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SNOMED CT derivative products

Products from the UK Terminology Centre have one of these statuses:

  • In Development
  • Technology Preview
  • Draft for Trial Use
  • Supported Product
  • Deprecated
  • Retired

Read the IReS Terminology Product Development Lifecycle (external PDF) for explanations of these statuses.

Email questions or feedback to information.standards@nhs.net.

Items in this category

Legally restricted patient confidential reference data

NHS Digital is currently undertaking a review of clinical codes that are defined as sensitive (legally restricted) to ensure that its use of provider data is compliant with the Human Fertilisation and Embryology Act 1990 (as amended by the Human Fertilisation and Embryology Act 2008) and the Gender Recognition Act 2004 (as amended by The Gender Recognition (Disclosure of Information) (England, Wales and Northern Ireland) Order 2005).

As part of this work, NHS Digital are seeking feedback on a proposed list of legally unshareable clinical codes. The codes that have been identified will continue to be used for secondary purposes, but all related information that could potentially identify an individual would be removed where the codes are used for any other reason apart from direct care.

Feedback will be used to finalise this list of codes, which will be then available for use across the health care system and within national data sets.

The closing date is 19 January 2018. Find out more and take part.

Part of the Legally Restricted patient confidential data change standard ISB 1572 Sensitive Data.

Includes the updated clinical code lists for In Vitro Fertilisation (IVF) and Sexually Transmitted Diseases (STD) across the following terminologies and classifications:

  • SNOMED CT
  • 5-byte Read Codes Version 2
  • Clinical Terms Version 3
  • ICD-10
  • OPCS 4

Status: Technology Preview


  • Releases (2)
  • Licences (4)

NHS Data Migration

Releases of this item contain products intended to support the GP Summary Care Record, Systems of Choice and Data Migration programmes. Specifically:

  • many:one ‘forward’ crossmaps from the England and Scotland releases of Read Version 2 to Clinical Terms Version 3, from Read Version 2 to SNOMED CT, and from Clinical Terms Version 3 to SNOMED CT
  • many:one ‘backward’ crossmaps from Clinical Terms Version 3 to Read Version 2
  • tables assigning NHS Care Record Elements to all Read Version 2, Clinical Terms Version 3 and SNOMED CT codes - these mapping tables are distributed in a non-standard file format, together with supporting documentation

Releases also include experimental SNOMED CT Navigational Subsets by which simulacra of the Read Version 2 and Clinical Terms Version 3 taxonomies may be recreated as views on the full SNOMED CT content.

Read important information on the retirement of Read Version 2 and Clinical Terms Version 3.

Following consultation, the final release of the Read Version 2 to SNOMED CT mapping tables was April 2020. Releases of this item are now unmaintained static data.

Unscheduled releases may occur until April 2023, but only in order to resolve critical clinical safety issues.

Status: Deprecated


  • Releases (4)
  • Licences (2)

PBCL Read Code to SNOMED Code Translation Table

A set of map tables translating the Read Codes in the PBCL EDIFACT laboratory report message to SNOMED CT codes to support transmission, reception, storage and retrieval of primary care pathology results.

Status: Supported


  • Releases (5)
  • Licences (2)

SNOMED Antecedent Versions Data Migration

Mapping tables and guidance to enable historical data previously captured using an antecedent legacy version of SNOMED II, 3.x International or SNOMED RT to be migrated to SNOMED CT.

Expected use cases include, but are not limited to, histopathology laboratories and their Laboratory Information Management Systems and suppliers, and secondary users of histopathology data including Cancer Registries.

Status: Technology Preview


  • Releases (1)
  • Licences (2)

SNOMED CT speciality reference sets

Speciality reference sets derived from SNOMED CT.


  • Releases (8)
  • Licences (2)

SNOMED CT UK Query Table and History Substitution Table

Releases of this item contain 2 related derivatives of the SNOMED CT UK Edition to aid the processing of inactive content within systems and data repositories.

The History Substitution Table provides a single table identifying valid substitutions for concepts that are now inactive, along with metadata about that substitution; it is computed using the historical relationships within the main SNOMED CT release but presented as a simpler look-up table.

The Query Table is an extension to a normal SNOMED CT transitive closure table, taking into account the History Substitutions Table and other data. It provides a mechanism to achieve optimal data retrieval, regardless of inactive and active concept status in data or query definitions. The Query Table is recommended as a mechanism for ensuring inactive content is still returned in searches, and is specifically recommended by the Joint GP IT Committee for use in primary care systems.

Status: Supported


  • Releases (10)
  • Licences (2)

UK Drug bonus files

SNOMED CT UK Drug Extension ePrescribing support files in Microsoft Excel and XML format, and the NHS dictionary of medicines and devices (dm+d) Parsed files.


  • Releases (9)
  • Licences (2)

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