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Unit Statistical Data Reporting

Unit statistical data refers to specific data elements, including payroll (exposure) and loss information, which must be submitted for every workers' compensation insurance policy providing coverage under the workers' compensation laws of California, including California coverage by endorsement on a policy primarily covering another state. On multi-state policies, data pertaining only to California coverage is to be submitted.

A Unit Statistical Report (USR) must be submitted for every policy, even if written on an "if any" basis. Data must be filed in accordance with Part 4, Unit Statistical Reporting Requirements, of the California Workers' Compensation Uniform Statistical Reporting Plan - 1995 (USRP).

The first time a claim must be valued for unit statistical reporting is 18 months after the policy inception month. This 18-month valuation is required to be reported on a "first report level" USR, and submitted to the WCIRB no later than 20 months after the policy inception date. The first report also includes exposure data. Claims that are still open as of the first report are required to be valued and reported again 12 months later (30-month valuation, submitted to the WCIRB no later than 32 months after the policy inception date) on a "second report level." This process continues until either all claims are closed or until 10 report levels are reached, whichever comes first. See additional information on unit statistical reports in the Online Guide to Workers' Compensation - California's Experience Rating System  found in the Learning Center of this website. 

Submission Creation and Transmission

All unit statistical data must be reported electronically and transmitted via the Compensation Data Exchange (CDX) web-based service.  Hard copy USRs are not accepted.

The format for electronic reporting of unit statistical data is WCSTAT, which consists of 250-byte records with fixed field positions. If any record within the file is greater or less than 250 bytes, WCIRB Connect® will not accept the file. USR data must be submitted in accordance with the USRP and specifications set forth in the WCIO's Workers' Compensation Statistical Reporting Specifications (WCSTAT) as applicable in California.

Insurers may use the web-based Bureau Edit and Entry Package (BEEP) on the CDX website to create and/or validate USRs before submitting them to the WCIRB. 

Submission Testing

Each insurer and authorized third party entity (TPE) must submit a test file for approval by the WCIRB prior to submitting production files.  Please review the guidelines in the USR Submission Test Requirements section, and then contact the WCIRB Data Submission Analysts at [email protected] to arrange the test.

WCIRB Unit Statistical Data Quality Program

Insurer groups meeting a certain eligibility threshold are required to participate in the WCIRB Unit Statistical Data Quality Program. 


The following resources may be helpful: