During the first open enrollment period under the Affordable Care Act, the federal government and states operating state-based exchanges conducted various types of reporting on key indicators of interest to policymakers and the public. There was variation in the definitions employed by different states, and this is expected to continue into the future. As the second open enrollment period nears, several states have expressed interest in better understanding how their counterparts are defining and using key terms in public reporting. This document is a compendium of the terms and definitions most commonly used in the first open enrollment period; it is hoped that this resource will be useful to states both for planning future reporting and for facilitating cross-state understanding and comparison.

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