When Can I Use My Medicare? 
This is a good question . You can use your Medicare card when it is effective , If you look at your red , white and blue card it will show Part A and Part B effective dates on the card . You can use your card at the doctors office , hospital , etc. if you are on original Medicare , that is , you only have Medicare part A and part B . If you have a Part C plan -LRB- Medicare Advantage -RRB- you will use that card instead . 