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HES data dictionary

Data dictionaries work in the same way as 'normal' dictionaries, but they contain information about data items.

The HSCIC is currently undertaking a review of the HES data dictionaries published on this website. The review has identified some outdated or incomplete entries. Care is advised in using the dictionaries until they are updated, which is planned for the near future. In the meantime, please send any data dictionary queries to enquiries@hscic.gov.uk referencing HES data dictionaries in the subject.


What is the HES data dictionary?

The HES data dictionary contains detailed information on the fields from the admitted patient, outpatient, A&E and adult critical care data sets that are collected by HES and the PROMs data set. These include those submitted directly by the data providers and also fields we derive and add to the data sets. The admitted patient dictionary also identifies which cleaning or derivation rules have been applied to which fields.


Who is it for?

All users of HES data.


NHS Data Dictionary

The fields within HES are either based on or derived from the NHS Data Dictionary. This covers all data sets and data items used in the NHS, not just those from which HES is extracted. It is developed and maintained by the Data and Information Standards team at NHS Connecting for Health.

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