The WCIRB actuarial and research teams publish brief research studies on issues affecting the California workers’ compensation system. We will post the studies here once they are released. To be notified when WCIRB research briefs are released, subscribe to our WCIRB Email Alerts.

• COVID-19 in California Workers' Compensation – 2022 Update (released October 12, 2022)
   
• COVID-19 in California Workers’ Compensation – October 2021 Update (released October 29, 2021)
   
• Cost Impact of California’s Drug Formulary – Two-Year Checkup (released February 9, 2021)
   
• Impact of Economic Downturn on California Workers’ Compensation Claim Frequency (released June 1, 2020)
   
• Evaluation of Cost Impact of Governor Newsom’s Executive Order on Rebuttable Presumption for California COVID-19 Workers’ Compensation Claims (released May 22, 2020)
   
• Cost Evaluation of Potential Conclusive COVID-19 Presumption in California Workers’ Compensation (released April 20, 2020)
   
• Treatment Patterns of Medical Providers Indicted for Fraud in California Workers' Compensation (released December 3, 2019)
   
• California’s New Drug Formulary – One-Year Checkup (released August 30, 2019)