A Technical Guide to Epic Clarity for Healthcare Data Engineers

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Epic EHR is installed in roughly 38% of U.S. hospitals, making its relational reporting database, Epic Clarity, a critical tool for healthcare data engineers. Clarity stores a read-optimized copy of clinical, administrative, and operational data extracted nightly from Epic's proprietary operational store, Chronicles. Because Clarity runs on Microsoft SQL Server, it can be queried by any SQL-proficient engineer and serves as the primary data extraction point for analytics teams building warehouses on platforms like Snowflake, Databricks, and BigQuery. The Epic data architecture consists of four layers — Chronicles, Clarity, Cogito, and Caboodle — each serving a distinct purpose in the analytics pipeline. A newly published guide covers Clarity's core table structure, naming conventions, and key joins to help engineers navigate its thousands of tables more effectively.

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