The World Health Organization (WHO) International Classification of Diseases (ICD) is the global standard which categorises and reports diseases in order to compile health information related to deaths, illness or injury; the current version is at 10th revision. All inpatient episodes and day cases that contain diagnoses must be recorded to the mandated version of ICD. 

Who owns ICD-10 and how often is it updated?

ICD-10 is published by the WHO and is updated in the UK every three years. Previous versions are listed below, along with the financial year in which they were mandated for use. The implementation date for each version is always 01 April:

  • ICD-10 5th Edition - 2016 onwards
  • ICD-10 4th Edition – 2012

  • ICD-10 reprinted (with updates and corrections) 2000 – 2004
  • ICD-10 – 1995
  • How can I access other ICD-10 related resources?

The Standardisation Committee for Care Information (SCCI) approved the ICD-10 5th Edition for NHS implementation on 01 April 2016. The Information Standards Notice describes the mandate for NHS implementation.

ICD-10 e-Version

We provide electronic versions (eVersions) of both ICD-10 and OPCS-4, more information is available on our Classifications Browser and e-Versions page.

ICD-10 Reference Books

ICD-10 must be used in combination with the associated ICD-10 Rules, Conventions, Standards and Guidance which are published in the ICD-10 Reference Book. The Reference Book is updated on a yearly basis and published around January/February on Delen to allow users to familiarise themselves with any changes made to standards that must be used between 01 April and 31 March of each financial year. The current and previous versions of the Reference Books are available in the Resource Library. The financial year which the standards apply to is indicated in the title of the Reference Book.

All ICD-10 resources can be accessed in the Resource Library.

Downloading ICD-10 data files

ICD-10 data files for NHS and system supplier implementation are available to download from the TRUD website

ICD-10 5th Edition Volume Set

You can order the ICD-10 5th Edition books from The Stationary Office (TSO).

ICD-10 5th Edition Errata

A number of errors have been identified in the printed ICD-10 5th Edition volumes published by the WHO. As a result we have compiled a single errata list which contains all changes that must be made in the printed ICD-10 5th Edition books. This can be found in the NHS ICD-10 5th Edition Errata within ICD-10 and OPCS-4 Classifications Content Changes [2022].

A number of these errors are also replicated in the ICD-10 5th Edition eVersion, therefore we have a set of shared notes, available on our Classifications e-Versions page replicating the errata entries which can be imported into the eVersion. 

The ICD-10 and OPCS-4 Classifications Content Changes [2022] also contains the changes users need to make in the ICD-10 5th Edition books to the fourth character codes in categories W26 Contact with other sharp objects, X34 Victim of earthquake and X59 Exposure to unspecified factor.

ICD-10 5th Edition Emergency Use codes in Categories U06 and U07

Codes in categories U06.- Emergency use of U06 and U07.- Emergency use of U07 must only be used when specifically instructed by the Terminology and Classifications Delivery Service under direction from the WHO (ICD-10 National Clinical Coding Standard DCS.XXII.3: Emergency use codes (U06 and U07)).

There are now a number of codes within these categories that have been designated for use for Zika Virus (U06.9), Vaping (U07.0) and COVID-19 (U07.1-U07.5). The codes within categories U06 and U07 are available within the ICD-10 5th Edition Codes and Titles file and the WHO ICD-10 Volume 1 Tabular List but their descriptions remain as ‘Emergency use of’ as it would be too great a burden on users to issue an update to the files.

In order to assist users of the eVersion we have created a set of shared notes reflecting the code descriptions of the codes designated for emergency use within categories U06 and U07 that can be imported into the eVersion. These are available on our Classifications Browser and e-Versions page

For more information on the emergency codes in categories U06 and U07 see the following within the ICD-10 National Clinical Coding Standards ICD-10 5th Edition Reference Book:

  • COVID-19 National Clinical Coding Standards and Guidance
  • DCS.I.5: Zika virus
  • DCS.XXII.4: Vaping related disorder (U07.0)

Key Messages

Will SNOMED CT replace ICD-10 and OPCS-4?


SNOMED CT, ICD and OPCS-4 are nationally required standards that serve different but related and complementary purposes. In simple terms, SNOMED CT enables the detailed recording of information to support the provision of care, whereas ICD and OPCS-4 enable the statistically valid counting of diseases, other health conditions, interventions and procedures to support epidemiology and health care management.

Will clinical coders be needed once SNOMED CT has been implemented across the NHS?


Finished Consultant Episodes (FCEs) are coded by clinical coders, using the classifications products in accordance with national standards. The role of the clinical coder will evolve as electronic patient records (EPRs) become more common and as SNOMED CT and future classifications products (such as ICD-11) are implemented. However, the coding process requires experienced human beings to review the clinical notes, discuss with clinical colleagues and exercise judgement in the application of national standards to ensure that FCEs are coded reliably.

A presentation on how SNOMED CT and clinical coding can work together is available in the Resource Library.

Will Clinical Coding Audit and Training be part of the Data Security and Protection Toolkit?


Both Acute and Mental Health Trusts are deemed ‘Large Organisations’ in the Data Security and Protection Toolkit (DSPT).

Clinical coders must refer to Data Security Standard 1 in the DSPT Assertion 1.7 Data Quality (Evidence codes 1.7.2, 1.7.3, 1.7.4) for clinical coding audit assertions and evidence requirements.

Clinical coders must refer to Data Security Standard 3 in the DSPT Assertion 3 Training (Evidence code 3.4.3) for clinical coding training, i.e. Specialist Training, assertions and evidence requirements.

Guidance is now available within our Resource Library on the Data Security Standard 3 Training and Data Security Standard 1 Data Quality for Acute and Mental Health Trusts.

For an Organisation to be Satisfactory they must complete all of the mandatory evidence items in their toolkit. Evidence items 1.7.2, 1.7.3 and 1.7.4 (covering clinical coding audit) and 3.4.3 (covering clinical coding training) are mandatory items.