If you were hurt in the St. Louis region, one of the largest variables in what happens next is not your injury. It is which side of the Mississippi you were standing on.

Missouri and Illinois answer three basic questions differently: who chooses your doctor, whether you can recover at all, and how much your own share of fault costs you. Two people with identical injuries in the same week, two miles apart, can end up in very different positions.

If you were driving uninsured in Missouri

This is the one that surprises people most, and it is worth knowing before you assume you have no claim — or that you have a full one.

Under RSMo 303.390, an uninsured driver is barred from recovering non-economic damages. That is pain, suffering, and loss of the life you had. The bar applies even when the collision was not your fault.

Two things matter enormously here, and both are routinely misstated:

It bars non-economic damages, not everything. Economic damages — medical bills, lost wages — are not addressed by that section. Anyone who tells you an uninsured driver “cannot get compensation” has overstated the statute.

There are exceptions, and the statute has been contested. The section does not apply where the collision was caused by a driver under the influence, or one convicted of involuntary manslaughter. Missouri courts have seen constitutional challenges to the provision, and the Missouri Supreme Court declined to resolve the question in a 2023 case because the argument had not been preserved for review. It remains on the books.

What this means practically: if you were uninsured, the economic side of your claim still has to be documented properly, and the documentation carries more weight than usual — because the subjective half of the claim may not be available to you.

If you were hurt at work

Here the two states diverge in a way that directly changes your medical care.

In Missouri, under RSMo 287.140, the employer — in practice the employer’s insurer — directs your treatment and selects the treating physician. You may see a physician of your own choosing, but at your own expense.

In Illinois, under 820 ILCS 305/8(a), the injured worker may select up to two medical providers, and referrals made by those providers are covered.

That is not a technicality. It determines who decides which specialist you see, when imaging gets ordered, and when you are declared to have reached maximum medical improvement. Same injury, same week, two miles apart — two different medical realities.

If you were partly at fault

Both states reduce an award by the injured person’s share of fault. Only one of them lets that share end the claim.

Missouri applies pure comparative fault. Under Gustafson v. Benda (1983), Missouri abandoned contributory negligence for the Uniform Comparative Fault Act approach. A plaintiff found 99% at fault can still recover, with the award reduced accordingly.

Illinois applies a modified rule with a 51% bar. Under 735 ILCS 5/2-1116, a plaintiff whose share of fault reaches 51% recovers nothing at all.

The Illinois rule creates a cliff rather than a slope. At 50% fault an award is halved; at 51% it is gone. That single percentage point is often the whole argument in a contested liability case — and what determines which side of it you land on is usually the quality of the contemporaneous record, not the eloquence of the closing.

What Missouri law says about how insurers must behave

Missouri also has a statute on claims conduct: RSMo 375.1000 through 375.1018, which defines improper claims practices. It reaches misrepresenting facts, failing to investigate, refusing to settle without a reasonable basis, and unreasonable delay.

One detail is worth knowing: the statute is written to reach claimants and insureds — not only the person who bought the policy. An injured third party is inside that language.

Be precise about what that does and does not mean. The act is enforced through the Missouri Department of Commerce and Insurance. Whether and how it supports a particular argument in a specific claim is a question for your attorney, not for a physician and not for a web page.

Why this lands on the medical record

Every one of the rules above is decided on documentation.

Whether an uninsured Missouri driver recovers their economic damages depends on how well those damages are evidenced. Whether a Missouri work-injury patient gets the imaging that shows the problem depends on what the treating physician — chosen by the insurer — actually orders and writes down. Whether an Illinois plaintiff sits at 49% or 51% often turns on dated, specific findings recorded close to the event.

This is the practical reason we treat intake as the most consequential appointment rather than a formality. How you were hurt, and where, determines what your medical record has to prove. How the record is scored once the claim is filed

Frequently asked questions

Can an uninsured driver recover anything in Missouri?

Who chooses my doctor in a workers’ compensation claim?

What happens if I was partly at fault?

Does Missouri law require insurers to deal fairly with an injured third party?

Where is Injury Experts located?

Key takeaways

• RSMo 303.390 bars non-economic damages for an uninsured Missouri driver — not
• Missouri employers direct work-injury care (RSMo 287.140); Illinois workers choose two
• Missouri is pure comparative fault; Illinois bars recovery at 51% (735 ILCS 5/2-1116).
• RSMo 375.1000–375.1018 reaches claimants, not only insureds, and is enforced through the
• Every one of these rules is decided on the contemporaneous medical record.

Verified sources

1. RSMo 303.390 — bars recovery of non-economic damages by an uninsured motorist;

exceptions for intoxicated drivers and involuntary manslaughter convictions. VERIFIED. Constitutional challenges have been litigated in Missouri; the Missouri Supreme Court declined to reach the question in Bridegan v. Turntine (2023) on preservation grounds. Owner/counsel: confirm current status before relying on this in a matter.

2. RSMo 287.140 — employer/insurer selects the treating physician; employee may choose

their own at their own expense. VERIFIED against revisor.mo.gov.

3. 820 ILCS 305/8(a) — injured worker may select two medical providers; referrals from

them are covered. VERIFIED.

4. Gustafson v. Benda, 661 S.W.2d 11 (Mo. banc 1983) — Missouri adopts pure comparative

fault. VERIFIED.

5. 735 ILCS 5/2-1116 — Illinois modified comparative negligence, 51% bar.

VERIFIED.

6. RSMo 375.1000–375.1018 — improper claims practices; § 375.1007 enumerates the

prohibited acts and refers to “claimants and insureds.” VERIFIED against revisor.mo.gov. Enforcement runs through the Missouri Department of Commerce and Insurance; the post deliberately does not assert a private right of action.