Texas Legal Glossary · Personal Injury

Maximum Medical Improvement (MMI)

Written and reviewed by Shane M. Boasberg, founder of SMB Law, PC · Licensed in Texas since 2003 · Updated October 2026

Definition: Maximum medical improvement, or MMI, is the point at which an injured person’s condition has stabilized and further material recovery is not reasonably expected. Texas Labor Code § 401.011(30) defines it for workers’ compensation, and injury lawyers use it to time a claim’s valuation.

Also called: MMI, medical plateau

What maximum medical improvement means in Texas

Maximum medical improvement is a medical judgment that you have gotten as well as you are going to get. It does not mean you are healed. It means your doctors do not expect further material recovery or lasting improvement, so what remains is your long-term condition. The term comes from workers’ compensation. Texas Labor Code § 401.011(30) defines MMI as the earlier of the date when, based on reasonable medical probability, further material recovery can no longer reasonably be anticipated, or the expiration of 104 weeks from the date income benefits began.

In a car crash or premises liability case there is no statutory MMI date. The concept is borrowed because it marks the moment when the full extent of the injury, and the cost of living with it, can be measured.

How it works in practice

In workers’ compensation, reaching MMI triggers an impairment rating, a percentage assigned by a doctor using the AMA Guides that drives impairment income benefits through the Texas Department of Insurance, Division of Workers’ Compensation. Disputes over the MMI date and rating go to a designated doctor and then to the Division’s dispute resolution process.

In a third-party injury claim, MMI is the point at which the treating physician can say what future care is likely, what it will cost, and what permanent limits remain. Before MMI, a demand letter is a guess. After MMI, the past medical bills are known, the future medical needs can be supported by a doctor’s opinion, and lost earning capacity can be assessed. Many claims are presented to the insurer shortly after MMI for exactly that reason, while keeping an eye on the two-year statute of limitations.

Why it matters in your case

Settling before MMI means settling blind. A knee that is still improving at month four may need surgery at month eight, and a release signed in between gives that claim away. Waiting for MMI is the standard reason an injury claim takes a year or more to resolve. The exception is a case where limitations is approaching or the policy limits are low enough that further treatment will not change the outcome.

Example

Jamal injures his lower back in a collision at Ben White and Lamar. After physical therapy and two injections, his pain plateaus. Eleven months after the crash his pain management doctor documents that he has reached MMI with a permanent lifting restriction and will likely need periodic injections. With that opinion in hand, the claim is presented to the insurer with a supported figure for future care.

This entry explains Texas law in general terms and is not legal advice for any specific situation. Statutes and case law change; the date above reflects the last review.