Workers’ Compensation · Primary-source case analysis

Erazo: Unrefuted Medical Reporting Supported Industrial Injury at Lien Trial

By Aneeta Mishra and Timothy Chan

Published September 12, 2026

Treatment lien claimants litigated whether Claudia Erazo sustained cumulative industrial injury as a janitor. The defense submitted a denial letter and attacked the medical histories, while the lien claimants relied on three reports from the treating physician.

The lien claimants bore the affirmative burden

Because entitlement to treatment-lien payment depended on industrial injury, the lien claimants stood in the worker’s shoes and had to prove injury arising out of and occurring in the course of employment by a preponderance of the evidence.

The physician supplied more than a bare conclusion

The doctor took a history, examined Erazo, described her janitorial work and symptoms, and expressed causation in terms of reasonable medical probability. The WCAB found the reports reasoned and adequate under the substantial-evidence standard.

An unsupported attack did not rebut the reporting

Defense counsel argued that the histories could not be trusted without independent corroboration, but offered no testimony or documentary evidence showing any history was inaccurate. The Board rejected a categorical rule requiring separate corroboration of an otherwise adequate, unrefuted medical history.

The formal evidentiary record still had to be corrected

Although the WCJ discussed the exhibits as admitted in the opinion on decision, that discussion was not itself an admission order. The WCAB granted reconsideration to formally admit the reports, then affirmed the industrial-injury findings.

Key takeaways

• Identify which party bears the burden on industrial injury at lien trial.
• Test whether the medical opinion rests on examination, history, and reasoned probability.
• Support attacks on medical history with record evidence.
• Make sure every relied-upon exhibit is formally admitted.