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 Does Birch offer any military, teacher, student, or first responder discount? I forgot to use my promo code. How do I contact a customer support agent? Do you offer financing options? How does the 100 Night Sleep Trial work?