Employer Coverage Information via Workers' Compensation Insurance Rating Bureau
Workers' Compensation Coverage Inquiry (WCIRB)
Determine whether an employer is insured for workers' compensation. The coverage information may not be complete for all employers due to limitations with the policy information, such as similar or duplicate employer names, multiple or alternate locations and addresses for employers, or more than one named insured employer on an insurance policy. (https://www.caworkcompcoverage.com/)
Self-insured employers are overseen by the California Department of Industrial Relations Office of Self Insurance Plans.