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Missouri House Bill 1646 modifies evidence rules for collateral sources and medical care costs in personal injury cases

Original title: COLLATERAL SOURCE RULE

Last action · May 15, 2026: Referred: Emerging Issues(H)Sponsor: Matthew Overcast

Introduced
Committee
Floor Vote
Passed
Law

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What This Bill Would Do

House Bill 1646 permits any party in a personal injury, bodily injury, or death action to introduce evidence of the actual cost of medical care, defined as the amount paid plus remaining financial obligations after contractual discounts or write-offs. It prohibits introducing the initial billed amount for medical care if it has been discounted or satisfied for less than that amount. Additionally, the bill outlines rules allowing defendants to deduct pre-trial payments made for from a final judgment.

Why it matters

Personal injury plaintiffs and defendants face modified evidentiary standards regarding what medical expenses can be presented to a jury, potentially altering damage awards and the admissibility of discounted medical bills.

Who It Would Affect

Groups the bill's text would affect if enacted, as described in the record. Being affected is not a position for or against it.

Directly affected

Plaintiffs in personal injury, bodily injury, or death actions

Plaintiffs are subject to new evidentiary limits regarding what medical expenses and costs can be presented at trial.

Directly affected

Defendants in personal injury, bodily injury, or death actions

Defendants are entitled to introduce evidence of actual medical costs and receive judgment credits for pre-trial damage payments.

Directly affected

Insurers

Insurers making pre-trial payments on behalf of defendants are tied to the credit and offset provisions governing special damages.

Key Facts

You don't have to trust us. Each fact below is taken straight from the official document - click any one to see the exact passage, highlighted in the original.

Frequently Asked Questions

Can a plaintiff introduce the full amount billed for medical care if it was discounted?
No. The bill prohibits introducing evidence of the amount billed for medical care if that amount has been discounted pursuant to a contract, price reduction, or write-off, or satisfied by payment of a lesser amount.
What is included in the definition of the actual cost of medical care under this bill?
It is defined as the sum of money paid by or on behalf of the plaintiff, plus any remaining financial obligation necessary to satisfy the provider (including valid outstanding liens) after adjusting for contractual discounts, price reductions, or write-offs.

What else do you want to know?

News Coverage

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Where This Stands

Currently in committee. The next step in the legislative lifecycle is Floor Vote.

Procedural history

4 actions
  1. May 15, 2026HouseCommittee
    Referred: Emerging Issues(H)
  2. Jan 8, 2026HouseFloor
    Read Second Time (H)
  3. Jan 7, 2026HouseIntroduced
    Read First Time (H)
  4. Dec 1, 2025HouseIntroduced
    Prefiled (H)

Version history

Only one version on file - nothing to compare yet. As later stages (committee substitute, engrossed, enrolled) are captured, the redline appears here.

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Lobbying Activity

No state lobbying filings in our records match this bill. Federal lobbying reports (LDA) cover Congress, so they are not listed on state bills.

Full breakdown

Who this bill affects and the strongest case for and against it, written only from the bill’s own text.

Sponsors

Connected Entities

Joseph Engler, General Assembly, Matthew Overcast
PersonJoseph Engler“Chief Clerk”Map →
OrganizationGeneral Assembly“Legislative body of the state of Missouri”Map →
PersonMatthew Overcast“Representative for District 155 who introduced House Bill 1646”Map →

Sources

Analysis Score

0–100
  • Significance50
    How much this matters to a regular citizen
  • Controversy60
    Intensity of disagreement among stakeholders
  • Entertainment5
    Compellingness for a non-policy-wonk reader
  • Buzz25
    Current news / social attention level

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