You might wonder just what that document you get from Tricare after you receive any type of medical care actually is. That document is known as an Explanation of Benefits (EOB), and it is not a bill. The Tricare EOB is an itemized statement showing what action Tricare has taken on your medical claim. Why is it important? The EOB is your main documentation if you want to file an appeal. If you think you were charged for something that you shouldn't have been, or if a treatment was listed that you didn't receive, your EOB will be the place where you see it first. You may receive bills from a hospital for something that Tricare paid for. If so, your EOB will help you fight the bill collectors. Learn more about what's in your EOB on Military.com.