Permanent Disability Ratings in California

If your workplace injury results in lasting physical or functional limitations, you may be able to get Permanent Disability (PD) benefits through a workers' compensation case filed in California. Understanding how your PD rating is calculated, what it is worth in actual dollars, and how a concept called apportionment can affect that value will help you approach the process with a clearer picture of what is at stake.

How PD Ratings Are Calculated

The process of calculating a PD rating begins when your treating physician or QME determines you have reached Maximum Medical Improvement (MMI), which is the point at which your condition has stabilized and is unlikely to change significantly, no matter what treatments you use or how much rest you get. At that point, a Whole Person Impairment (WPI) percentage is assigned using the AMA Guides to the Evaluation of Permanent Impairment.

That WPI figure is not your final PD rating, though. It is more like the starting point.

California's Permanent Disability Rating Schedule then applies two additional adjusters to produce the final PD percentage:

• Occupational modifier — Reflects the degree to which the disability affects the specific physical demands of your occupation; a back impairment carries more weight for a construction worker than for a data analyst, for example.
• Age modifier — Recognizes that older workers have fewer years ahead to absorb the financial impact of a lasting impairment; older workers generally receive a slightly higher adjusted rating as a result.

The resulting final PD percentage falls somewhere between 1% and 100%, with 100% representing total permanent disability.

What Your PD Percentage Means in Dollars

Your PD percentage does two things: it determines how many weeks of payments you receive, and it sets the rate at which you are paid each week. The weekly PD rate is usually two-thirds of your pre-injury average weekly wage, subject to a statutory cap. For injuries in 2026 [the year of this writing], the maximum PD weekly rate for ratings under 70% is $290 per week.

The number of benefit weeks is calculated using a tiered schedule under Labor Code Section 4658, which becomes more generous as the rating rises. Consider a hypothetical worker who receives a 20% PD rating and qualifies for the maximum 2026 weekly rate of $290. A 20% PD rating corresponds to approximately 70 weeks of payments under the current schedule, producing a total PD benefit of roughly $20,300.

Now consider the same worker with a 30% rating instead. A 30% PD rating corresponds to approximately 120 weeks, which would be more than double the benefit weeks, producing a total PD benefit of around $34,800 at the same weekly rate. This non-linear structure is why even a modest difference in PD rating can translate into a significant difference in case value.

(Keep in mind that these figures are illustrative only. Your actual benefit depends on your date of injury, wages, and final rating.)

How Apportionment Works

Apportionment is one of the most important and most frequently misunderstood concepts in permanent disability. Under California Labor Code Section 4663, physicians writing medical-legal reports are required to address apportionment: that is, to identify what portion of the disability is attributable to the work injury versus pre-existing conditions or non-industrial factors.

Only the work-related portion of your disability is compensable through workers' compensation. If a QME determines that 30% of your permanent disability is attributable to a pre-existing degenerative condition, only the remaining 70% is payable by the workers' comp insurer.

Using our earlier hypothetical: if that same 20% PD rating is apportioned 30% to a pre-existing condition, the compensable rating drops to 14%, reducing approximately 70 weeks of payments to roughly 46 weeks, and lowering the total PD benefit from approximately $20,300 to around $13,340. That is a difference of roughly $7,000 from a single apportionment determination.

It is worth knowing that apportionment findings are not always correct. Physicians sometimes over-apportion to pre-existing conditions, and those findings can be challenged. If you believe your apportionment is inaccurate or unfair, the formal mechanism for disputing it is through the Workers' Compensation Appeals Board, where a WCAB judge will weigh all available medical evidence, including supplemental reports and competing physician opinions, before issuing a determination on the compensable percentage.

PD ratings and apportionment have a direct and measurable impact on the value of your case. If you have questions about your rating or believe it should be challenged, call Pacific Workers', The Lawyers for Injured Workers at (888) 740-6434. We offer free consultations to injured workers across California.