Phan: A 40% Work-Causation Finding Failed the Psychiatric-Injury Threshold

A doctor’s finding that work contributed to a psychiatric condition does not necessarily establish a compensable psychiatric injury. In Phan v. State of California, Employment Development Department, No. ADJ19474979 (WCAB Oct. 16, 2026, service date corrected Oct. 22, 2026), the Appeals Board upheld a denial after the agreed medical evaluator attributed 40 percent of the worker’s condition to employment. That finding fell below the predominant-causation threshold applicable to her claim. The Board therefore ended the analysis before reaching the employer’s good-faith personnel-action defense.

The public PDF contains two orders with different purposes. The October 16 decision denied reconsideration on the merits. The October 22 order corrected an omitted service date, identifying October 16 as the date of service, without granting reconsideration. Reading those documents together avoids mistaking the clerical correction for a second merits decision.

The dispute concerned the medical explanation for a 60–40 allocation

Phan claimed a psychiatric injury from her work as a customer service representative during the period June 18, 2009 through March 1, 2024. The agreed medical evaluator, psychologist Luigi Piciucco, reevaluated her on July 9, 2025. His reporting identified psychiatric conditions and attributed 60 percent of the current clinical conditions to a pre-existing, nonindustrial personality disorder and 40 percent to the consequences of alleged employment events.

The evaluator’s discussion addressed eleven stress claims. He deferred to the judge to determine whether the worker’s account described actual events of employment. He also addressed a possible personnel-action contribution while leaving the legal questions—whether the actions were lawful, nondiscriminatory and taken in good faith—to the judge. Those allocations and reservations answered different questions; the presence of a personnel-action percentage did not replace the initial injury-causation inquiry.

An August 28, 2025 supplemental report confirmed the nonindustrial diagnosis and 60-percent attribution. After trial, the judge’s July 15, 2026 findings concluded that Phan had not proved a compensable industrial psychiatric injury. She sought reconsideration, challenging both the medical reporting and the treatment of the employer’s personnel actions.

The Board tested the report’s foundation, not just its percentage

Phan argued that the evaluator had focused primarily on a particular suspension. The judge’s report pointed instead to his extensive history of alleged problems with coworkers and supervisors, harassment and feared retaliation. It found that he had considered the various events rather than relying on that one incident.

She also challenged the absence of later records, including a fitness-for-duty examination. The judge related that objection to the claimed cumulative-injury period ending March 1, 2024. Events occurring afterward were outside that alleged period. The report also noted that the evaluator had received her account of the later events, including her retirement after being found unfit for duty. The judge evaluated that objection against the claimed period and the information the AME had received.

Dr. Ferguson’s reporting, Applicant’s Exhibit 9, supplied another important contrast: The judge found that physician had not reviewed medical records. Evidence of some work stressors did not supply substantial medical evidence of predominant industrial causation. The Board agreed that the AME’s history, testing, records and explained reasoning supported his opinion.

Applying Escobedo v. Marshalls, 70 Cal. Comp. Cases 604, 621 (WCAB 2005) (en banc), the Board required reasonable medical probability, pertinent facts, adequate examination and history, and reasoning supporting the conclusion. It also relied on Power v. Workers’ Compensation Appeals Board, 179 Cal. App. 3d 775, 782 (1986), concerning the expertise and neutrality for which parties select an AME. It found no good cause to reject this AME’s opinion as unpersuasive. An agreed evaluator’s label was thus part of the analysis alongside the report’s actual evidentiary foundation.

The worker’s causation burden came before the employer’s defense

For the ordinary psychiatric-injury claim at issue, Labor Code section 3208.3(b)(1) required proof that actual employment events were predominant as to all causes combined. The opinion explained predominant causation as a work-related share greater than 50 percent. The AME’s 40-percent work attribution did not meet that threshold.

Section 3208.3(h) addresses a different question: Whether a psychiatric injury was substantially caused by lawful, nondiscriminatory, good-faith personnel actions. The party asserting that defense bears its burden. Section 3208.3(b)(3) defines substantial cause as at least 35 to 40 percent of causation from all sources combined. The numerical thresholds cannot be exchanged simply because both appear in the same statute or report.

The Board applied the sequence described in Rolda v. Pitney Bowes, Inc., 66 Cal. Comp. Cases 241, 245–247 (WCAB 2001) (en banc). The judge first identifies actual employment events and determines whether competent medical evidence establishes the necessary industrial causation. If that showing is made and the defense is raised, legal findings about personnel actions and good faith combine with medical evidence about their causal contribution.

Here, the sequence stopped at the initial causation showing. Because the competent medical evidence attributed only 40 percent to employment, the employer did not need to establish the affirmative personnel-action defense. The judge was not required to finish that branch of the analysis. This is the actual reason the Board left the good-faith issue unreached.

The result was a denial, followed by a service-date correction

The Board denied the worker’s petition for reconsideration. It also stated that documents attached in violation of the reconsideration rule had not been considered. The official decision should therefore be read against the admitted medical record and the arguments it addressed, rather than treating additional attachments as evidence the Board accepted.

The later correction filled the blank service-date field with October 16. Keep the merits decision, correction and service records together if reviewing the procedural history. The October 22 correction is a verified development; it does not change the medical findings described above.

Read the percentage together with the question it answers

This is a WCAB panel decision, whose reasoning is persuasive rather than binding on other panels and judges. Its practical value is the order of the analysis and the evidence supporting the AME’s allocation. The current statute also contains a different causation rule for specified violent-act circumstances. Identify the applicable statutory branch before applying a number from another case.

Our guide to reading psychiatric causation percentages explains how to separate the worker’s injury threshold, the employer’s defense and disability apportionment. The workers’ compensation team can review the complete reports, the events and records the evaluator considered, the claimed injury period and the actual findings to identify which question remains disputed.