Webunitedhealthcare ucard is a member id and much more. Many members can show their ucard when they visit a provider, fill a prescription at a pharmacy, and go. Webcheck your card balance. Quickly and easily check the balance on your card without logging into your account! Simply enter your card number and security code, which may. Your unitedhealthcare ucard® is your member id and much more. Only the ucard gives you access to a large national.