Does the hospital have the right to ask me for the baby delivery costs even if I was covered 100% under a maternity plan?

Question Details:

Delivery was on  8/23/08. Plan: flexible Blue Cross of MI with maternity; with deductible $1500. I already met the deductible at that time. The insurance saying one time they already paid and one time that the hospital submitted the wrong claim. Now the hospital lawyer asking me for the baby costs.

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