# Special Concept

<mark style="color:$danger;">**This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.**</mark>

<table><thead><tr><th width="162.22918701171875">Definition</th><th width="579.2318115234375">Examples</th></tr></thead><tbody><tr><td><ul><li>Inactive concept</li><li>Navigational concept</li></ul></td><td><ul><li>363664003 | Erroneous concept (inactive concept) |</li><li>394899003 | Oral administration of treatment (navigational concept) |</li></ul></td></tr></tbody></table>

## Inactive concepts

*Inactive concepts* are no longer active in the terminology. When the first release format (RF1) was used, inactivated content was moved into this hierarchy. However, this approach is no longer used in the current release format (RF2).

## Navigational concepts

The concepts in navigational hierarchies are used for structured data entry and support the location of concepts in hierarchies. They can order data by priority or another convention (e.g. *cranial nerve order* or *topics related to diabetes*). Navigational concepts exist only to support navigation.

{% hint style="danger" %}
**NO LONGER SUPPORTED IN SNOMED CT CORE**
{% endhint %}

Navigational concepts:

* Are not suitable for recording or aggregating information
* Are direct subtypes of the concept 363743006 | Navigational concept (navigational concept) |
* Have no other supertype or subtype relationships
* Are linked to other concepts only by navigational links

For more information on navigational concepts, [click here](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/grouper-concept).

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