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Research and Analysis

Research and Analysis

In this section, you will find data, research and information about the California workers' compensation system.

Latest Reports Released by the WCIRB

State of the California's Workers' Compensation System Reports

The WCIRB's annual report summarizing the cost of workers’ compensation insurance based on premiums paid by insured employers, shows how premium dollars are distributed among various system components, and identifies key cost drivers such as frequency and the average cost of claims. Read more>

Research Related to SB 863

WCIRB's cost monitoring plan and reports focusing on the impact of system costs of SB 863 as they emerge in statewide loss and loss adjustment expenses can be found here . Read more>

Summaries of Insurer Experience

Insurer experience summaries are released approximately three to five months after the end of the quarter. These reports contain information such as written premium, average cost of a claim, accident year combined loss and expense ratios, etc. Read more> 

Losses and Expenses Summary Reports

These reports are prepared pursuant to Section 11759.1 of the California Insurance Code. The reports contain detailed information about calendar year medical and indemnity costs; insurer losses and expenses; fees paid to attorneys; and workers' compensation costs by type of injury. Read more>

Research Related to Loss Development

These reports summarize the WCIRB's analysis of the impact of legislative changes on paid loss development patterns and other trends in loss development. Read more>

Research Related to Claim Frequency

These reports summarize the WCIRB's analysis of recent changes in claim frequency as well as geographic differences in workers' compensation claim costs. Read more>

Classification Research Reports

These reports are presented to the WCIRB's Classification and Rating and Governing Committees, and may be included in a WCIRB regulatory filing submitted to the California Insurance Commissioner for approval. Read more>

Other Data and Reports

Aggregate Medical Payment Trends, Summary of Policy Year Statistics and other research reports are available here. Read more>

WCIRB Research Forum

View recordings of past WCIRB Research Forum webinars that focus on recent releases of data or research from the WCIRB and its research partners. Read more>


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