An MS-Excel spreadsheet itemising the data fields and codings in the Hospital Episode Statistics section.

This resource is not suitable for displaying within a web-browser.
It can be downloaded or viewed using the link: HESDataDic.xlsx

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ctsu.ox.ac.uk/ukb/ukb/docs/HESDataDic.xlsx