Skip to main content

Terminology and Classifications

National standards for recording and categorising information to support care delivery, statistical analysis, research and the reimbursement of health and care providers.

Top tasks

COVID-19 and Information Standards
Regular updates on clinical guidance, terms available that relate to COVID-19 in a single diagram, SNOMED CT releases, ICD-10 and OPCS-4 are brought together.

Work together and share on Delen
Use our Delen site to reach product documents, databases and tools. Access latest news, developments, opportunities and publications, plus education, training and exam information. Search the Resource Library for specific items, like the Coding Clinic.

Download e-learning, technical files and documentation
From our TRUD download website, which allows NHS Digital to license and distribute reference data.

Contact details

Contacts and links

Further information

  1. internal

    Clinical Classifications

    The OPCS Classification of Interventions and Procedures (OPCS-4) is a statistical classification of interventions and procedures undertaken in the NHS. These classifications are a mandatory requirement for the NHS Admitted Patient Care Commissioning Data Sets and have a vital role in UK secondary care reporting of episodes of care and reimbursement.

  2. internal

    Read Codes

    Read Codes are a coded thesaurus of clinical terms. There are two versions: version 2 (v2) and version 3 (CTV3 or v3).

  3. internal


    SNOMED CT is a structured clinical vocabulary for use in an electronic health record. It is the most comprehensive and precise clinical health terminology product in the world.

  4. internal

    Terminology and Classifications news

    Subscribe to our Terminology and Classifications news for latest updates about our products and services, information about SNOMED CT implementation and release updates, SNOMED International developments, and career opportunities.

Last edited: 20 April 2020 10:13 am