Mo. Rev. Stat. § 191.1164
2. As used in sections 191.1164 to 191.1168, the following terms shall mean:
(14) "Urgent health care service", a health care service with respect to which the application of the time period for making a nonexpedited prior authorization, in the opinion of a physician with knowledge of the enrollee's medical condition:
(L. 2019 S.B. 514)