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California Labor Code §4660 — Permanent Disability Rating
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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
(a) In determining the percentages of permanent disability, account shall be taken of the nature of the physical injury or disfigurement, the occupation of the injured employee, and his or her age at the time of the injury, consideration being given to an employee's diminished future earning capacity.
What does California Labor Code §4660 establish?
Section 4660 establishes California's permanent disability rating system, the structured conversion of medical impairment into a final disability percentage that drives the cash award.
Section 4660 is California's rule establishing the permanent disability rating system, the structured framework that converts a medical impairment percentage into a final disability rating that drives the cash award. The AMA Guides, occupational adjustments, and age modifiers all feed the calculation. Certified Specialist Eman Yazdchi (California Board of Legal Specialization, State Bar of California) audits the section 4660 rating mechanics on every PD file in the practice.
California Labor Code §4660 establishes the California permanent disability (PD) rating method. The §4660 California rule starts with whole-person impairment under the AMA Guides to the Evaluation of Permanent Impairment, Fifth Edition, as adopted by the legislature, and then adjusts the impairment number for the worker's age at the date of injury, occupational group, and diminished future earning capacity (DFEC) factor. The §4660 California output is a final PD percentage from 0% to 100% that drops directly into the California Labor Code §4658, California's permanent disability payment schedule and weekly indemnity rate, schedule (dollar award) and triggers the California Labor Code §4659, California's life pension for ratings of 70% or higher, life pension when the post-apportionment rating reaches 70%. The §4660 California rating coordinates with §4663, California's apportionment rule that splits the resulting disability between work and non-work causes, and §4664, California's accumulation rule that prevents double-recovery across separate impairments, at the apportionment stage, and with §4660.1, the post-SB 863 rating framework for sleep, sexual, and psychiatric add-on impairment, for post-2013 dates of injury.
How is the §4660 California AMA Guides impairment determined?
The rating starts from the AMA Guides 5th Edition impairment percentage, adjusted through the rating schedule for occupation, age, and diminished future earning capacity factors.
Under California Labor Code §4660, the California AMA Guides Fifth Edition impairment is determined by the treating physician (or a California Labor Code §4062.1-unrep or California Labor Code §4062.2-represented Panel QME, or an Agreed Medical Evaluator) using the impairment tables, range-of-motion measurements, and diagnosis-based estimates the Fifth Edition prescribes. The §4660 California impairment number, expressed as a whole-person impairment percentage, captures the anatomical and functional loss attributable to the industrial injury, not the worker's wage loss or vocational impact (those come later in the §4660 rating string).
What does §4660 California age and occupation adjustment add?
Multiple body parts are rated separately and combined using a formula that prevents the total from exceeding 100% regardless of how many injured regions are involved in the case.
Under California Labor Code §4660, the California rating string adjusts the AMA whole-person impairment for the worker's age at the date of injury and the worker's occupational group at the time of injury. Older California workers and physically demanding occupations generally produce upward adjustments, the §4660 California rule recognizes that the same medical impairment hits a 55-year-old construction worker harder than a 28-year-old desk worker. The §4660 California occupational adjustment uses the Schedule for Rating Permanent Disabilities adopted by the Administrative Director.
What is the §4660 California diminished future earning capacity (DFEC) factor?
Apportionment under the related rule reduces the rating proportionately for any pre-existing non-industrial disability that contributed to the overall impairment being evaluated.
Under California Labor Code §4660, the California DFEC factor adjusts the impairment-plus-age-plus-occupation rating for the diminished future earning capacity caused by the impairment. The §4660 California DFEC framework attaches a multiplier to the AMA-Guides impairment based on the impairment's expected wage impact. The result is a "permanent disability" percentage that is meant to capture both the medical loss and its earning-capacity consequences, not pure medical impairment alone.
How does §4660 California interact with §4663 apportionment and §4658 payment?
The WPI from the AMA Guides is the starting point, not the endpoint, the schedule conversions, occupational modifier, and age modifier all change the final percentage substantially.
Under California Labor Code §4660 (rating method) and California Labor Code §4663 (apportionment), the California rating output is then reduced for any non-industrial contribution under §4663 California apportionment. A pre-apportionment §4660 California 80% rating with 25% non-industrial apportionment becomes a final 60% rating. That final post-apportionment §4660 California percentage is what feeds into the California Labor Code §4658 California PD payment schedule (dollar award) and the California Labor Code §4659 California life-pension threshold (70-99% band). The §4660 California rating is the gatekeeper of every California PD dollar.
Related on yazdchilaw.com: California workers' comp settlement pillar · California Labor Code §4061.1 explained · California Labor Code §4663 (apportionment) · What happens at a mandatory settlement conference in california workers comp.
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What does California Labor Code §4660 actually establish for PD rating?
California Labor Code §4660 establishes the California permanent disability rating method. The §4660 California rule starts with whole-person impairment under the AMA Guides to the Evaluation of Permanent Impairment, Fifth Edition, and then adjusts the impairment number for the worker's age at the date of injury, occupational group, and diminished future earning capacity factor. The §4660 California output is a final PD percentage from 0% to 100% that drops directly into the California Labor Code §4658 payment schedule (dollar award) and triggers the California Labor Code §4659 life pension when the post-apportionment rating reaches 70%.
How is the §4660 California AMA Guides impairment actually determined?
Under California Labor Code §4660, the California AMA Guides Fifth Edition impairment is determined by the treating physician (or a California Labor Code §4062.1-unrep or California Labor Code §4062.2-represented Panel QME, or an Agreed Medical Evaluator) using the impairment tables, range-of-motion measurements, and diagnosis-based estimates the Fifth Edition prescribes. The §4660 California impairment number, expressed as a whole-person impairment percentage, captures the anatomical and functional loss attributable to the industrial injury, not the California worker's wage loss or vocational impact (those come later in the §4660 California rating string adjustments).
What does the §4660 California age and occupation adjustment add?
Under California Labor Code §4660, the California rating string adjusts the AMA whole-person impairment for the worker's age at the date of injury and the worker's occupational group at the time of injury. Older California workers and physically demanding occupations generally produce upward adjustments, the §4660 California rule recognizes that the same medical impairment hits a 55-year-old California construction worker harder than a 28-year-old desk worker. The §4660 California occupational adjustment uses the Schedule for Rating Permanent Disabilities adopted by the Administrative Director of the DWC.
What is the §4660 California diminished future earning capacity (DFEC) factor?
Under California Labor Code §4660, the California DFEC factor adjusts the impairment-plus-age-plus-occupation rating for the diminished future earning capacity caused by the impairment. The §4660 California DFEC framework attaches a multiplier to the AMA-Guides impairment based on the impairment's expected wage impact. The result is a "permanent disability" percentage that is meant to capture both the medical loss and its earning-capacity consequences, not pure medical impairment alone, making the California §4660 rating a hybrid medical-vocational construct.
How does §4660 California interact with §4663 apportionment and §4658 payment?
Under California Labor Code §4660 (rating method) and California Labor Code §4663 (apportionment), the California rating output is reduced for any non-industrial contribution under §4663 California apportionment. A pre-apportionment §4660 California 80% rating with 25% non-industrial apportionment becomes a final 60% rating. That final post-apportionment §4660 California percentage feeds into the California Labor Code §4658 California PD payment schedule (dollar award) and the California Labor Code §4659 California life-pension threshold (70-99% band). The §4660 California rating is the gatekeeper of every California PD dollar paid.
Last reviewed by Eman Yazdchi, Esq., June 2026.
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