Neb. Rev. Stat. § 68-941

(1) A civil action under the False Medicaid Claims Act shall be brought within six years after the date the claim is discovered or should have been discovered by exercise of reasonable diligence and, in any event, no more than ten years after the date on which the violation of the act was committed. (2) In an action brought under the act, the state shall prove all essential elements of the cause of action, including damages, by a preponderance of the evidence.