Purpose

A

Concept
t 447250001|Complex map type reference set| ShowFormat inline

enables representation of maps where each

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PreSpace false t SNOMED CT concept

may map to one or more codes in a

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. The type of

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supports the general set of mapping data required to enable a

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to be selected at run-time from a number of alternate codes. It supports

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selection by accommodating the inclusion of machine readable rules and/or human readable advice. An

Concept
t 609331003|Extended map type reference set| ShowFormat inline

adds an additional field to allow categorization of maps.

Data structure

A Complex map reference set is an Integer - Integer -

Specref
RefType (data type) t String

-

Specref
RefType (data type) t String

-

Specref
RefType (data type) t String

-

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PreSpace false t Component

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. The pattern is currently used for the map to ICD-9-CM. Its structure is as shown in the following table, with one exception - the table includes an additional field (

Specref
RefType (field) t mapCategoryId

) which is not used for this type of map.

An Extended map reference set follows the same pattern but adds one additional column. It is an Integer - Integer -

Specref
RefType (data type) t String

-

Specref
RefType (data type) t String

-

Specref
RefType (data type) t String

-

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-

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and this pattern is currently used for maps to ICD-10. Its structure is shown in the following table.

Caption label
CapId complex-and-extended-map-reference-sets-data-structures CapType Table
Complex and Extended map reference sets - Data structures

Refset spec table
Size fs7 RefsetType Complex and Extended Map Reference Set

Map Group, Priority and Rules

Values for

Specref
RefType (field) t mapGroup

are allocated on a sequential basis (for each

Specref
RefType (field) t refsetId

and

Specref
RefType (field) t referencedComponentId

combination) during authoring starting at 1. However, distributed

Specref
RefType (field) t mapGroup

are not necessarily sequential, as some

Specref
RefType (field) t mapGroup

may be created and removed during a mapping process between releases. For maps where each

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only maps to at most one of a group of alternate

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, the mapGroup field are usually be set to '1'.

Values for

Specref
RefType (field) t mapPriority

will be allocated on a sequential basis (within each map group) starting from '1'. For maps that do not require run - time alternatives, the

Specref
RefType (field) t mapPriority

field is set to '1'.

The

Specref
RefType (field) t mapRule

and

Specref
RefType (field) t mapAdvice

fields enable run-time selection (within vendor's software) from a number of alternative map records within a

Specref
RefType (field) t mapGroup

. Where there are no alternatives maps these columns of the release files will be empty (zero length string). Where alternative maps exist one or both of columns will be populated where relevant information is available.

Where both fields are populated, and a vendor's system is capable of processing a machine readable rule, this should take priority over the human readable advice. Where neither field is populated, a vendor's system should allow the end-user to select the appropriate

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from the alternates.

For more details on this topic in relation to the ICD-10 maps released as part of the SNOMED CT International Edition please see the  ICD-10 Mapping Technical Guide

Mapping Rule Specifications

The specific grammar and content of the rules for resolving complex mapping cases depends on the nature of the 

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system or classification. In general, each map is accompanied by a rule which is tested against other data and can be evaluated to return one of the following values:

• True - in which case the map target applies;
• False - in which case the map target does not apply;
• Indeterminate - in cases where there is insufficient accessible data to determine whether the map target applies. In this case manual resolution of the map using the map advice provided will be required.

The mapping rules assume access to a number of variables, that can be bound to appropriate attributes in the vendor's system information model. These include the age and gender of the patient and information about coexisting situations (e.g. records of other disorders, procedures or events in the same patient record).

Detailed definitions of the mapping rules used forms part of individual specifications for maps to particular 

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systems and classifications. This will initially be provided separately and will accompany the release of the relevant mapping files. For example, the set of rules used for mapping to 

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are included in the  ICD-10 Mapping Technical Guide.

Metadata

The following metadata supports this

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:

Caption label
CapId complex-map-references-sets-in-the-metadata-hierarchy CapType Table
Complex Map References Sets in the Metadata Hierarchy

Scg expression
Border ridge
900000000000454005 |Foundation metadata concept| 900000000000455006 |Reference set| 447250001 |Complex map type reference set| 609331003 |Extended map type reference set|

Excerpt Include
REUSE:Notes on Reference Set Example Tables REUSE:Notes on Reference Set Example Tables nopanel true

Descriptor Templates

The tables below examples of the descriptors for specific

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that follow the

Concept
t 447250001|Complex map type reference set| ShowFormat inline

and

Concept
t 609331003|Extended map type reference set| ShowFormat inline

patterns.

Caption label
CapId refset-descriptor-rows-for-a-complex-map-reference-set- CapType Table
Refset Descriptor Rows for a Complex Map Reference Set

Caption label
CapId refset-descriptor-rows-for-an-extended-map-reference-set- CapType Table
Refset Descriptor Rows for an Extended Map Reference Set

Example Data

Caption label
CapId sample-content-from-an-extended-map-reference-set CapType Table
Sample Content from an Extended Map Reference Set

Related Links

• ICD-10 Mapping Technical Guide