Sign In. See a personalized view of your Medicare benefits. New to the website? Register now to get access to tools and resources to help you manage your plan and your health. Find a doctor, medical specialist, mental health care provider, hospital or lab. Find a doctor, medical specialist, mental health care provider, hospital or lab.AARP‧Contact Us‧Plans‧About Us‧UnitedHealthcare‧Annual Notice of Medicare Advantage Plan With Prescription.