The requirements for California workers' compensation information system (WCIS) reporting are administered by the California Division of Workers' Compensation (DWC) and have a wider scope of data fields reported. The information collected is used to oversee the state's workers' compensation system. WCIS reporting will continue to be administered by the DWC after the WCIRB's Medical Data Call requirement commences.

The requirements for California Medical Data Call reporting are administered by the WCIRB and the data fields that are reported were selected to meet specific needs related to the WCIRB's ratemaking responsibilities. While the requirements of the two systems differ, the Medical Data Call requirements were reviewed in the context of the WCIS requirements to make sure that there are no major inconsistencies in which a particular field has significantly different meanings between the two systems.