Absence of Appendix

PH3256 / 8241

OpenSAFELY

Jan 26, 2026

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OpenCodelists Phenotype

  1. Overview

    Codelist ID
    opensafely/absence-of-appendix
    Version ID
    5af6cb1d
    Version Tag
    2020-09-28
    Coding System
    Read codes v3
    Collections
    OpenCodelistPhenotype Library
    Tags
    No data

  2. Definition

    This codelist was taken from OpenCodelists, created by OpenSAFELY. We recommend viewing this Phenotype on the OpenCodelist website to view the most recent version.

    Codes that indicate an absence of an appendix, either as a clinical finding or due to appendicectomy

    © University of Oxford for the Bennett Institute for Applied Data Science 2025. This work may be copied freely for non-commercial research and study.

  3. Methodology

    These codes were mapped first in SNOMED using the opencodelist builder. The search terms used were:

    • Appendicectomy
    • Appendectomy
    • Appendix

    Though a broad search term, "appendix" was included to capture codes such as "congenital absence" or "excision of appendix". 24 codes were identified in SNOMED.

    The codes were discussed by 2 practicing GPs and 1 epidemiologist. A summary of the discussion is available on the github issue below.

    These codes were mapped to CTV3 which resulted in 23 codes initially. One extinct code was removed, and a further 5 "unasssured" codes were added, leaving 27 codes in total.

  4. References

    Source Reference

    https://www.opencodelists.org/codelist/opensafely/absence-of-appendix/2020-09-28

    References

  5. Clinical Codelist

  6. API

    To Export Phenotype Details:

    FormatAPI
    JSON site_root/api/v1/phenotypes/PH3256/version/8241/detail/?format=json
    R Package

    # Download here

    library(ConceptLibraryClient)


    # Connect to API

    client = ConceptLibraryClient::Connection$new(public=TRUE)


    # Get details of Phenotype

    phenotype_details = client$phenotypes$get_detail(
     'PH3256',
     version_id=8241
    )

    Py Package

    # Download here

    from pyconceptlibraryclient import Client


    # Connect to API

    client = Client(public=True)


    # Get details of Phenotype

    phenotype_detail = client.phenotypes.get_detail(
     'PH3256',
     version_id=8241
    )

    To Export Phenotype Code List:

    FormatAPI
    JSON site_root/api/v1/phenotypes/PH3256/version/8241/export/codes/?format=json
    R Package

    # Download here

    library(ConceptLibraryClient)


    # Connect to API

    client = ConceptLibraryClient::Connection$new(public=TRUE)


    # Get codelist of Phenotype

    phenotype_codelist = client$phenotypes$get_codelist(
     'PH3256',
     version_id=8241
    )

    Py Package

    # Download here

    from pyconceptlibraryclient import Client


    # Connect to API

    client = Client(public=True)


    # Get codelist of Phenotype

    phenotype_codelist = client.phenotypes.get_codelist(
     'PH3256',
     version_id=8241
    )

  7. Version History

    Version IDNameOwnerPublish date
    Absence of Appendix ieuan.scanlon2026-01-26 23:07
    8240 Absence of Appendix ieuan.scanlon2026-01-26 23:07