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NHS Data Model and Dictionary Service

The NHS Data Model and Dictionary develops, maintains and supports NHS data standards. It gives a reference point for assured information standards, to support health care activities in the NHS in England.

NHS Data Model and Dictionary
This offers data sets specifications, for use in the NHS.

Data Dictionary Change Notices (DDCNs)
View all changes that do not affect information standards.

Download XML Schemas
Use the TRUD website to download XML Schemas.

Guidance for known queries (archive site)
View our answers to known help desk queries.


View help for navigating the NHS Data Model and Dictionary, including demonstration videos.


The content of the NHS Data Model and Dictionary is assured by the Standardisation Committee for Care Information (SCCI), which governs and publishes information standards.




ISO 9001 certification Europe


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