Information and Resources

The NHS Classifications Browser is updated each time a new release of the ICD-10 or OPCS-4 classifications or the National Clinical Coding Standards Reference Books is released. Links from the classification codes are to NHS England clinical coding standards.

The World Health Organisation ICD-10 5th Edition Volumes 1-3 are included with permission from WHO for UK purposes only.

The errata for ICD-10 5th Edition hard copy books, as listed in ICD-10 and OPCS-4 Classifications Content Changes [2022], have been corrected in the NHS Classifications Browser

Reference books for National Clinical Coding Standards (NCCS) ICD-10 and OPCS-4 for the NHS users in England are updated automatically when new coding standards are published

Use the links below to access:

System suppliers can download ICD-10 and OPCS-4 datafiles for use in hospital systems from the Technology Reference Data Update Distribution platform: TRUD

Clinical Coding in Northern Ireland, Scotland and Wales

coders working in Northern Ireland, Scotland or Wales can access the relevant clinical coding standards using the links below:

Northern Ireland

Clinical Coding Sharing platform (only available to NI Clinical Coders)


Scottish Clinical Coding Standards


Welsh Clinical Coding Standards & Guidance