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When a new version of SNOMED CT is released this may include changes to the content of the terminology. Components may have been added, inactivated or changed as described in  11.4 VersioningAs part of the terminology maintenance process, it may be appropriate to evaluate both the  Representing Reasons for Component Inactivation  and to determine appropriate alternatives.

The International Edition of SNOMED CT distributes a set of reference sets that record the reason that each inactive component was inactivated. These are referred to as "historical association" reference sets (see  4.2.3 Historical Association Reference Sets for more details). There is one historical association reference set for each type of historical association as shown in the table below.

Table 3.2.6.3.2-2: Association reference set types in the International Release of SNOMED CT

Association reference set

Descriptions

Applies to a concept that is ambiguous. The targetComponent is an active concept that represents one of the possible meanings of the inactive concept . Multiple rows are used to refer to each of the possible meanings of the ambiguous concept.

Applies to a component that has been moved to (or are pending a move to) another namespace. The targetComponent identifies the target namespace (not the new component ).

Applies to a component that has been moved to this namespace from another namespace. The targetComponent identifies the original component Identifier in its previous namespace.

Applies to an erroneous, obsolete and other inactive component for which there is a single active replacement. The targetComponent identifies the active component that replaces this component.

Applies to a component that is a duplicate. The targetComponent identifies the active component that this component duplicates.

Links an inactive classification concept such as "not otherwise specified" or "otherwise specified" with the active concept that was formerly its most proximal supertype.

(not used currently)

Links an inactive classification concept derived from ICD-9 Chapter XVI "Symptoms signs and ill-defined conditions" with the most similar active concept.

Applies to an inactive description which is inappropriate to the concept  it is directly linked to but instead should refer to the concept referenced by the targetComponent.


The following table holds example entries for the  900000000000526001 |Replaced by|reference set. With this reference set is possible to automatically identify that the inactive concept 696005 |Chronobiologic disorder|should be replaced with the concept 387605007 |Abnormal chronobiologic state|. This type of reference set is particularly useful for ensuring consistent use of SNOMED CT over time. The reference set mechanism here provides an easy and standardized way of managing changes to coding or documentation practice over time.

Table 3.2.6.3.2-2: Sample content from 900000000000526001 | REPLACED BY association reference set |

referencedComponentIdreferencedComponentId_termtargetComponentIdtargetComponentId_term

100005

SNOMED RT Concept

138875005

SNOMED CT Concept

212002

Salmonella III arizonae 53:k:z

398450001

Salmonella IIIb 53:k:z

225005

Special care of patient with contagious disease

133895001

Care of patient with infectious disease

244003

Evans and Lloyd-Thomas syndrome

66659007

Normal variation in position

278009

Epidural injection of neurolytic substance, lumbar

17753007

Epidural injection of neurolytic solution, lumbar

558000

Other disorder of the neurohypophysis, NEC

72442006

Disorder of posterior pituitary

659001

Peptostreptococcus anaerobius

413524006

Anaerococcus tretradius

696005

Chronobiologic disorder

387605007

Abnormal chronobiologic state

700002

Salmonella III arizonae 50:z4,z23,z32:--

404619004

Salmonella IIIa 50:z4,z23,z32:-

822000

Salmonella arizonae 53:z4,z23:--

13998005

Salmonella IV 53:z4,z23:--

 

 

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