Delen: Home

Delen: Home

Welcome to Delen - the information sharing and collaboration platform for users of our Terminology and Classifications products.

Here you can access up-to-date information, useful resources, education and training materials and technical support relating to our products, to help you in your role.

We hope you find the site useful, but if there's anything we can do to improve, please let us know by contacting our helpdesk at

Query Resolution Database

Our Query Resolution Database contains the resolutions we've provided to classifications and associated clinical coding queries received by our Product Support helpdesk in NHS England. 

Read Codes to SNOMED CT Maps

Our databases hold the current maps for:

SNOMED CT to Classifications Maps

SNOMED CT to Classifications Maps are a link from SNOMED CT to OPCS-4 and ICD-10, compiled to reflect the national clinical coding standards and aid the application of the three dimensions of coding accuracy. 


We run consultations relating to the development and delivery of our products and services. Our Consultations provide useful information to help us make better decisions and better understand the priorities of our stakeholders. 

Publications and Resources

Browse our list of popular publications  or search our Resource Library which contains a collection of useful Terminology and Classifications materials. 

Auditor and Trainer Programmes

View our list of programmes available to Approved Clinical Coding Auditors and Trainers, as well as useful documents to help you in your role.

Member Workspaces

We host a number of restricted member workspaces, designed to meet the specific information needs of particular users e.g. clinical coding managers or organisations undertaking SNOMED CT implementation. 

Advice and Support

Our support and advice provides information on what to do if you need help or have a query.