Minnesota bars UM/UIM stacking by statute and makes underinsured coverage an add-on
Minnesota's rules are in Minn. Stat. 65B.49: subdivision 3a requires separate UM and UIM coverages and bars stacking, and subdivision 4a makes underinsured coverage an add-on. The underinsured definition is in 65B.43, the pain and suffering threshold in 65B.51 and the general deadline in 541.05.
Read how stacked and single-limit coverage differ in Minnesota, check what subdivision 3a says, or see how Minnesota UM and UIM work under no-fault.