Why can’t I use my card at this doctor? November 22, 2022 15:15 Updated It may be that the provider is not a covered physician or practice. Call BlueCross at 833-578-1125 and we may be able to identify the exact reason. Related articles Why is my card not working? Can Blue Rewards dollars be used on dental or vision expenses? Will I be required to fill out forms regarding use of reward dollars? Can reward dollars be used at the doctor’s office? Do reward dollars have to be used by the same member who earned them?