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When did CMS begin using CQL in electronic clinical quality measures (eCQMs)?
CMS first implemented CQL beginning with the calendar year 2019 performance/reporting period eCQMs. CQL replaces the logic expressions previously defined in the Quality Data Model (QDM). Beginning with QDM v5.3, QDM includes only the conceptual model for defining the data elements (the data model).
Last Updated: Jun 26, 2025