Payne: Credibility Findings Could Not Replace Medical Injury Findings

A judge’s finding that a worker was not credible left essential medical and injury issues unanswered in Payne v. University of California, Los Angeles; Los Robles Regional Medical Center, Nos. ADJ10222709 and ADJ11429678 (WCAB Jan. 16, 2026). The Workers’ Compensation Appeals Board rescinded the decision and returned the cases for findings supported by the medical record, with a determination first whether further discovery was warranted.

This California WCAB panel decision concerns the findings needed to decide these two cumulative-injury claims. The remand required further adjudication; it left the worker with the burden of establishing compensable injury.

Two jobs and several unresolved trial issues

Janchai Payne alleged cumulative injuries during overlapping employment from May 2014 through November 2015. She worked as a laboratory technician for UCLA and a pharmacy technician for Los Robles, claiming injury to multiple body parts.

The issues submitted for trial went beyond whether Payne’s testimony was believable. They included industrial injury, a request to strike Dr. Klassen’s panel QME reporting, a request for an internal-medicine panel and further discovery. Los Robles also raised a post-termination defense and limitations issues.

The judge’s December 28, 2021 joint findings and order instead concluded that Payne lacked credibility and declared the other issues moot. The accompanying reasoning referred to incomplete histories, a notebook and her demeanor. The Board had previously granted reconsideration to study the issues. Its January 16, 2026 Decision After Reconsideration examined whether the findings actually resolved the claims. The submitted issues and the judge’s approach appear in Payne.

Credibility was relevant, but injury still required findings

Labor Code section 5313 requires findings on the facts involved in the controversy, including the ultimate facts needed to decide the claim. The Board also relied on Hamilton v. Lockheed Corporation, 66 Cal. Comp. Cases 473, 476 (WCAB en banc 2001): The opinion on decision must explain its basis so the parties and the Board can meaningfully review it. The Board explained that whether Payne sustained injury arising out of and occurring in the course of employment was an ultimate issue requiring a finding. A conclusion about credibility alone did not answer it.

Credibility can affect which alleged work events occurred and whether a physician relied on an accurate history. Medical causation presents a further question. The Board relied on Insurance Company of North America v. Workers’ Compensation Appeals Board (Kemp), 122 Cal. App. 3d 905 (1981), and related authorities in explaining that scientific medical issues generally require expert evidence. A judge’s personal view cannot substitute for that evidence.

The resulting task is to connect the accepted facts to the medical opinions. If a history is inaccurate, the decision needs to account for its effect on the medical analysis. Declaring a witness unpersuasive does not explain whether the admitted reports establish injury, fail to establish it or need clarification.

Further medical development had a threshold

Payne had asked for additional medical discovery and an internal-medicine panel, while also challenging existing QME reporting. The Board directed the judge to decide whether further discovery was warranted before issuing the necessary injury findings.

That instruction came with a standard. Relying on McDuffie v. Los Angeles County Metropolitan Transit Authority, 67 Cal. Comp. Cases 138, 141 (WCAB en banc 2002), the Board explained that a judge has authority to obtain additional medical evidence during the proceedings. Before augmenting the record, the judge or Board must identify a specific deficiency in the existing medical opinions. The parties first need to identify what is missing or defective in the existing opinions. A request for more evidence does not itself establish that another panel is required.

This is the important connection between the discovery requests and the eventual injury ruling. A necessary medical question cannot be resolved by unsupported judicial inference, but development of the record still needs a reason tied to the evidence. The Board’s analysis and directions appear in Payne.

The cases returned for an actual determination

The Board rescinded the joint findings and order and returned both cases for further proceedings. The judge was to determine first whether further discovery was warranted and then make the required findings on industrial injury based on the medical evidence. Credibility would still help determine whether the alleged cumulative-trauma events occurred; it could not alone supply the ultimate medical injury determination. The previously submitted issues needed resolution as appropriate in that adjudication.

For a worker, the practical value of the decision lies in reading a denial against the issues actually submitted. Does the decision answer whether each alleged injury was industrial? Does it identify the medical evidence supporting that answer? What happened to a request for clarification or additional discovery?

A credibility dispute and a medical-evidence problem can exist in the same case. Payne requires that the decision address their respective roles. The companion Insight explains how to identify unanswered medical questions before an injury trial.