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How Permanent Disability Is Rated in California
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By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization · Cal Bar #285231
How is permanent disability rated in California workers' comp?
A doctor measures impairment, the rating schedule adjusts it, and the final percentage becomes the basis for permanent disability payments.
The permanent disability rating is one of the most important numbers in the claim. It can affect payment amount, settlement value, return-to-work planning, and future medical negotiations.
The rating process is not just a doctor picking a number. It is a chain. Medical impairment comes first. Then California rating rules adjust that impairment for occupation and age. Then valid apportionment may reduce the work-related share. Each step can contain errors.
This page explains the rating chain in plain language so you can read a QME, AME, or treating doctor report with better questions.
What role do the AMA Guides play?
The AMA Guides help the doctor measure medical impairment before California turns that impairment into a workers' comp disability rating.
The AMA Guides are a medical reference. They help a doctor measure impairment from objective findings, exam results, surgery history, range of motion, nerve findings, and diagnosis. The guide is not the final California dollar formula. It is the starting point.
For many injuries, the doctor states a whole person impairment value. That value then moves into the California Permanent Disability Rating Schedule. The rating schedule adjusts the impairment for the worker's job and age. Labor Code 4660.1 is part of the modern rating framework for many post-2013 injuries.
A rating can go wrong if the doctor uses the wrong chapter, misses a body part, overlooks job demands, or fails to explain the basis for impairment. A careful review checks the medical findings against the cited method.
How do occupation and age affect the rating?
California adjusts impairment because the same medical limit can affect a heavy job and a desk job in different ways.
Occupation matters because work demands matter. A shoulder injury may affect a warehouse selector, nurse, mechanic, or construction worker more than it affects a worker whose job is mostly seated. A back injury may limit bending, lifting, and standing in ways that are central to some jobs.
Age also affects the rating under the schedule. The rating system uses the worker's age at the date of injury. The adjustment is not a character judgment about the worker. It is part of the formula California uses to translate medical impairment into disability.
The job description should be accurate. A generic title can hide the real work. The report should reflect actual duties, tools, lifting demands, driving, patient transfers, overhead work, or repetitive tasks when those facts matter.
What is apportionment in a PD rating?
Apportionment is the doctor's opinion about what share of permanent disability was caused by work and what share was caused by other factors.
Labor Code 4663 requires permanent disability apportionment to be based on causation. In plain terms, the doctor must explain how much of the lasting disability comes from the work injury and how much comes from other causes. Labor Code 4664 limits the employer's liability to the work-caused share.
Apportionment is often disputed. A report may blame age, arthritis, prior symptoms, old claims, or imaging findings. The opinion should still explain the medical reasoning. The phrase degenerative changes is not magic. The report should connect the facts to the final percentage.
Escobedo is a WCAB en banc decision, not a Supreme Court case. It is often cited for the idea that apportionment can be valid only when the medical opinion explains the how and why. A weak apportionment opinion can be challenged by supplemental reporting, deposition, or trial.
How does the rating become money?
After the percentage is final, Labor Code 4658 converts the rating into scheduled weeks paid at the proper PD rate.
The rating does not float in the air. It feeds the payment schedule. Labor Code 4658 assigns benefit weeks based on the final permanent disability percentage. Higher ratings receive more weeks. The weekly amount depends on the correct PD rate for the claim.
| PD rating | Benefit weeks | Award at the 2026 max ($290/wk) |
|---|---|---|
| 10 percent | 30 weeks | $8,700 |
| 20 percent | 75 weeks | $21,750 |
| 30 percent | 130 weeks | $37,700 |
| 40 percent | 200 weeks | $58,000 |
| 50 percent | 270 weeks | $78,300 |
| 60 percent | 350 weeks | $101,500 |
| 70 percent | 430 weeks | $124,700 plus a life pension |
The table shows why small rating changes matter. A missed body part, wrong occupation group, or unsupported apportionment can shift the payment range. It can also affect the settlement conversation because future medical care and risk are negotiated on top of the rating.
How can a worker challenge a low rating?
A low rating can be challenged by correcting the medical record, asking for a supplemental report, taking a deposition, or presenting evidence to a judge.
The best challenge depends on where the problem appears. If the job duties are wrong, the worker may need a better job description. If a body part is missing, the medical record may need a supplemental report. If apportionment is unsupported, the doctor may need to explain the reasoning under questioning.
The QME panel process under Labor Code 4062.2 can also matter when a represented worker disputes medical issues. Specialty selection, the records sent to the evaluator, and the history given at the exam can affect the report.
A low rating should be reviewed before settlement. Once the case resolves, it can be much harder to fix a rating problem that should have been addressed earlier.
What documents make the rating more accurate?
Accurate ratings depend on medical records, job descriptions, symptom history, prior injury records, diagnostic tests, and clear work-restriction evidence.
Bring facts to the rating process. A doctor cannot rate a missed body part. A doctor may understate work limits if the job history is vague. A worker should describe actual tasks, not just a title.
Medical records should include surgery reports, imaging, therapy notes, specialist visits, medication history, and prior records. Prior records can help show what changed after the work injury. They can also answer apportionment arguments.
Job evidence matters too. Photos, duty statements, schedules, tool lists, and coworker statements can explain heavy or repetitive work. The rating is stronger when the report is built on real facts.
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Tap to call →How does Yazdchi Law review rating reports?
The review checks the impairment method, job facts, rating string, apportionment reasoning, future care, and settlement impact.
Yazdchi Law handles rating disputes for workers across Greater LA, including cases at the Van Nuys, Los Angeles, Long Beach, Pomona, San Bernardino, Riverside, and Oxnard WCAB districts. A review starts with the medical-legal report and rating string. It then compares the report to job facts, treatment records, and the worker's actual limits.
The review is practical. It asks whether the doctor knew the real job. It checks whether the report missed surgery, symptoms, or a body part. It looks for apportionment that sounds certain but lacks a clear reason. It also checks whether future care was described well enough for settlement.
When the report is weak, the next step may be a supplemental report, deposition, rating instruction, or trial issue. The goal is not to argue every sentence. The goal is to fix the parts that change benefits.
A rating review should happen before the number becomes the anchor for settlement. Once the parties negotiate around a weak number, later corrections become harder. Early review gives the worker better leverage.
The worker's own notes can help. Write down what the job required before the injury and what the body cannot do now. Simple facts can expose a report that sounds precise but rests on a thin history.
Eman Yazdchi is a Certified Specialist in workers' compensation law, certified by the California Board of Legal Specialization, State Bar of California. For help reviewing a QME, AME, or MMI rating report, call (661) 273-1780. The right challenge is usually strongest before the settlement papers are signed.
Frequently Asked Questions
Is whole person impairment the same as permanent disability?
Whole person impairment is not the same as permanent disability. Impairment is the medical starting point. California then adjusts that number through the rating schedule for job demands, age, and legally valid apportionment.
Who gives the impairment rating?
The impairment rating may come from a treating doctor, QME, or AME. The report should explain the medical findings and the method used. The final disability rating may then be calculated from that report.
Can my job duties raise the rating?
Job duties can affect the rating when the schedule adjusts impairment for occupation. The actual work matters. A job title alone may not show lifting, driving, standing, overhead work, patient care, tools, or repetitive tasks.
Can age lower or raise a rating?
Age is part of the California rating formula. The schedule uses age at the date of injury. The adjustment should be applied mechanically from the correct data, not guessed by the insurer or the worker.
What is unsupported apportionment?
Unsupported apportionment is a split of disability that lacks a clear medical explanation. A doctor should explain how and why non-work factors caused part of the permanent disability. Bare labels are often not enough.
Does every injury get a PD rating?
A PD rating becomes important when the work injury leaves lasting impairment after MMI. Some minor claims resolve with no ratable permanent disability. Other claims require detailed rating work after the condition stabilizes.
Can a QME report be corrected?
A QME report can sometimes be corrected through a supplemental report, factual clarification, deposition, or trial evidence. The right path depends on the error, the timing, and whether the issue is medical, factual, or legal.
Should I accept the insurer's rating?
Do not accept a rating until the report, job data, apportionment, and payment math have been checked. A rating that looks official can still be wrong, incomplete, or based on a weak medical assumption.
What if the doctor used the wrong job title?
A wrong job title can affect the occupation adjustment. The worker should provide a clear duty description, not just a payroll title. Heavy, repetitive, driving, or overhead tasks can matter when the rating schedule is applied.
Can prior injuries affect the rating?
Prior injuries can affect the rating through apportionment or credits, but the doctor must explain the medical link. A prior problem does not automatically erase disability caused by the new work injury.
Last reviewed by Eman Yazdchi, Esq., July 2026.
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