When a QME Apportions Disability to Personal History: Test Every Factual Link

A QME may attribute permanent disability partly to a personal or medical history. The percentage is not the first question. Start with the facts the physician used: Which history was reported, where is it documented, whether conflicting accounts were resolved, and how the fact medically caused permanent disability. An apportionment opinion can look precise while resting on an unstable premise.

List every factual premise in the apportionment paragraph

Extract the claimed prior condition, behavior, exposure, symptoms, treatment, and timing. For each premise, identify the supporting medical record or testimony and any contradiction. Send the evaluator the actual conflict. A request asking only whether the doctor stands by a percentage invites repetition rather than analysis.

In Butler v. State of California, Department of Toxic Substances Control, Nos. ADJ6958667 & ADJ6960238 (Cal. WCAB Sept. 11, 2026), the Board declined to rely on apportionment opinions tied to inconsistent and unresolved accounts of alcohol history. The panel affirmed the disability result on the record before it. It did not announce that personal history can never support apportionment.

Demand the medical bridge required by section 4663

Labor Code section 4663 requires a physician to address causation of permanent disability and approximate the percentages caused by industrial injury and other factors. The opinion should explain how a proved nonindustrial factor caused present permanent disability. Risk, susceptibility, or a biographical fact is not automatically causation.

Keep impairment method separate from apportionment

First determine the impairment under the applicable rating framework. Then address what caused the resulting permanent disability. A dispute over an alternative impairment method does not repair a deficient causation analysis. Likewise, rejecting apportionment does not necessarily require departing from the Guides.

Use a contradiction chart before deposition

Place the QME history, treating records, intake forms, testimony, and later supplemental reports side by side. Ask which account the physician accepts and why. The goal is not to attack the worker’s character; it is to determine whether the medical conclusion rests on substantial, accurately framed evidence.

For the underlying procedural history and limits, read Butler: Unresolved Alcohol History Could Not Carry Medical Apportionment.

Practical checklist before a QME deposition

For injured workers and California employers, the strongest examination follows the physician’s actual causal chain. It does not assume that a sensitive history is irrelevant, and it does not accept it as true merely because it appears in a report.

• Quote each factual premise and identify the record, interview, or testimony the evaluator relied on.
• Place conflicting histories in a dated comparison chart and provide the underlying pages.
• Ask which version the physician accepts and what medical evidence supports that choice.
• Separate causation of impairment from causation of permanent disability under section 4663.
• Ask the evaluator to explain how each nonindustrial factor presently causes disability and supports the percentage.

What to do next may include a supplemental report, deposition, or focused trial record. Avoid framing the inquiry as a moral judgment about personal history. The legal question is whether accurate facts and reasoned medical analysis amount to substantial evidence.

Use the same factual record across specialties

Where several evaluators address related conditions, check whether each received the same history, diagnostic records, and prior reports. An orthopedist, internist, and psychiatric evaluator may use the same event differently. Identify cross-specialty assumptions expressly so one report does not silently treat another physician’s disputed premise as proved.

The final trial presentation should connect admitted records to the evaluator’s reasoning and distinguish correction of history from disagreement with medical judgment. If a witness changes an account, preserve the explanation and timing. The judge can then assess whether the opinion remains substantial evidence rather than choosing between isolated quotations.

Additional record safeguards

Apportionment analysis should also identify the date at which permanent disability is being evaluated. A prior condition may exist without contributing to current disability, while a later event may change the medical picture. Ask the evaluator to address temporal sequence and avoid double counting the same factor across diagnoses. When the record includes substance-use information, apply privacy protections and limit dissemination to what is genuinely relevant to the disputed medical opinion.

That focused sequence also makes the resulting trial record easier to review.

Frequently Asked Questions

Can personal history ever support apportionment?

Yes, if substantial medical evidence explains how a proved nonindustrial factor caused permanent disability.

Is a percentage enough?

No. The evaluator must disclose the reasoning and factual basis for the allocation.

What was the central problem in Butler?

The medical apportionment relied on inconsistent and unresolved factual histories.