offer a wholesale program?