3.2.6.3.2. Representing Historical Associations

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 Versioning. As 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.

Association reference set	Descriptions
900000000000523009 \| POSSIBLY EQUIVALENT TO association reference set\|	Applies to aconceptthat is ambiguous. The targetComponent is an activeconceptthat represents one of the possible meanings of the inactiveconcept. Multiple rows are used to refer to each of the possible meanings of the ambiguousconcept.
900000000000524003 \| MOVED TO association reference set\|	Applies to acomponentthat has been moved to (or are pending a move to) another namespace. The targetComponent identifies the target namespace (not the newcomponent).
900000000000525002 \| MOVED FROM association reference set\|	Applies to acomponentthat has been moved to this namespace from another namespace. The targetComponent identifies the originalcomponent Identifierin its previous namespace.
900000000000526001 \| REPLACED BY association reference set\|	Applies to an erroneous, obsolete and otherinactive componentfor which there is a single active replacement. The targetComponent identifies the activecomponentthat replaces thiscomponent.
900000000000527005 \| SAME AS association reference set\|	Applies to acomponentthat is a duplicate. The targetComponent identifies the activecomponentthat thiscomponentduplicates.
900000000000528000 \| WAS A association reference set\|	Links an inactive classificationconceptsuch as "not otherwise specified" or "otherwise specified" with the activeconceptthat was formerly its most proximal supertype.
900000000000529008 \| SIMILAR TO association reference set\|	(not used currently)
900000000000530003 \| ALTERNATIVE association reference set\|	Links an inactive classificationconceptderived from ICD-9 Chapter XVI "Symptoms signs and ill-defined conditions" with the most similar activeconcept.
900000000000531004 \| REFERS TO concept association reference set\|	Applies to an inactivedescriptionwhich is inappropriate to theconcept it is directly linked to but instead should refer to theconceptreferenced 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.

referencedComponentId	referencedComponentId_term	targetComponentId	targetComponentId_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:--

Search

Page tree