Can I be sued by a hospital for a bill after they sent the claim to the wrong insurance company?

Question Details:

In 2006 wife went to emergency room at a hospital. We submitted our insurance info to the billing office. The bill was sent to the wrong insurer. The claim was denied. We went back to the billing office and gave our info a second time. Again the billed our insurance company. Info giving to billing a third time. We followed up about 3 months later and was told everything was taken care of.Now, 4 years later we get a summons telling us we are being sued for this old bill. They also want 4 years worth of interest plus court costs.

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