Nebraska requires UM and UIM, bars stacking by statute and pays UIM as damages above the other driver's payment
Nebraska's rules are in Neb. Rev. Stat. 44-6408 (both coverages required), 44-6409 (how much the insurer pays), 44-6410 (stacking prohibited) and 44-6411 (multiple policies). The fault rule is in 25-21,185.09 and the deadline in 25-207.
Read how stacked and single-limit coverage differ in Nebraska, check what sections 44-6410 and 44-6411 say, or see how Nebraska UM and UIM work.