Formal subset/refset files are published in the main data packs. The files in this area are provided so that subset memberships bound up in the main data release packs can be quickly and easily accessed and viewed without specialist access to the whole of SNOMED CT. They are categorised by subject for convenience.
IMPORTANT: These files are NOT in an official SNOMED CT release format. NHS Digital publishes subsets in Excel format solely for easy content preview. This file format does not support mandatory SNOMED CT change management and these files must NOT be used as the source of SNOMED CT data for live clinical systems.
Please note that this is primarily a download site. Please go to our product support pages for more detailed information on SNOMED CT subsets and these spreadsheet files. Details about each subset can also be found on the Data Dictionary for Care site.