This is one of United Healthcare's many phone numbers. If you have United Healthcare, then it's not a scam call. I have UHC, so they were calling me regarding a prescription issue I've been dealing with for the last 3 weeks. If you don't have United Healthcare and you're receiving calls from them, then I suppose it would be a scam in your case.
I believe this is United Healthcare and probably a legitimate call. The call came while I was out but no message was left, which is senseless of UHC: they should have identified themselves at least and left a call-back number. The reason I believe it's UHC and legitimate is that I have an ongoing dispute about a denied claim with them. They're probably calling to discuss it. Again, though: Leave a message!
763-200-9605 is the number used by a healthcare worker for United Health Care and medicare plan. They call periodically to see if you have questions about changes in the plan, to see if you have scheduled your annual wellness checkup, your housecalls checkup and if all is ok with your healthcare provider and medicines. They only call people who have the plan or that person legal representative. If you don't have it or just don't wish to be called then call 888-288-9945 and ask them not to call you.