SNOMED CT UK Edition
Read more about SNOMED CT and derivative products on Delen.
Email questions or feedback to information.standards@nhs.net.
Items in this category Jump to summaries
SNOMED CT UK Clinical Edition Cross-map Historical Files, RF2: Full
SNOMED CT UK Clinical Edition, RF2: Delta
SNOMED CT UK Clinical Edition, RF2: Full, Snapshot & Delta
SNOMED CT UK Drug Extension, RF2: Delta
SNOMED CT UK Drug Extension, RF2: Full, Snapshot & Delta
SNOMED CT UK Monolith Edition, RF2: Snapshot
News for this category
Duplicate map entries in SNOMED CT to ICD-10 mapping file 41.2.0
NHS England has identified an issue in the SNOMED CT to ICD-10 mapping file included in the SNOMED CT UK Edition 41.2.0 release. The file der2_iisssciRefset_ExtendedMapUKCLFull_GB1000000.txt contains duplicate map entries.
A corrected SNOMED CT to ICD-10 mapping file will be released on 24 December 2025 as part of the 41.3.0 release.
For questions or support, contact: support.digitalservices@nhs.net
Increasing SNOMED International description length limits
SNOMED International has confirmed the planned change to increase the maximum length of Fully Specified Name (FSN) and Synonym descriptions from 255 characters to 4,096 characters.
This change will be implemented in the 1 July 2026 International Edition release and will come into effect in the October 2026 UK Edition release.
See the news article on Delen for more information.
NHS England is seeking views from SNOMED CT users in the UK through a survey to help identify if additional information or support may be needed to prepare for the change, and to understand the most effective ways to communicate and share that information.
Your feedback will help NHS England decide whether further guidance or engagement is required to support users beyond that which SNOMED International is providing.
Please complete the survey by 5pm on Wednesday 10 December 2025.
If you have any issues completing the survey, contact: information.standards@nhs.net
Read older category news in the news archive.
Item summaries
SNOMED CT UK Clinical Edition Cross-map Historical Files, RF2: Full
Retired cross-map RF2 files, Full release type only.
There is a release per retired cross-map containing the extended map reference set release file and associated documentation.
The data contained within the releases are for reporting or data warehousing - the maps should not be used for live data processing. Active cross-maps can be found in the main Clinical Edition RF2 releases.
Status: Supported Product
SNOMED CT UK Clinical Edition, RF2: Delta
Each release of this item contains the SNOMED CT UK Clinical Edition in Release Format 2 (RF2), Delta type only.
Each release includes the UK Clinical Extension and the International Edition, along with refsets, cross-maps and added-value content.
The Delta type includes only the changes since the previous release, including any new components.
For more information, see the SNOMED CT pages on Delen.
SNOMED CT UK Clinical Edition, RF2: Full, Snapshot & Delta
Each release of this item contains the SNOMED CT UK Clinical Edition in Release Format 2 (RF2), including all release types.
Each release includes the UK Clinical Extension and the International Edition, along with refsets, cross-maps and added-value content.
All RF2 release types – Full, Snapshot and Delta – are included.
For more information, see the SNOMED CT pages on Delen.
SNOMED CT UK Drug Extension, RF2: Delta
Each release of this item contains the SNOMED CT UK Drug Extension in Release Format 2 (RF2), Delta type only.
Each release includes the RF2 Delta files, drug-only refsets and added-value content.
These releases do not include the SNOMED CT UK Clinical Extension or the International Edition.
For more information, see the SNOMED CT pages on Delen.
SNOMED CT UK Drug Extension, RF2: Full, Snapshot & Delta
Each release of this item contains the SNOMED CT UK Drug Extension in Release Format 2 (RF2), including all release types.
Each release includes all RF2 types (Full, Snapshot and Delta), drug-only refsets and added-value content.
These releases do not include the UK Clinical Extension or the International Edition.
For more information, see the SNOMED CT pages on Delen.
SNOMED CT UK Monolith Edition, RF2: Snapshot
Each release of this item contains an integrated, fully merged set of the SNOMED CT UK Clinical Extension, the UK Drug Extension, the UK Pathology Extension and the International Edition, as a single set of files in Release Format 2 (RF2).
The merged tables are post-processed to resolve duplicates and conflicts that can occur when separate snapshots are combined.
Status: Draft for Trial Use
SNOMED CT UK test releases
Releases of new or updated terminology and classification products, or their derivatives, in draft, beta, preview and proof-of-concept form.
These releases give implementors and suppliers previews of updates and developments.
Materials made available here are for evaluation only and might never transition to production versions.
Email questions or feedback to information.standards@nhs.net.
Status: Technology Preview