Butler: Apportionment Failed Where the Medical History Remained Unresolved

Review the primary filed WCAB panel decision.

In Butler v. State of California, Department of Toxic Substances Control, the WCAB denied reconsideration and adopted the workers’ compensation judge’s report. The report found that the defense had not carried its burden to prove nonindustrial apportionment with substantial medical evidence. A separate rating dispute asked whether the sleep specialist needed an alternative impairment analysis merely because he used an endocrine-system table. The adopted report accepted the physician’s explained straight rating on these facts. Application in another case turns on its diagnosis, method, and medical record.

The physicians relied on different histories

The medical record included opinions addressing cognitive, sleep, psychiatric, and other impairments. Some evaluators assigned a percentage to asserted nonindustrial alcohol use or life stressors, while another evaluator identified a history he had not previously known and called for confirmation.

The applicant did not testify at trial, and no supplemental reporting reconciled the materially different accounts. The judge therefore could not determine which historical premise was accurate.

Possibility did not satisfy the apportionment burden

The adopted report applied Cal. Lab. Code § 4663 and the substantial-evidence standard. An apportionment opinion must explain how and why nonindustrial factors caused a percentage of permanent disability and must rest on an accurate factual foundation.

Because the competing history remained unresolved, the report treated the proposed ten-percent allocations as speculative. Dr. Sones assigned ten percent of the psychiatric disability to identified nonindustrial stressors, including foreclosure, family deaths and separation. The judge applied the same substantial-evidence requirement to that allocation: Naming stressors did not supply the missing reliable factual and causal foundation on this record. Documented stressors require a reliable factual foundation and a reasoned causal explanation before they support psychiatric apportionment. It also explained that an opinion may be insufficient on apportionment while remaining usable on causation or impairment if those portions are independently supported. Butler, adopted report, pages 6–8.

Why the physician’s choice of chapter mattered

The defense challenged a 51-percent permanent-disability component associated with sleep impairment. The sleep specialist had assigned 45-percent whole-person impairment using Chapter 10, Table 10-1 of the American Medical Association’s impairment Guides. He attributed the obstructive sleep apnea to hypothalamic-pituitary endocrine dysfunction and explained why that body-system table applied. The 45-percent medical impairment and 51-percent disability component were different numbers at different stages of rating. Butler, adopted report, pages 8–10.

The report treated this as a straight Guides rating: The physician selected the chapter he found medically applicable, rather than using an alternative Almaraz/Guzman impairment analysis to rebut the standard rating method. The opposing argument did not identify a Guides provision requiring him to disregard that explained diagnosis or show why the proposed competing table was appropriate. The particular chapter’s name alone did not resolve the dispute.

For a reader reviewing a similar rating objection, separate four questions: What condition was diagnosed, why the physician selected the body-system chapter, how the selected table relates to the condition and daily-function effects, and whether an alternative method was actually used. A different chapter from the one the insurer expected does not by itself establish an unsupported alternative analysis. The physician must still explain the method.

Do not copy the 45-percent impairment into another case or treat it as the final disability award. The accepted explanation and underlying medical findings are the point. A complete rating also involves the applicable legal adjustments and case-specific record. Butler, adopted report, pages 8–10.

Build history before the record closes

Apportionment and rating methodology need separate explanations. The report could be deficient on the cause of a nonindustrial percentage while remaining usable on independently supported impairment findings. For the unresolved-history issue, read our companion analysis of Butler’s factual foundation; this page’s rating question concerns whether the physician explained the applicable Guides method.

This three-commissioner WCAB panel accepted the physician’s Chapter 10 straight rating because the specialist connected the diagnosed hypothalamic-pituitary endocrine dysfunction to obstructive sleep apnea and explained the selected table. A different record requires its own medical explanation and Guides analysis. The case left the joint 73-percent permanent-disability award unchanged; that award was distinct from the 45-percent impairment finding discussed above. Butler, pages 1, 5, 10.