United Healthcare provides two separate cards: one for Medical and one for Dental. If you elected dental coverage, you should've received your dental card in the mail recently. It will state “Dental Identification Card” on the front.
If you changed your medical plan for this plan year, you will also receive a new medical card that will have the group number listed on the front. To ensure that you keep the correct medical card, please confirm that your card has the following group number: Base plan = Group Number 498339 and Buy Up Plan = Group Number 6R2010