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 HES Data Dictionary also identifies which cleaning or derivation rules have been applied to which fields. The cleaning rule definitions, used in conjunction with the HES Data Dictionary, are available here:
