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Implementation

Unified Medical Language System® (UMLS®)

eCQM Tool -
(Last updated: Dec 10, 2025)
The Unified Medical Language System® (UMLS®) is a set of files and software bringing together health and biomedical vocabularies and standards to enable interoperability between computer systems. The UMLS integrates and distributes key terminology, classification and coding standards, and…

US Core

eCQM Tool -
(Last updated: Dec 09, 2025)
US Core is a set of rules and best practices that help healthcare providers share patient information safely and efficiently across the United States. It uses the FHIR standard to align how data—such as patient records, medications, and lab results—is formatted and exchanged. These rules follow…

Value Set Authority Center (VSAC)

eCQM Tool -
(Last updated: Dec 10, 2025)
The Value Set Authority Center (VSAC) is a value set authoring tool and repository. It is the source of truth for value sets for CMS's electronic clinical quality measures. The National Library of Medicine maintains the VSAC and provides access via web browsers and APIs. The VSAC provides…

VSAC Support Center

eCQM Tool -
(Last updated: Dec 10, 2025)
The VSAC Support Center is the Help section of the Value Set Authority Center website. It provides information on how to use the VSAC, specific information for value set authors and stewards (e.g., how to create value sets), and additional information such as release notes and how to use the VSAC…

VSAC SVS API

eCQM Tool -
(Last updated: Feb 04, 2026)
The Value Set Authority Center (VSAC) Sharing Value Set (SVS) Application Programming Interface (API) allows the user to retrieve a single value set's expansion, with or without its metadata and definition version, using RetrieveMultipleValueSets and RetrieveValueSet, respectively. It is based on…
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