HELP!!! Got a question about other insurance

I am having problems with my insurance company saying it doesn't cover the bypass surgery. I have done everything i need my next step is my nutrition evaluation then appointment with surgeon. Did my pyshic today.I have my mind set on getting surgery done. I know after all the information is sent to the insurance co. they are going to deny and then I will appeal. What i want to know is anyone after being denied by one insurance company taken out other insurance that would cover the surgery. I am willing to do that also.HELP PLEASE Marsha