Mo. Rev. Stat. § 376.453: Premium — only cafeteria plans required, when.

1. An employer that provides health insurance coverage for which any portion of the premium is payable by the employer shall not provide such coverage unless the employer has established a premium-only cafeteria plan as permitted under federal law, 26 U.S.C. Section 125. The provisions of this subsection shall not apply to employers who offer health insurance through any self-insured or self-funded group health benefit plan of any type or description.

2. Nothing in this section shall prohibit or otherwise restrict an employer's ability to either provide a group health benefit plan or create a premium-only cafeteria plan with defined contributions and in which the employee purchases the policy.