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The doctor didn't charge the health insurance in time, am I liable?
I was in a similar situation years back and I refused to pay the bill. My point of view was that I provided the hospital with all information needed to submit the claim in a timely matter and that I should not be held responsible for their failure to do so. In the end they waived the charges. So while technically I might have been responsible for paying the charges, in reality I think they decided it wasn't worth the hassle of making me (I would have fought it all the way up to the top). Not sure that I would recommend this approach though :)