> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/reference-sets/reference-set-types/map-type-reference-sets/extended-map-type-reference-sets.md).

# Extended Map type Reference Sets

Extended Map type Reference Sets are very similar to Complex Map type Reference Sets, but also allow specifying map categories for an associated Reference Set member.

To create an Extended Map type Reference Set, right-click on the corresponding Reference Set type in the Reference Set View and select ![](/files/yon2rptrh65eC7XY78k0)*New extended map type reference set...* from the Context Menu.

{% hint style="success" %}
Only SNOMED CT Concept to ICD-10 Class mappings are possible.
{% endhint %}

Members can be added the usual way. Correlation and Map category fields are mandatory to fill.

Mandatory properties to be specified in the New Member Wizard:

| Property                 | Description                                                                                                       |
| ------------------------ | ----------------------------------------------------------------------------------------------------------------- |
| **Referenced component** | The SNOMED CT component that is mapped to the other terminology or Code System                                    |
| **Map target**           | The target code in the target terminology, classification, or Code System                                         |
| **Map group**            | A value grouping a set of Complex Map records from which one may be selected as a target code                     |
| **Map priority**         | The order in which Complex Map records should be checked within a Map Group                                       |
| **Correlation**          | The correlation between the SNOMED CT component and the target code                                               |
| **Map category**         | The SNOMED CT component in the metadata hierarchy which represents the Map Category for the associated map member |
| **Module**               | The SNOMED CT module that contains this Reference Set member (primary module by default)                          |

Other properties:

| Property       | Description                                                                                                                                                     |
| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Map rule**   | A machine-readable rule, (evaluating to either `true` or `false` at run-time) that indicates whether this map record should be selected within its Map Group    |
| **Map advice** | Human-readable advice, that may be used to give an end-user advice on selection of the appropriate target code from the alternatives presented within the group |

In case of ICD-10, the individual category values are subtypes of `447634004|ICD-10 Map category value|`. 

{% hint style="info" %}
For further information about Extended Map type Reference Set, refer to the SNOMED International Technical Implementation Guide's Complex and Extended map Reference Sets.
{% endhint %}

Some of the properties can be modified afterward from the Extended Map type Reference Set Editor. In-cell editing is allowed in the specified member fields such as *groupNumber, mapPriority, mapAdvice, mapRule, correlation, mapCategory* columns when authoring Extended Map type Reference Sets.


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