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MMI Medical Terminology
Updated March 2026

Maximum Medical Improvement (MMI)

Definition

The point at which a patient's medical condition has plateaued and further recovery or deterioration is not anticipated with or without additional treatment. MMI is functionally equivalent to the California-specific term permanent and stationary and marks the time when permanent impairment can be rated.

Related Terms

Frequently Asked Questions

What is a Maximum Medical Improvement (MMI)?

The point at which a patient's medical condition has plateaued and further recovery or deterioration is not anticipated with or without additional treatment. MMI is functionally equivalent to the California-specific term permanent and stationary and marks the time when permanent impairment can be rated.

Why is maximum medical improvement important in workers' compensation?

Maximum Medical Improvement is a key medical concept in workers' compensation evaluations. Understanding this term helps physicians document findings accurately and helps attorneys and adjusters evaluate the medical aspects of a claim.