Quick Answer
Guide to Maximum Medical Improvement (MMI) or Permanent & Stationary (P&S) status in California workers' comp including when declared, what happens next, and impairment ratings.
Reaching Maximum Medical Improvement (MMI)—called Permanent and Stationary (P&S) in California—is a critical milestone in your workers' comp case. Understanding what P&S means and what happens next protects your rights.
What Is Permanent and Stationary (P&S)?
Definition: Your medical condition has stabilized and is unlikely to improve significantly with further medical treatment
Same as MMI: Other states call it "Maximum Medical Improvement"
Doesn't mean: You're fully healed or pain-free
Means: Condition is as good as it's going to get with current treatment
Who Determines P&S Status?
Your authorized treating physician (ATP): Primary doctor managing your care decides
Based on: Medical evaluation, response to treatment, clinical judgment
Timing: Varies by injury (weeks to years)
What Happens at P&S?
Temporary disability ends: No more TD benefits
Work restrictions assigned: Permanent limitations on physical activities
Permanent impairment rating: Doctor assigns disability percentage
Return to work expected: If medically able within restrictions
SJDB voucher: May qualify if don't return to injury employer
Permanent Impairment Rating
Doctor uses: AMA Guides to the Evaluation of Permanent Impairment
Rates: Percentage of whole-person impairment (1-100%)
Adjusted for: Age, occupation, diminished future earning capacity
Determines: Permanent disability benefit amount
Learn more: Permanent Disability Ratings
Can P&S Be Disputed?
Yes: If disagree with P&S determination
Request: Qualified Medical Evaluator (QME) for second opinion
Common disputes:
- P&S declared too early
- Condition still improving
- Additional treatment needed
Treatment After P&S
Medical care continues: For life as long as reasonable and necessary
No time limit: California doesn't cap medical treatment
May include: Ongoing medication, periodic check-ups, future surgery if needed
Related Topics
Legal Disclaimer
Consult a qualified California workers' compensation attorney for advice about your specific case and P&S determination.
Last updated: January 5, 2026
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