two ins. co. rule ???

Does anyone know about the law that says if you have two insurance companies and one doesn't cover WLS but the other one does then both still pay? I heard this somewhere and now I can't remember where to see if it really is true. I have been denied by my current insurance company and am starting a new job on Monday the 22nd with a company that does cover the WLS. I am hoping my original insurance co. will have to pay part of the bill. Should I consider my new insurance as my primary or secondary? Any help would be appreciated !!! Thanks, Kari

Good luck and I hope that the insurance will pay for part of the bill. My Mom's bill is huge and my Dad is paying it himself. We wish you the best Suzie-Q