FHIR Extensions Pack
5.3.0-ballot-tc1 - (September 2025 Ballot) International flag

FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.3.0-ballot-tc1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

ValueSet: Common UCUM Codes for Time Duration

Official URL: http://hl7.org/fhir/ValueSet/time-duration-units Version: 5.3.0-ballot-tc1
Standards status: Trial-use Maturity Level: 1 Computable Name: CommonUCUMCodesForTimeDuration

Copyright/Legal: The UCUM codes, UCUM table (regardless of format), and UCUM Specification are copyright © 1999-2009, Regenstrief Institute, Inc. and the Unified Codes for Units of Measures (UCUM) Organization. All rights reserved.

This value set includes all common UCUM codes used for Time Duration Units - 'a' (years), 'mo' (months), 'd' (days), 'h' (hours), 'min' (minutes), 's' (seconds), and 'ms' (milliseconds). NOTE: This value set is the same as the duration units value set, except that it does not include weeks, because weeks are not a valid precision for a datetime, time, or instant value.

References

Changes since version 5.2.0:

  • New Content

    • Logical Definition (CLD)

    • Include these codes as defined in http://unitsofmeasure.org
      CodeDisplay
      msmilliseconds
      sseconds
      minminutes
      hhours
      ddays
      momonths
      ayears

     

    Expansion

    Expansion from tx.fhir.org based on codesystem UCUM version2.2

    This value set contains 7 concepts

    CodeSystemDisplay (en-US)
      mshttp://unitsofmeasure.orgms
      shttp://unitsofmeasure.orgs
      minhttp://unitsofmeasure.orgmin
      hhttp://unitsofmeasure.orgh
      dhttp://unitsofmeasure.orgd
      mohttp://unitsofmeasure.orgmo
      ahttp://unitsofmeasure.orga

    Explanation of the columns that may appear on this page:

    Level A few code lists that FHIR defines are hierarchical - each code is assigned a level. In this scheme, some codes are under other codes, and imply that the code they are under also applies
    System The source of the definition of the code (when the value set draws in codes defined elsewhere)
    Code The code (used as the code in the resource instance)
    Display The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application
    Definition An explanation of the meaning of the concept
    Comments Additional notes about how to use the code