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✦ Certified Specialist in Workers’ Compensation Law — Certified by the State Bar of California, Board of Legal Specialization ✦
Serving injured workers across California. Board-certified specialist; no fee unless we win.
By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization
In California, a §4663 apportionment fight against an insurer's QME assigning a large share to degenerative imaging requires substantial medical evidence framing under Brodie v. WCAB. Yazdchi Law, a Certified Specialist in Workers' Compensation Law firm, has recovered amounts up to $415,000 for similar cases where the apportionment defense was the value driver.
An injured California worker had been treating for an industrial back injury for nearly two years. The worker had reached Maximum Medical Improvement, and the QME under California Labor Code §4062.2 had issued a report assigning a significant Whole Person Impairment rating — but with an apportionment finding of 50% to non-industrial degenerative changes shown on the pre-injury MRI. A 50% non-industrial apportionment under California Labor Code §4663 would have cut the worker's permanent disability indemnity in half. The worker arrived at the firm with the QME report in hand, the insurer prepared to settle based on the 50% apportioned rating, and a hard strategic question: take the cut, or fight the apportionment under California Labor Code §4663 and the controlling case law.
This is one of the most common high-stakes procedural postures in California workers' compensation — a worker stuck with a QME report containing an aggressive apportionment finding that, if unchallenged, would cost real money. The legal framework for the fight is California Labor Code §4663 as interpreted by the Brodie v. WCAB line of authority on what constitutes substantial medical evidence for apportionment.
Several California Labor Code sections and controlling case-law principles layered together on a California Labor Code §4663 apportionment fight.
California Labor Code §4663 requires every permanent disability rating to account for non-industrial causation where supported by substantial medical evidence. The statute reads that apportionment of permanent disability shall be based on causation, and a physician's report addressing apportionment shall include an analysis explaining what approximate percentage of the permanent disability was caused by the direct result of injury arising out of and occurring in the course of employment and what approximate percentage of the permanent disability was caused by other factors both before and subsequent to the industrial injury.
The California Supreme Court's decision in Brodie v. WCAB (2007) and related cases set the standard for what counts as substantial medical evidence on apportionment. A bare statement that "50% is due to degenerative changes" does not meet the standard. The physician must explain how and why those non-industrial factors contributed to the disability, the specific medical reasoning, and the basis for the percentage assigned. Conclusory apportionment findings without medical reasoning are routinely struck down at the WCAB and the appellate level.
Pre-injury MRI evidence of degenerative changes does not, by itself, support apportionment under California Labor Code §4663. The medical-legal question is whether those pre-existing findings were causing disability before the industrial injury — not whether they merely existed on imaging. Many adults have degenerative spinal findings on MRI that are asymptomatic; if those findings were not causing disability before the work injury, they generally do not support apportionment after the work injury. The QME's apportionment must be grounded in actual pre-injury impairment, not in pre-injury imaging alone.
California Labor Code §4062.2 controls the QME selection and exam process. When the QME report contains apportionment findings that lack the substantial-medical-evidence analysis required under Brodie, the worker's attorney can submit a supplemental request to the QME for clarification — asking the QME to explain the medical reasoning, the specific pre-injury impairment relied upon, and the basis for the percentage assigned. A well-drafted supplemental request often produces either a revised report with reduced apportionment or a deficient response that supports striking the apportionment at trial.
When the supplemental request route does not resolve the apportionment, the case proceeds to trial at the WCAB. The worker's attorney challenges the QME's apportionment as not based on substantial medical evidence, cross-examines the QME if a deposition is taken, and submits briefing on Brodie and the related case law. The workers' compensation judge can adopt, modify, or reject the QME's apportionment finding based on the substantial-medical-evidence analysis. A successful apportionment challenge can restore the full California Labor Code §4660 permanent disability rating.
If the workers' compensation judge issues a Findings and Award adopting the contested apportionment, the worker can file a Petition for Reconsideration under California Labor Code §5903 within 25 days of service by mail (or 20 days from electronic service). The Petition for Reconsideration is heard by the WCAB en banc panel and is the route to challenge apportionment findings that lack substantial medical evidence. Adverse Reconsideration outcomes can be reviewed by the California Court of Appeal under a Petition for Writ of Review under California Labor Code §5950.
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Tap to call →Yazdchi Law has recovered amounts up to $415,000 for cumulative-trauma and specific-injury cases where a successful California Labor Code §4663 apportionment defense was the value driver — restoring the full California Labor Code §4660 permanent disability rating after the insurer's QME assigned a significant non-industrial share. The combined recovery layers the restored California Labor Code §4660 permanent disability indemnity, California Labor Code §4600 lifetime future medical care, the California Labor Code §4658.7 SJDB voucher up to $6,000, and the time-value of restored indemnity that would otherwise have been cut.
Every case stands on its own facts. Past results do not guarantee future outcomes. The recovery range described above reflects the firm's historical resolutions for similar injury types — it is not a prediction or guarantee for any future matter. Each California workers' compensation case turns on the specific medical evidence, employment record, statutory framework, and procedural posture in that case.
The Brodie v. WCAB line of California Supreme Court authority requires that a physician's apportionment finding be supported by an analysis explaining how and why non-industrial factors contributed to the disability, the specific medical reasoning, and the basis for the percentage assigned. A bare statement that "50% is due to degenerative changes" does not meet the standard. Conclusory apportionment findings without medical reasoning are routinely struck down at the WCAB and the appellate level.
Pre-injury MRI evidence of degenerative changes does not, by itself, support apportionment under California Labor Code §4663. The medical-legal question is whether those pre-existing findings were causing disability before the industrial injury — not whether they merely existed on imaging. Many adults have asymptomatic degenerative spinal findings; if those findings were not causing disability before the work injury, they generally do not support apportionment after the work injury under the substantial-medical-evidence standard.
California workers' compensation attorneys work on contingency under California Labor Code §4906 — typically 15% of any recovery, paid only if the case recovers. A free consultation costs nothing, and a Certified Specialist in Workers' Compensation Law, certified by the California Board of Legal Specialization, State Bar of California, can evaluate a QME apportionment finding, draft a California Labor Code §4062.2 supplemental request, and prepare the case for WCAB trial on the substantial-medical-evidence challenge. Yazdchi Law handles California California Labor Code §4663 apportionment fights from the firm's office in Palmdale.
Last reviewed by Eman Yazdchi, Esq., June 2026.
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