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The  |Map correlation and origin type reference set| is used to meet the requirements for representation of maps between codes in another code system   (other-codes) and a   SNOMED CT concept where the following requirements apply.

  1. A requirement to indicate the degree of correlation between the SNOMED CT concept and the  other-codes.
  2. A requirement to indicate whether a concept or code was added to either code system as a result of the mapping process and, in this case, to indicate in which code system the concept or code originated.
  3. A requirement to represent the SNOMED CT attribute to which the   other-code should be applied in order to capture the full specificity of the value represented by the   other-code.
  4. No requirements for mapping rules or advice to be included with each map.

Data Structure

Table 5.2.14-1: Map Correlation and Origin Reference Set - Data Structure


Data type


Part of Primary Key


A 128 bit unsigned Integer, uniquely identifying this reference set member.

Different versions of a reference set member share the same id but have different effectiveTime. This allows a reference set member to be modified or made inactive (i.e. removed from the active set) at a specified time.

NOYES (Full /Snapshot)

The inclusive date or time at which this version of the identified reference set member became the current version.

Note: In distribution files the effectiveTime should follow the short ISO date format (YYYYMMDD) and should not include the hours, minutes, seconds or timezone indicator.

The current version of this reference set member at time T is the version with the most recent effectiveTime prior to or equal to time T .


YES (Full)

Optional (Snapshot) 

The state of the identified reference set member as at the specified effectiveTime .

If active = 1 (true) the reference set member is part of the current version of the set, if active = 0 (false) the reference set member is not part of the current version of the set.


Identifies the SNOMED CT module that contains this reference set member as at the specified effectiveTime .

The value must be a subtype of 900000000000443000 |Module (core metadata concept)|within the metadata hierarchy.


Identifies the reference set to which this reference set member belongs.


A reference to the SNOMED CT component to be included in the reference set.

The SNOMED CT concept that is associated with the code in the other terminology or code system.



The other-code to/from which the concept is mapped.


A reference to the SNOMED CT concept representing the attribute to which the referencedComponentId (other-code) applies. In some cases, other-codes may be overloaded with a meaning that combines the meaning of a specific attribute with a value applied to it in the SNOMED CT concept model1 , in these cases accurate mapping needs to specify both aspects of the meaning. The attributeId provides effective disambiguation in these cases. Values of attributeId are restricted to subtypes of |Concept model attribute|.


Indication of whether the concept was initially in one of the terminologies (SNOMED CT or other-codes) and added to the other as part of mapping or was in both terminologies at the outset. Values are subtypes of   705116007 |Original code system source for linked content value|.


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