Now, I would like to share some things with you that I learned along this journey. The price for the exams and products can add up. To help offset the cost, my doctor and son’s pediatrician signed a letter with a list of the products with our medical issue(s) stated at the top. If you explain to your doctor that it will be used only for tax purposes, you should have no problem getting that signature and you can write off the expense on your tax return.