Do I have to pay a hospital bill if I recieved the bill after one year of hospitalization?

Yes.  Generally speaking it may take that long to deal with all of the insurances.  I would ask for an itemized billing showing the insurance payments.  It is a legitimate debt and if not paid they can start collection efforts.  If it is a  state-owned facility they can also intercept your state tax refunds.   Call them and make a payment plan if you cannot afford to pay the entire amount in one payment.   Depending on your financial ability to pay and if you are significantly impacted by other debts you may be able to ask them to forgive it.   If you are thinking of filing bankruptcy for other reasons, this debt could be included; if that is the case, seek competent bankruptcy counsel to discuss your options.