What Is MMI (Maximum Medical Improvement)?

July 22, 2026 · Employment Litigation

General education about California workers’ compensation concepts and related employment-law issues—not legal advice. Your facts, injury date, and medical reports control. This is not a Workplace Rights Advocacy case result.

The short answer

MMI stands for maximum medical improvement. In California workers’ compensation, doctors often use the related phrase permanent and stationary (P&S). Both ideas point to the same practical moment: your industrial injury has stabilized—further significant improvement is not reasonably expected from additional healing time or the treatment you have already been receiving.

In plain English: MMI is not a declaration that you are “all better.” It means the temporary healing phase has plateaued. You may still have pain, work restrictions, or lasting impairment. Those residuals are evaluated next—often as permanent disability—instead of being treated as an ongoing temporary disability.

Who decides you are at MMI?

Your treating physician (or a qualified medical evaluator / agreed medical evaluator in a disputed case) makes the medical determination. Insurers and claims adjusters do not get to invent MMI on their own. They can ask for an MMI / P&S report, schedule an evaluation, or dispute the doctor’s opinion—but the status itself is a medical finding.

You should receive a written report describing your condition, work restrictions (if any), need for future medical care, and whether you have permanent impairment. Keep copies. That report often drives what happens to your temporary disability checks and what benefits may come next.

What MMI does not mean

Reaching MMI does not automatically mean:

You must return to your old job with no changes
All medical treatment ends forever
You have no permanent disability
Your employer can ignore disability or leave laws under FEHA, CFRA, or FMLA

Those are separate questions. Workers’ compensation benefits and employment-law rights often overlap when you try to return to work after a work injury. If your employer refuses reasonable accommodations, forces you out, or retaliates after you report an injury or request leave, you may have civil employment claims in addition to a workers’ compensation case.

What usually happens after MMI

After MMI / P&S, the claim typically shifts from the temporary disability phase to evaluating permanent disability, future medical needs, and return-to-work options. Temporary disability indemnity often stops around this point—because temporary disability is designed for the healing period, not the permanent phase. Read more in our posts on why MMI stops TD and why TD payments stop.

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