The Missouri Court of Appeals for Eastern District recently reinforced insurers’ ability to limit uninsured motorist (“UM”) stacking through clear policy language in Mandie Brown v. State Farm Mutual Automobile Insurance Co. The decision serves as an important reminder that, while Missouri generally permits UM stacking, insurers can limit UM stacking to statutory minimums through clear and unambiguous policy language.
Background
Mandie Brown insured four vehicles under four separate State Farm automobile policies. The Declarations for each policy listed $100,000 in UM coverage. After Brown was injured in a collision caused by an uninsured motorist while driving one of those vehicles, she sought to stack the full UM limits across all four policies, seeking a total of $400,000.
State Farm paid $100,000 under the policy covering the vehicle involved in the accident. However, for the remaining three policies, State Farm paid only $25,000 each (the statutory minimum under Missouri’s Motor Vehicle Financial Responsibility Law). In doing so, State Farm relied on a UM exclusion (step down provision) contained in an endorsement on each policy which limited UM coverage to the statutory minimum when the insured was injured while occupying an owned vehicle not designated as “YOUR CAR” or a “NEWLY ACQUIRED CAR” on that policy’s declarations page.
Brown sued for State Farm breach of contract, arguing that the policy language was ambiguous and that she was entitled to stack the full UM limits. State Farm moved for summary judgment, arguing that the UM exclusion/step down provision unambiguously limited UM coverage to $25,000 for each of the three vehicles which were not involved in the accident. The trial court granted summary judgment to State Farm, and Brown appealed.
The Appellate Court’s Ruling
The Missouri Court of Appeals for the Eastern District affirmed. The Court reiterated that Missouri law allows UM stacking but also allows insurers to limit stacking to statutory minimums through clear and unambiguous policy language. Reviewing the policies, the Court found no ambiguity in Declarations, the definition of “YOUR CAR” or anywhere else in the UM exclusion/step-down provision.
Each policy insured only one vehicle, expressly identified as “YOUR CAR” on the declarations page. When Brown was injured while driving a different insured vehicle, the exclusion plainly applied, limiting UM benefits under the non‑involved vehicle policies to the statutory minimum. The court emphasized that declarations pages summarize coverage but do not independently grant coverage beyond the policy’s operative terms.
Because the exclusion reduced—rather than eliminated—coverage and was consistent with Missouri law and public policy, it was enforceable as written. Summary judgment for State Farm was therefore proper.
Brown v. State Farm reinforced the longstanding principle of policy interpretation that a court must enforce unambiguous policy language as written and cannot unreasonably distort policy language or exercise inventive powers for the purpose of creating an ambiguity that does not exist. It also continues a recent line of Missouri appellate decisions upholding owned‑vehicle exclusions in both the UM and UIM context when policy language is clear and unambiguous.