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The SNOMED CT Extensions Specification and Guide providing information about the way in which SNOMED CT Extensions are represented and related to the International Edition and to other extensions. It also provides guidance on development, distribution and use of extensions.

NOTE: Some aspects of the required guidance in this document are incomplete and under revision.

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Publication date: 2019-02-19
This is the date when this PDF file was generated from the online version of this document.

© Copyright 2019 International Health Terminology Standards Development Organisation, all rights reserved.

This document is a publication of International Health Terminology Standards Development Organisation, trading as SNOMED International.  SNOMED International owns and maintains SNOMED CT®.

Any modification of this document (including without limitation the removal or modification of this notice) is prohibited without the express written permission of SNOMED International. This document may be subject to updates. Always use the latest version of this document published by SNOMED International. This can be viewed online and downloaded by following the links on the front page or cover of this document.

SNOMED®, SNOMED CT® and IHTSDO® are registered trademarks of International Health Terminology Standards Development Organisation. SNOMED CT® licensing information is available at For more information about SNOMED International and SNOMED International Membership, please refer to or contact us at

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