Cogito Clarity Data Model Practice Test 2026 – Complete Exam Prep

In EPIC, the central place where patient identity and demographic information are stored is the Master File (often called INI as well). This serves as the authoritative patient registry, giving each person a unique master record that all parts of the system reference. That master record is what ties every encounter, order, result, and document back to the same patient, ensuring consistent identification across modules.

Chronicles is EPIC’s storage structure that holds a wide range of clinical data tied to those patient identities, including encounters and other records. But the actual patient records—the canonical demographics and identifiers—reside in the Master File/INI, making it the correct choice for storing patient records.