MMI is your maximum medical improvement as determined by your treating physician. At the conclusion of your treatment, we often request a final narrative that includes your MMI. This means that the patient has reached a point where they are as healthy as they can be. They may not be in the condition that they were prior to the accident, but their health has stabilized. If that is the case, a doctor may assign the patient a permanent impairment rating according to American Medical Association guidelines. Automobile insurance companies may want access to the permanent impairment rating as part of their case evaluation.