Talking with your doctor is a good idea, and if you doctor isn't helpful then find another one you can talk with. I had to persuade my doc that I actually had a problem since I seemed so squeaky clean. And not all MD's are up to date on the latest on addiction/alcoholism and treatment methods.
But as someone said it can be important if you go in for surgery or if you have other conditions such as diabetes.
I found that telling my doctor was an important step in recognizing I had a problem. It meant that I couldn't "undo" it and decide to go back to drinking with nothing changing. It gave me extra incentive to be sober.