Workers’ Compensation · Primary-source case analysis

Nunes: Vocational Evidence Cannot Replace Medical Apportionment at the WCAB

By Aneeta Mishra and Timothy Chan

Published April 13, 2026

Permanent-disability disputes can involve medical impairment, statutory apportionment, and vocational evidence about the worker’s ability to compete in the labor market. Nunes draws a firm line between those roles.

The dispute before the Appeals Board

The applicant challenged an award after medical and vocational evidence addressed permanent disability and apportionment. The WCAB had already rescinded the workers’ compensation judge’s findings and returned the matter for development of the record. On reconsideration, the applicant argued that the medical apportionment analysis was speculative and that vocational experts could reach a different apportionment conclusion.

The en banc rule

The Board held that Labor Code section 4663 assigns apportionment to reporting physicians and prescribes the governing standard. Vocational evidence remains relevant to permanent disability, including whether an industrial injury prevents feasible rehabilitation or meaningful labor-market participation. But a vocational expert may not substitute a competing theory of “vocational apportionment” for otherwise valid medical apportionment.

Why the distinction matters

A vocational report is not automatically substantial evidence merely because it uses labor-market terminology. It must identify the medical record it accepts, explain the vocational consequences of the industrial limitations, and address valid medical apportionment rather than silently disregarding it. Conversely, a medical apportionment opinion must itself be legally valid and supported by reasoning; Nunes did not make a defective medical opinion immune from challenge.

The disposition

The WCAB denied reconsideration of its en banc decision. The matter remained returned to the trial level for further development and proceedings. The decision therefore supplies a governing framework, not a factual declaration that every vocational opinion fails or that the applicant could not ultimately establish permanent total disability.

Key takeaways

• Medical evaluators supply the statutory apportionment opinion.
• Vocational experts may analyze disability and rehabilitation but cannot create a substitute apportionment method.
• Both medical and vocational opinions must explain their reasoning and engage the complete record.
• The ultimate disability finding remains record-specific.