Mo. Rev. Stat. § 376.1502: Requirements for transaction of business.

1. It is unlawful to transact business in this state as a discount medical plan organization, unless the organization is a corporation, limited liability corporation, partnership, limited liability partnership or other legal entity organized under the laws of this state or, if a foreign entity, authorized to transact business in this state, and is registered as a discount medical plan organization with the director or duly authorized by the director as an insurance company, licensed health maintenance organization, licensed group health service organization, or licensed third-party administrator.

2. An individual person, employee, or agent of a registered entity described in subsection 1 of this section may also transact business in this state on behalf of such entity.