Extensions Practical Guide

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changes.mady.by.user David Markwell

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OrderPart
RulesExample
1Item identifier
  • 1 to 8 digits in length
  • Allocated by the extension producer
  • Must be unique for the given namespace identifier and component type
528
2namespace identifier
  • 7 digits in length
  • Allocated by SNOMED International to the extension producer
  • Not used in components created by SNOMED International
1000124
3partition identifier
  • 2 digits in length
  • The following partition identifiers are used in an extension:
    • 10 - extension concepts
    • 11 - extension descriptions
    • 12 - extension relationships
10
4check digit
  • 1 digit in length
  • Computed from other digits in the SCTID using the Verhoeff check algorithm
3

effectiveTime

The second attribute of every extension component is 'effectiveTime'. This attribute specifies the date on which the specific version of the component was released, using the ISO 8601 YYYYMMDD format. When a component is added or modified in an extension, the effectiveTime of the component version will match the version date of the release.

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