The provisions of sections 23-3520 to 23-3525 are not intended to limit any preexisting rights to charge and collect for services rendered prior to the passage of sections 23-3520 to 23-3525 had by hospitals which are created and existing under the general powers of counties of this state or under the provisions of sections 23-3501 to 23-3519 and 23-3528 to 23-3572.
Neb. Rev. Stat. §§ 23-3520