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Value Set Authority Center (VSAC)

VSAC

The Value Set Authority Center (VSAC) is a tool and repository for creating and managing value sets. It serves as the official source for value sets used in CMS electronic clinical quality measures (eCQMs) and digital quality measures (dQMs). The National Library of Medicine maintains the VSAC and offers access through web browsers and application programming interfaces (APIs).

The VSAC offers downloadable files for each measure release. These files include complete value sets for eCQMs and dQMs, the Binding Parameter Specification, and the complete lists of Direct Reference Codes, retired codes, and utilized code systems. The VSAC also provides tools that let users search existing value sets, create new ones, and keep value sets aligned with current terminology versions. Users must obtain a free Unified Medical Language System license to access the VSAC.

Category
Development
Implementation
Who Uses Tool
Academics/Researchers
CDS Developer/Steward
Eligible Clinician
Hospital - Inpatient
Hospital - Outpatient
Health IT Developer/Vendor
Implementer
Measure Developer/Steward
Last Updated: May 08, 2026

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For technical questions about eCQMs, please log in to the ONC Project Tracking System, specifically the eCQM Issue Tracker.

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