Proposed changes to SNOMED CT to ICD-10 and OPCS-4 maps

NHS England would like your feedback on proposed changes to the SNOMED CT to ICD-10 and OPCS-4 cross maps.

Proposed changes to SNOMED CT to ICD-10 / OPCS-4 alternative target codes and map block assignment (DOCX, 177KB)

The deadline for feedback is 8 September 2026. Give your feedback using the survey on proposed changes to SNOMED CT to ICD-10 / OPCS-4 maps.

Proposed changes to SNOMED CT to ICD-10 and OPCS-4 maps

NHS England is seeking feedback on proposed changes to SNOMED CT to ICD-10 and OPCS-4 maps.

Find out more in the document Proposed changes to SNOMED CT to ICD-10 / OPCS-4 alternative target codes and map block assignment (DOCX).

To leave feedback, complete the Microsoft Form Survey on Proposed changes to SNOMED CT to ICD-10 / OPCS-4 maps by Friday 7 August 2026.

Aligning the SNOMED CT UK Drug Extension model with SNOMED International

Following the Delen news article on the phase 3 and 4 changes to the SNOMED CT UK Drug Extension, NHS England will go live with the phase 3 and 4 changes as a joint release in 42.1.0, due for publication on Wednesday 13 May 2026.

For more information, see NHS England's updating the SNOMED CT UK Drug Extension model page.

Email nhsdigital.ukmeds@nhs.net to discuss this work.

Increasing SNOMED International description length limits

Following the Delen news article on the proposal to increase description length limits, SNOMED International has published a briefing note, available on Delen:

MF Briefing Note - Transition plan for Description Type length limits

A blog post with more information is available on the SNOMED International website:

Blog: SNOMED International concludes community feedback period on proposed description character limit increase and finalizes next steps

Email support.digitalservices@nhs.net with any questions.

Aligning the SNOMED CT UK Drug Extension model with SNOMED International

Following the phase 2 changes released in February 2026, NHS England is progressing with phases 3 and 4 of the SNOMED CT UK Drug Extension model update. These will be delivered as a single combined release.

Updated webpage content is available, including details of AMP and AMPP changes, with examples and diagrams.

Test files incorporating the phase 3 and 4 changes are available on Delen.

NHS England plans to go live with these changes in quarter 2 of 2026.

To prepare for go-live, NHS England is seeking your feedback via the drug extension model survey to understand potential impacts, and would greatly value your insights and feedback by 9am on Thursday 23 April 2026.

For more information, see NHS England's updating the SNOMED CT UK Drug Extension model page.

If you have any issues completing the survey, or would like to discuss this work further, email nhsdigital.ukmeds@nhs.net.

SNOMED International rationalisation of Unit of Measure concepts

SNOMED International is making changes to 2 overlapping hierarchies:

• 732935002 |Unit of presentation|
• 408102007 |Unit dose (qualifier value)|

These changes will result in the inactivation of duplicate concepts across both sub-hierarchies. Both sub-hierarchies are subtypes of 767524001 |Unit of measure (qualifier value)|.

Read more about these changes on Delen (opens in new tab).

Some affected "Unit of product usage" concepts are used in the NHS dictionary of medicines and devices (dm+d) as Units of Measure.

NHS England is seeking feedback from dm+d and SNOMED CT Drug Extension users to understand the potential impact on systems, workflows, processes and end users. Your input will help NHS England plan and implement any changes effectively.

Complete the survey (opens in new tab) by 5pm on Friday 24 April 2026.

If you have any questions or would like to discuss this further, contact information.standards@nhs.net.

Aligning the SNOMED CT UK Drug Extension model with SNOMED International

NHS England posted an update on Delen in December 2025 about the planned phase 3 and phase 4 changes to the SNOMED CT UK Drug Extension. NHS England asked for feedback on its plan to publish the changes as a single, combined release. It did not receive any concerns by 15 January 2026, so it will proceed with this approach.

To help NHS England understand the impact of these changes, it plans to publish a survey in March 2026 with test files. This will let you review the phase 3 and phase 4 changes and provide feedback.

For more information, see NHS England's updating the SNOMED CT UK Drug Extension model page.

To discuss this work further, email nhsdigital.ukmeds@nhs.net.

Aligning the SNOMED CT UK Drug Extension model with SNOMED International

Further to the news posted on Delen regarding the planned phase 2 changes to the SNOMED CT UK Drug Extension, NHS England will go live with the phase 2 changes in release 41.5.0, due 18 February 2026.

NHS England will release a user survey and accompanying test files for the phase 3 (AMP) and phase 4 (AMPP) changes to understand user impacts. They plan to go live with the phase 3 and phase 4 changes together in a joint release.

If you anticipate any issues with this approach, contact them by 15 January 2026: nhsdigital.ukmeds@nhs.net

For further information about this work, see NHS England's updating the SNOMED CT UK Drug Extension model page.

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