Do you have health insurance and understand how it works? You seem really confused.
For example, I have health insurance. I'm with an HMO. I get to pick my PCP (primary care physician) and he deals with everything. When I'm sick, I see him. If I need a recommendation for something, I ask him and he gives a form to my insurance, telling them to cover whatever procedure I need. I also have an insurance card so that any hospital can see that I am covered and that all expenses will be paid. It's a way of communicating back and forth between my insurance carrier and whoever will be needing payment for any services rendered. This card is vital as a way of identifying my membership and my ability to have everything paid for.
Now, when the health plan passes, NOTHING changes for me. I still have the SAME insurance, the SAME doctor, everything. I see no difference. My carrier will still be the same.
But, if you have NO insurance, you CAN get on the government plan. If you're on this plan, you will get a CARD, like the one I have with my insurance plan. This card will tell the hospitals and doctors that you are a legitimate carrier an it serves as proof that payment will be rendered. If they need more information, they can get real-time access to your insurance information (what is covered, what is not, etc...) from an account number on that card. It's the exact same as what I have. A card, an account. The card is machine readable, as they have been for years now. The system will be the same.
The reason why I assume you have no insurance (or that your g-ma takes care of it) is because this is common practice for ALL insurance. They always check what is covered at what place and always pre-certify before any major procedure. Do you understand how this is no different? Ask other people with insurance. It's the same. They have a card and that card has a number on it. That account number allows the doctors to access what is covered and paid for by you and by your insurance company. It's so simple and intuitive. It's been around for a LONG time.