What is Maximum Medical Improvement (MMI)?

Maximum Medical Improvement (MMI) is the medical point at which your treating physician determines that further treatment will not meaningfully improve your underlying condition — your medical status has plateaued. MMI does not mean you’re recovered; it means whatever residual impairment you have is what you’re going to have, and the case can now be valued for permanency. Reaching MMI triggers one of two paths depending on body part: a Schedule Loss of Use (SLU) award for scheduled body parts (extremities, vision, hearing, certain other listed conditions) or classification for non-schedule injuries (spine, brain, internal, systemic). Treatment can and usually does continue post-MMI for maintenance and symptom management — MMI is a permanency designation, not a treatment cutoff.

MMI doesn’t mean fixed. It means stabilized — so the case can be valued.

TL;DR

• MMI = medical plateau, not recovery. Your condition has stabilized; further treatment won’t meaningfully improve it.
• MMI triggers either SLU rating (scheduled body parts) or classification (non-schedule).
• Treatment continues post-MMI — for maintenance, symptom management, and reasonably necessary care.
• The MMI date is clinically determined by your treating physician, often contested by the carrier’s IME.
• Premature MMI from a carrier’s IME is one of the most common adversarial moves. Run any MMI finding through the IME Red Flag Checker.

What MMI means clinically

MMI is a clinical determination. Your treating physician — based on examination, imaging, and treatment response — concludes that the underlying condition has stabilized. Further surgery, injections, therapy, or medication will not meaningfully change the underlying impairment.

Two important distinctions:

MMI is not recovery. You can be at MMI with significant residual disability — chronic pain, range-of-motion loss, weakness, neurological symptoms. The point is that your impairment level isn’t expected to improve materially.

MMI does not end treatment. Maintenance care — periodic injections, physical therapy refreshers, pain management, medications, surgical revisions if symptoms worsen — continues to be compensable under WCL §13.

What MMI triggers

Reaching MMI is the trigger for permanency evaluation. Depending on the body part, one of two pathways applies:

Schedule Loss of Use (SLU) — for scheduled body parts. Arms, hands, fingers, legs, feet, toes, vision, hearing, facial disfigurement, certain other listed conditions. The treating physician assigns an SLU percentage based on NY’s 2018 Impairment Guidelines (range-of-motion deficits, surgical history, neurological findings). The percentage converts to a number of weeks of indemnity, paid as a lump sum. See Schedule Loss of Use and the SLU Estimator.

Classification — for non-schedule body parts. Spine, brain, internal injuries, systemic conditions, psychiatric. The case is classified at MMI based on Loss of Wage-Earning Capacity (LWEC). LWEC percentage drives both the rate and the duration of benefits going forward under the 2007 cap structure. See Non-schedule classification.

The MMI fight

The MMI date is frequently contested. The carrier’s IME may declare MMI months — or years — before your treating physician would. Why it matters: an early MMI date freezes your SLU rating or classification at a lower disability level than later medical might support.

Premature MMI tactics worth watching for:

• IME declares MMI before all reasonable treatment has been completed (pending surgery, in-progress physical therapy, scheduled injections)
• IME declares MMI based on a single examination, without records review
• IME declares MMI immediately after surgery, before the surgeon’s own follow-up
• IME assigns SLU using outdated guidelines or methodology

Run any IME report flagging MMI through the IME Red Flag Checker.

What I see go wrong

• Treating physician declares MMI too early. Sometimes inadvertent, sometimes pressured by office workflow. The SLU rating that results can substantially undervalue the claim.
• Carrier locks in an early MMI through an aggressive IME, then resists later adjustment when the condition worsens.
• Claimant misunderstands MMI to mean treatment ends and stops attending follow-ups. Don’t.
• MMI used to suspend benefits. MMI itself doesn’t suspend indemnity — it changes the basis for ongoing benefits to permanency. Suspension requires its own basis.

Post-MMI worsening

If your condition meaningfully worsens after MMI, the case can be reopened. The 7-year and 18-year reopening windows (WCL §123) apply depending on the type of award. See Can I reopen my closed workers’ comp case?.

What to do next

If you’ve been told you’re at MMI — whether by your treating physician or an IME — make sure the permanency rating that follows is correctly built. SLU and classification math is unforgiving. Contact me directly.

Related pages

• Where Am I? — Approaching MMI / classification
• Where Am I? — A classification or SLU decision was just issued
• What is a Schedule Loss of Use award?
• Non-schedule classification
• What is an IME and can I refuse one?
• Can I reopen my closed case?
• SLU Estimator