Medical Malpractice Laws in Missouri (2026): Deadlines & Caps

Missouri medical malpractice claims run on a strict two-year deadline, require an affidavit from a qualified health care provider, and are subject to noneconomic damage caps that were struck down in 2012 and then reinstated by statute in 2015. This page explains the current law for 2026, with each key figure traced to Missouri statutes and the state's official figures. It is general legal information, not legal advice.

The Deadline to Sue (Statute of Limitations)

Under Missouri Revised Statutes section 516.105, an action for damages for malpractice, negligence, error, or mistake related to health care must be brought within two years from the date of the occurrence of the act of neglect complained of. Missouri is an occurrence state, which means the clock generally starts on the date of the negligent act itself rather than when the patient later discovers the harm.

Because there is no broad discovery rule, the two-year period can expire before a patient realizes anything went wrong. That makes early review of the timeline important.

There are narrow exceptions. When the negligence involves a foreign object negligently left in the body, or a failure to inform a patient of test results, the two-year period runs from the date the negligence is discovered or reasonably should have been discovered, whichever is first.

Deadlines for Minors

Section 516.105 sets a separate rule for children. A minor who is less than eighteen years old has until his or her twentieth birthday to bring a medical malpractice action. Parents and guardians should confirm the specific deadline with counsel, because the rule is narrower than the general tolling that applies to other claims by minors.

No Separate Statute of Repose

Missouri's malpractice statute does not include a distinct statute of repose. Under section 516.105, the two-year occurrence deadline described above is itself the outer limit for most adult patients, since the statute measures from the date of the act of neglect rather than from discovery, except for the narrow discovery-based exceptions described below.

The statute's only discovery-based extensions are the two narrow exceptions for a foreign object left in the body and a failure to inform a patient of test results, both running two years from discovery with no separate outer deadline stated in the text. Minors are treated differently: a patient under eighteen has until his or her twentieth birthday to sue, which functions as their own hard outer limit.

Damage Caps and the Watts Decision

Missouri caps noneconomic damages, meaning pain, suffering, and similar nonmonetary losses. The history here matters. A 2005 cap of $350,000 was held unconstitutional in Watts v. Lester E. Cox Medical Centers, 376 S.W.3d 633 (Mo. banc 2012), because it violated the right to trial by jury for common-law claims under the Missouri Constitution.

The legislature responded in 2015 with Senate Bill 239, which created a new statutory cause of action for personal injury or death against a health care provider and reinstated the cap in that statutory form (RSMo 538.210). Because the reinstated cap applies to a statutory rather than a common-law claim, it has been upheld since. The cap is in force in 2026.

The reinstated cap has two tiers and increases by 1.7 percent every January 1, with figures published by the Missouri Department of Commerce and Insurance. For 2026 the cap is $481,493 for non-catastrophic personal injury and $842,614 for catastrophic injury or wrongful death. Because the amounts change each January, confirm the figure for the year in question.

What the Cap Does and Does Not Limit

The cap applies only to noneconomic damages. Economic damages, including past and future medical expenses, lost wages, and lost earning capacity, are not capped. Whether the higher catastrophic tier applies depends on the statutory definition in RSMo 538.205, which covers conditions such as quadriplegia, paraplegia, loss of two or more limbs, significant and permanent cognitive impairment, irreversible failure of a major organ, or significant loss of vision.

Affidavit of Merit

Missouri requires a screening affidavit after suit is filed. Under RSMo 538.225, the plaintiff or the plaintiff's attorney must file an affidavit stating that they have obtained the written opinion of a legally qualified health care provider who believes the defendant failed to use the care a reasonably prudent and careful provider would have used under similar circumstances, and that this failure caused the damages.

The affidavit must be filed within ninety days after the petition is filed, and the court may extend that period for good cause by up to an additional ninety days. A legally qualified health care provider is one licensed in the same profession as the defendant and actively practicing substantially in the same specialty. Failing to file the affidavit can lead to dismissal without prejudice.

Pre-Suit Notice

Missouri does not require a separate pre-suit notice of intent to sue and does not use a mandatory medical-review or screening panel. The gatekeeping step is the affidavit of merit under section 538.225, which is filed after the petition rather than before. This distinguishes Missouri from several neighboring states that require pre-suit notice.

Standard of Care and Who May Be Liable

A Missouri medical malpractice claim turns on whether the provider used the degree of skill and care that a reasonably prudent and careful health care provider would have used under the same or similar circumstances. Section 516.105 lists the covered providers, including physicians, hospitals, dentists, nurses, optometrists, podiatrists, pharmacists, chiropractors, physical therapists, and other entities providing health care, along with their employees. Hospitals may also be vicariously liable for staff.

Expert testimony is generally required to establish the standard of care, the breach, and causation, because these are matters beyond a lay jury's knowledge. Expert admissibility is governed by RSMo 490.065, which since 2017 follows the federal Daubert standard.

Comparative Fault

Missouri follows pure comparative fault, adopted by the Missouri Supreme Court in Gustafson v. Benda, 661 S.W.2d 11 (Mo. banc 1983). A patient who is partly at fault can still recover, but the award is reduced in proportion to the patient's share of fault. Even a plaintiff found mostly responsible may recover the remaining percentage, which distinguishes Missouri from states that bar recovery at 50 percent fault.

Wrongful-Death Medical Malpractice

When malpractice causes death, the wrongful-death claim is governed by RSMo 537.080 and 537.100. The deadline is generally three years from when the cause of action accrues, which is typically the date of death. The statute sets a tiered list of who may sue, beginning with the spouse, children or their descendants, and parents, then siblings or their descendants, and finally a court-appointed plaintiff ad litem if no closer relatives survive. The noneconomic cap on death cases follows the higher catastrophic tier, which is $842,614 in 2026.

How to Evaluate and Preserve a Possible Claim

If you believe medical care caused harm, request complete medical records promptly and write down the timeline while details are fresh, because the two-year occurrence deadline can run quickly. Most Missouri medical malpractice attorneys offer a free initial consultation and work on a contingency fee, meaning the fee comes from any recovery. No attorney can guarantee an outcome or a dollar amount, and every case depends on its specific facts and the governing deadlines.