Getting hit by a driver who has no insurance is a special kind of frustrating. You did everything right, you pay for coverage, and the person who caused the crash has nothing worth collecting. Missouri planned for exactly this. Every auto policy sold in the state has to include uninsured motorist (UM) coverage, and after a crash with an uninsured or hit-and-run driver, that coverage is often the only real source of payment.
Here is how the rules actually work in Missouri, with the specific numbers and deadlines that matter.
Missouri makes UM coverage mandatory
Missouri is one of the states that will not let you skip uninsured motorist coverage. Section 379.203 of the Revised Statutes of Missouri says no auto liability policy can be issued in the state unless it protects the people insured under it who are "legally entitled to recover damages from owners or operators of uninsured motor vehicles."1 There is no rejection form and no opt-out box on a standard personal auto policy. The coverage has to be there.
That's different from underinsured motorist coverage, which is not required (more on that below). It also separates Missouri from the states that let drivers waive UM in writing.
The required amount is at least $25,000 per person and $50,000 per accident for bodily injury, the same minimum bodily injury figures Missouri uses in its financial responsibility law.12 Those are floors, not ceilings, and most people carry UM limits that match whatever liability limits they bought. Missouri's overall minimum liability requirement is 25/50/25: $25,000 per person and $50,000 per accident for injuries, plus $25,000 for property damage.3
The mandate leaves out one thing. It covers bodily injury only.1 If an uninsured driver wrecks your car, the repair bill and any lost resale value run through your own collision coverage or a diminished value claim, not UM.
The fleet exception
There is a narrow carve-out for businesses. For a commercial motor vehicle as defined in Section 301.010, or an employer with a fleet of five or more passenger vehicles, UM coverage only has to be "offered" rather than automatically built in.1 For a family with a personal policy, that exception changes nothing. Your coverage is included whether you asked for it or not.
What UM pays for, including hit-and-run
UM applies when the at-fault driver has no liability insurance at all. It also covers two situations people often miss.
Hit-and-run crashes count even when nobody can identify the other car, and Missouri does not require physical contact between the vehicles.1 If a phantom driver forces you off the road and never touches you, that can still be a UM claim. You'll want the Missouri crash report to document it.
UM can also kick in when the other driver did have insurance, but the insurer collapses. Section 379.203 extends coverage where the at-fault driver's insurer becomes insolvent within two years of the accident.1
Underinsured coverage is optional, and works differently
Uninsured and underinsured coverage sound like the same thing. They are not. Uninsured motorist coverage handles a driver with no insurance. Underinsured motorist (UIM) coverage handles a driver who has some insurance, just not enough to pay for your injuries.
Missouri does not require UIM.4 Section 379.204 only tells courts how to read a UIM provision when a policy includes one; it does not force anyone to carry it.4 Plenty of Missouri drivers carry only the $25,000 minimum, and a serious injury can blow past that in a single ambulance ride, so UIM is worth asking your agent about even though the state does not make you buy it.
You can stack UM coverage
If you insure more than one vehicle, or hold more than one policy, Missouri lets you add the UM limits together. This is called stacking. In Shepherd v. American States Insurance Co., the Missouri Supreme Court held that anti-stacking clauses in uninsured motorist coverage are contrary to the public policy behind Section 379.203 and invalid.5 An insurer generally cannot use fine print to stop you from combining the UM limits on the cars you insure. For a household with three cars each carrying $25,000 of UM, that can mean $75,000 available instead of $25,000.
Your claim is against your own insurer
A UM claim is a contract claim against your own insurance company, not a lawsuit against the uninsured driver. The Missouri Supreme Court made that clear in Oates v. Safeco Insurance Co. of America: the UM claim is a separate cause of action, and you don't have to sue the uninsured motorist first to collect on it.6
There is a catch. Because your insurer effectively steps into the shoes of the driver who hit you, it can raise the same defenses that driver could, including the argument that you were partly at fault. Missouri follows pure comparative fault under Gustafson v. Benda, so your recovery drops by your percentage of fault but is never wiped out entirely, even if you were more than half to blame.7 A UM adjuster who pegs you at 30 percent at fault will try to shave 30 percent off the payment.
Two different deadlines
Missouri gives you two clocks here, and they run for different lengths.
A tort claim against the uninsured driver personally falls under the five-year deadline for personal injury in Section 516.120(4).8 In practice, suing someone who carried no insurance rarely produces money, which is the entire reason UM exists.
The UM claim against your insurer is a contract action. Missouri's limitations period for a suit on a written contract is ten years under Section 516.110(1).9 Do not treat that as your safe deadline. Auto policies routinely set their own, shorter window to file suit or demand arbitration, often two to five years, and Missouri courts will enforce a reasonable one. Read your policy and calendar the earliest date it names. Give your insurer prompt written notice either way.
What UM does not do
Missouri has no no-fault or PIP system, and medical payments (med-pay) coverage is optional, so UM bodily injury coverage does much of the work after a crash with an uninsured driver.3 It still won't repair your car. Vehicle damage and lost value go through collision coverage or a diminished value claim.
If an uninsured or hit-and-run driver hit you and your own insurer is dragging its feet or lowballing the offer, that's a good moment to talk to someone who handles Missouri UM disputes. You can start with the legal directory.
This is general information about Missouri law, not legal advice.
Sources
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Missouri Revisor of Statutes, Mo. Rev. Stat. § 379.203 (uninsured motorist coverage required; limits; hit-and-run; insurer insolvency; fleet exception). https://revisor.mo.gov/main/OneSection.aspx?section=379.203
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Missouri Revisor of Statutes, Mo. Rev. Stat. § 303.030 (financial responsibility bodily injury limits, $25,000 per person / $50,000 per accident). https://revisor.mo.gov/main/OneSection.aspx?section=303.030
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Missouri Revisor of Statutes, Mo. Rev. Stat. § 303.190 (motor vehicle liability policy, 25/50/25 minimum limits). https://revisor.mo.gov/main/OneSection.aspx?section=303.190
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Missouri Revisor of Statutes, Mo. Rev. Stat. § 379.204 (construction of underinsured motorist coverage). https://revisor.mo.gov/main/OneSection.aspx?section=379.204
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Shepherd v. American States Insurance Co., 671 S.W.2d 777, 780 (Mo. banc 1984). https://www.courtlistener.com/c/S.W.2d/671/777/
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Oates v. Safeco Insurance Co. of America, 583 S.W.2d 713 (Mo. banc 1979). https://www.courtlistener.com/c/S.W.2d/583/713/
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Gustafson v. Benda, 661 S.W.2d 11 (Mo. banc 1983). https://www.courtlistener.com/opinion/1787880/gustafson-v-benda/
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Missouri Revisor of Statutes, Mo. Rev. Stat. § 516.120(4) (five-year limitations period for personal injury). https://revisor.mo.gov/main/OneSection.aspx?section=516.120
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Missouri Revisor of Statutes, Mo. Rev. Stat. § 516.110(1) (ten-year limitations period for an action on a written contract). https://revisor.mo.gov/main/OneSection.aspx?section=516.110