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This is an abbreviation for Common Terminology Services 2

An Application Programming Interface ( API) specification that is intended to describe the basic functionality that needed by healthcare software implementations to query and access terminological content. CTS2 defines the functional requirements of a set of service interfaces to allow the representation, access, and maintenance of terminology content either locally, or across a federation of terminology service nodes.


  • CTS2 is specified as an API rather than a set of data structures to enable a wide variety of terminological content to be integrated within a common framework without the need for significant migration or rewrite.
  • CTS2 was developed from the original the [see HL7 CTS specification] and is now a joint initiative between HL7 and the [see Object Management Group (OMG) ].


  • CTS2
  • HL7 CTS2