Quick Answer
A California workers' compensation experience modification, often called an X-Mod, is one factor used in the WCIRB experience-rating system for eligible employers. It compares an employer's actual loss experience with expected losses for comparable risks. It is not a subject to policy terms and underwriting percentage discount, and it does not replace review of payroll, classification, operations, limits, deductibles, carrier appetite, and other underwriting factors.
What the X-Mod Measures
Experience rating uses reported payroll and loss information over the applicable experience period. The resulting factor is intended to reflect loss experience relative to expected experience for comparable California risks. Eligibility, calculation details, and effective dates should be confirmed with the carrier, broker, or WCIRB materials because the system and business circumstances matter.
How Contractors Can Prepare
- Review loss runs and unit-statistical information for accuracy.
- Confirm that payroll and workers' compensation classifications match the work actually performed.
- Maintain documented safety and return-to-work practices.
- Report claims promptly and coordinate claims information with the carrier.
- Ask a licensed broker to explain how the current factor is reflected in the renewal indication.
No broker can promise a particular X-Mod or premium reduction. Actual pricing and eligibility depend on the account, carrier, classification, claims, payroll, and underwriting.
Official Source
See the WCIRB California Experience Rating System and discuss account-specific questions with your carrier or licensed broker.
Need help reviewing a California contractor workers' compensation renewal? Request a licensed broker review; availability and terms depend on underwriting.