Workers’ Compensation · Primary-source case analysis

DiFusco: WCAB Defendants Must Identify Every Entity Potentially Liable for Payment

By Aneeta Mishra and Timothy Chan

Published April 13, 2026

An award is only useful if the responsible payor is correctly identified. DiFusco addresses disclosure of insurers, administrators, deductibles, retentions, excess coverage, and other arrangements that may affect who must pay compensation.

Why the insurance information mattered

The applicant had a long-running claim involving permanent total disability and home-health-care orders. When payment problems arose, counsel requested information identifying the carrier, possible excess coverage, policy limits, and every entity potentially responsible. The defendant maintained that naming the carrier satisfied WCAB Rule 10390 and that the older Coldiron decisions required no more.

The Board’s treatment of precedent

Sitting en banc, the WCAB explained that its en banc decisions bind panels and workers’ compensation judges unless the Board rescinds them, a higher court overrules them, or legislation renders them inapplicable. A later regulation does not silently erase an en banc holding. Rule 10390 therefore had to be read together with Coldiron rather than as an implied repeal.

The disclosure rule

The Board held that defendants must identify entities liable for payment and insurance provisions that affect responsibility, including arrangements such as a high self-insured retention, large deductible, or excess coverage. The duty is not limited to cases involving a third-party administrator. The burden of determining who is responsible cannot be shifted to the injured worker when the information is controlled by the defense.

The disposition

The WCAB rescinded the workers’ compensation judge’s narrower findings and returned the matter for further proceedings. The opinion establishes a disclosure rule; it does not decide that every listed entity is ultimately liable or set the amount of any unpaid benefit.

Key takeaways

• Rule 10390 and Coldiron operate together.
• Every entity and policy provision affecting payment responsibility must be disclosed.
• A third-party administrator is not a substitute for identifying the actual parties.
• Final liability still depends on the policy and adjudicated record.