If you need a new Unitedhealthcare card sent to you, you can go to there website myuhc.com, log in to your account and select “ID Card" and then request a new UnitedHealthcare card be mailed to you.
You can also contact Unitedhealthcare customer service at their phone number 1 (866) 414-1959 and request they send you a new Unitedhealthcare card through the mail.