Under California’s 2005 rating schedule, a permanent-disability rating is built from whole person impairment (WPI) under the AMA Guides, Fifth Edition, which the schedule adopts and incorporates (8 CCR §9805). Pain gets one extra lever. Page 1-12 of the Permanent Disability Rating Schedule (PDRS) allows up to 3% WPI for pain on top of a body-part impairment. Three points sounds small. In this guide’s lumbar example, the full 3% moves the final rating by four or five points and the award by $4,132.50 to $7,250.
What the schedule says
The rule sits in Section 1 of the schedule, under “Rating Impairment Based on Pain”: “Pursuant to Chapter 18 of the AMA Guides, a whole person impairment rating based on the body or organ rating system of the AMA Guides (Chapters 3 through 17) may be increased by 0% up to 3% WPI if the burden of the worker’s condition has been increased by pain-related impairment in excess of the pain component already incorporated in the WPI rating in Chapters 3-17.”
Three things follow from that sentence. The add-on increases a rating made under the Guides’ body and organ chapters, 3 through 17: it attaches to an impairment rather than standing alone. It is a range, “0% up to 3%,” not an automatic 3%. And it has a condition: pain-related impairment beyond the pain the chapter rating already accounts for. The schedule adds that a physician “may perform a formal pain-related impairment assessment if deemed necessary to justify the increase,” pointing to Section 18.3f of the Guides.
Three percent per injury, not per body part
The cap counts injuries, not body parts: “The maximum allowance for pain resulting from a single injury is 3% WPI regardless of the number of impairments resulting from that injury.” A back and a shoulder hurt in the same fall share one 3%. Dividing it is the physician’s job: “In the case of multiple impairments, the evaluating physician shall, when medically justifiable, attribute the pain in whole number increments to the appropriate impairments,” and each share is added to its own impairment. The impairments are then combined as usual, on the Combined Values Chart.
Where it enters the math: before the 1.4
“The addition of up to 3% for pain is to be made at the whole person level.” The schedule’s illustration is an elbow, whose rating “would first be converted to the whole person scale, and then increased. The resultant rating would then be adjusted for diminished future earning capacity, occupation and age.”
For injuries on or after January 1, 2013, Labor Code §4660.1(b) multiplies “the employee’s whole person impairment, as provided in the Guides” by an adjustment factor of 1.4. The pain add-on is part of that whole person impairment, so it goes through the multiplier and then through the occupation and age adjustments: every step laid out in how permanent disability is calculated.
What three points are worth
One lumbar spine impairment (15.03.01.00) at 8% WPI, at each step of the add-on. Final PD and total PD indemnity for three occupations, age 45, a 2026 injury, at the $290 maximum weekly rate, single impairment, before apportionment:
| WPI | Clerical · 111 | Custodian · 340 | Carpenter · 380 |
|---|---|---|---|
| 8% + 0 = 8% | 8% · $6,960 | 14% · $13,412.50 | 15% · $14,645 |
| 8% + 1 = 9% | 10% · $8,772.50 | 16% · $16,095 | 18% · $18,995 |
| 8% + 2 = 10% | 11% · $9,932.50 | 17% · $17,545 | 19% · $20,445 |
| 8% + 3 = 11% | 12% · $11,092.50 | 18% · $18,995 | 20% · $21,895 |
The full 3% adds $4,132.50 for the clerical worker, $5,582.50 for the custodian, and $7,250 for the carpenter. Written the way the schedule’s own examples write a rating, with the pain folded into the WPI, the carpenter’s string changes from the second slot on:
15.03.01.00 - 11 - [1.4]15 - 380H - 19 - 20
The schedule’s own example, and a cap that absorbs it
Section 7 of the schedule works a pain add-on through a full rating in its Example B. A 30-year-old stevedore injures his left leg: a below-knee amputation at 80% of the lower extremity (32% WPI), limited knee motion at 35% (14% WPI), and stump pain “substantially aggravated by performing ADL’s” rated as a 3% add-on. The schedule adds the 3% to the amputation (32% + 3% = 35% WPI) and prints 17.01.02.02 – 35 – [5]45 – 351G – 48 – 44. That [5] is the impairment’s earning-capacity rank; a rating for an injury on or after January 1, 2013 multiplies by 1.4 at that step instead (§4660.1(b)).
Combined with the knee, the leg comes to 53% PD (44 C 16). But the schedule also computes the maximum for a single leg, 40% before adjustments, 50% PD for this worker, and takes the lower of the two, so the leg rates 50%. Run the example without the add-on and the engine gets 50% as well (40 C 16 = 50). On a limb that already rates at its single-extremity maximum, a pain add-on adds nothing.
Pain isn’t on SB 863’s add-on list
For injuries on or after January 1, 2013, §4660.1(c)(1) provides that impairment ratings “for sleep dysfunction, sexual dysfunction, or psychiatric disorder, or any combination thereof, arising out of a compensable physical injury shall not increase,” and (c)(2) excepts psychiatric injury resulting from being the victim of a violent act or directly exposed to a significant one, or from a catastrophic injury. That is the rule behind the limits on psychiatric add-ons. Pain isn’t on the list, and §4660.1 doesn’t mention it. The schedule itself, pain rule included, remains “prima facie evidence of the percentage of permanent disability” under §4660.1(d).
The schedule’s impairment list carries pain as 18.00.00.00, “Variable Pain – use FEC rank for involved body part”: in a rating that uses the earning-capacity ranks, the add-on takes the rank of the body part it rides on. The same list also has “Chronic Pain” numbers under 13.11: causalgia, post-traumatic neuralgia, and reflex sympathetic dystrophy, in the upper and lower extremities. Those are impairments in their own right, not the Chapter 18 add-on.
Reading the add-on in a report, and rating it
Because the add-on comes from the medical evaluation, a rater reads the report for three things: how many points (0 to 3), which impairment each point attaches to, and that the injury’s total stays at 3 or under. The rest is arithmetic. In the calculator, each impairment has a Pain field that takes a whole number from 0 to 3. The engine adds it after converting to WPI and before the 1.4, and if a case’s pain adds up to more than 3, it holds back the combined rating and shows a warning instead. Descriptive summary of the 2005 PDRS pain rule (p. 1-12); not legal advice.