California WC Loss Development, AY 2016-2025
California workers’ comp loss costs continued to rise over the past decade despite disruptions caused by the COVID-19 pandemic according to a new CWCI analysis of loss development before, during and after the pandemic. A news release is available under the News tab and a more detailed summary is in Bulletin 26-13. The full report is available for free to members and subscribers who call 510-251-9470, nonmembers may purchase a copy for $21.
Calif CT Claims: 2018–2025: Trends and Factors Associated with Growth
New CWCI research tracks the growth of CT claims in California and analyzes the extent to which various factors may be driving that growth. The Report to the Industry is in the Research section of our website, while the results have also been summarized in Bulletin 26-12 and a press release in the Newsroom.
Medical Inflation and Cost Drivers in California Workers’ Comp
The CWCI research found that from 2017 to 2024, California workers’ comp medical inflation was largely driven by rising prices — rather than utilization — for services billed under unlisted procedure codes where fees are not constrained by fee schedule pricing controls.
Psychotherapeutic & Neurological Drugs
CWCI uses data from its IRIS database and its Prescription Drug Interactive App to explore what is behind the growth in payments for Psychotherapeutic & Neurological Drugs in the California…
CWCI Presents
CWCI’s 63rd Annual Meeting on Wednesday, March 24, 2027 at The Sofia in Sacramento.
Product Highlights
Loss Development: Medical & Indemnity Payments on AY 2016–AY 2025 Claims
A CWCI Research Update report uses IRIS data on insured and self-insured indemnity claims from AY 2016–AY 2025 to provide an updated view of California WC medical and indemnity loss trends before, during, and after the pandemic. The full report is free to members and subscribers by calling 510-251-9470, others may purchase a copy for $21.
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Research Reports
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For Members Only: Introduction to CWCI’s Cumulative Trauma Rate Interactive Application
A CWCI Interactive Research Report that provides an overview of the Institute’s Cumulative Trauma Rate Interactive Application, which features the primary IRIS metrics analyzed in the Institute’s August 2026 Report to the Industry, Calif CT Claims: 2018–2025: Trends and Factors Associated with Growth. The Interactive Research Report serves as a helpful users’ guide to the…
CWCI Study Examines AY 2016-2025 Loss Development
Loss Development Over the Past Decade: The pandemic temporarily disrupted California workers’ comp loss trends but did not stop the steady growth in medical and indemnity claim costs, and a new CWCI study indicates that medical costs may be accelerating in the post-pandemic era. More details are available under the news tab and in Bulletin…
Calif CT Claims: 2018–2025: Trends and Factors Associated with Growth
A new CWCI study finds that the growth of CT claims in California workers’ comp cannot be fully explained by factors such as employment or population growth, overall claim frequency, or changes in the composition of the workforce. Instead, the increase appears to reflect broader structural changes within the system, with one of the most…
Medical Inflation and Cost Drivers in the California Workers’ Compensation System
CWCI’s follow-up study on medical inflation in California workers’ comp reviews prices, utilization and billing practices across major medical service categories. The report traces much of the recent growth in medical costs to the increased use of unlisted billing codes which are not subject to fee schedule price controls, especially for professional services and DMEPOS. …
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