Mo. Rev. Stat. § 379.490
May use rating plans or systems.
379.490. May use rating plans or systems. — Any rate, rating plan or rating system made or adopted by an insurer or by a rating organization licensed hereunder and any modifications and amendments thereto may be used subject to the provisions of sections 379.420 to 379.510 .
(L. 1947 V. II p. 254 § 5)