Mo. Rev. Stat. § 287.400

Upon receipt of notice of any accident for which compensation other than that provided in section 287.140 is payable, the division shall inform the employee generally of his rights under this chapter. The employer shall notify the division as soon as payment of compensation is commenced and when terminated, and shall file with the division, at the time of notice of termination, a physician's report. In the event a dispute arises between the employer and the employee regarding the payment of compensation, the division shall assist the employee in filing a claim and securing an early adjudication thereof.