Missouri now has a bill in the pipeline that will require insurers to inform vehicle owners of the right to choose the repair shop of their choice. At the moment a vehicle owner states they have chosen a repair shop, the insurer would not be allowed to try to refer them to another shop.  This bill at first glance appears similar to many other states and that of California. 

Additionally, there is some language regarding appraisers. Appraisers must be licensed to working in Missouri and the estimate cannot be altered by anyone unless it is physically inspected by the person writing it.  Attached is the link to the bill summary and full text link for all of the details.  SB775 Link