An identification card, similar to a credit card, proposed in several national health insurance bills, which would be issued to each covered individual or family unit. This card would be presented at the time services were rendered in lieu of an}’ cash payment. The individual would subsequently receive a bill for any cost-sharing not covered under the insurance plan. Health cards, it is said, would simplify eligibility determination, billing and accounting, and the stud}’ of use of services. The idea presents interesting confidentiality problems, particularly under the Federal Credit Disclosure Act.