Read Codes


Read Codes are a coded thesaurus of clinical terms and have been used in the NHS since 1985. There are two versions: version 2 (v2) and version 3 (CTV3 or v3) and both provide a standard vocabulary for clinicians to record patient findings and procedures in health and social care IT systems across primary and secondary care.

Retirement of Read Version 2 and Clinical Terms Version 3

The last updated release of Read v2 (clinical and drugs) was in April 2016.  The April 2018 release was the last scheduled update of CTV3.  The final updates of Read v2 and CTV3, together with the UK Read Browser, are now only available on request by contacting Static files for the classifications cross-maps from Read v2 and CTV3 to ICD-10 and OPCS-4 will continue to be available, as will SNOMED CT to ICD-10 and OPCS-4 Classification Maps.

Organisations should be well underway with their preparations to ensure they can use dm+d for medicines and SNOMED CT for clinical content.  Information relating to SNOMED CT, its adoption across the NHS and current programmes supporting implementation can be found on our SNOMED CT page. 

Access documents associated with the use and application of Read CTV3.

Changes to the April 2018 release

Terming and Technical updates
Terming and technical updates are included with the main release of the Read Codes. These summary reports give details of terming and technical changes made to Version 3 since the previous release (for more detail on the term changes/additions, see the Change Reports Description document.

Click on the links below to view the CTV3 terming and technical updates:

Change Reports

Change reports are issued with the main release of the Read Codes. These reports list additions and other changes made to the Read Codes since the previous release.

Click on the links below to view the CTV3 reports:

For further information on these files, see the Change Reports Description document.

Summary of new additions

How can I request a change?

Following the final updated release of Read v2 in April 2016 and the final updated release of CTV3 in April 2018, requests for changes to either of these terminologies can no longer be submitted.  Requests for new concepts should be submitted via the SNOMED CT product menu of the Request Submission Portal (RSP). You will need to register the first time you use the portal. 

Retirement of Read Codes Drug and Appliance Dictionary (DAAD)

The Read Codes DAAD was released for the final time on 01 April 2016. All releases have been removed from TRUD and access to the release is now via File Transfer Protocol (FTP) only on request.

Access documents associated with the use and application of Read DAAD.

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