These resources provide information for people interested in learning about how different states define the rules for what can and should be collected in an all-payer claims database. States currently define those rules differently, but work is underway to harmonize those rules. For more information about the work being done to harmonize the rules for data collection, please send an email to

To learn more about APCD standardization, please read our fact sheet Standardization of Data Collection in All-Payer Claims Databases. A timeline of the history of APCD Council harmonization efforts can be found here or on our Publications page.