[
  {
    "phenotype_id": "PH3256",
    "phenotype_version_id": 8241,
    "name": "Absence of Appendix",
    "definition": "This codelist was taken from [OpenCodelists](https://www.opencodelists.org/), created by [OpenSAFELY](https://www.opensafely.org/). We recommend viewing this Phenotype on the OpenCodelist website to view the most recent version.\n\n\nCodes that indicate an absence of an appendix, either as a clinical finding or due to appendicectomy\n\n\n© University of Oxford for the Bennett Institute for Applied Data Science 2025\\. This work may be copied freely for non\\-commercial research and study.\n\n",
    "implementation": null,
    "publications": null,
    "validation": null,
    "citation_requirements": null,
    "created": "2026-01-26T23:07:43.481043Z",
    "author": "OpenSAFELY",
    "collections": [
      {
        "name": "OpenCodelist",
        "value": 31
      },
      {
        "name": "Phenotype Library",
        "value": 18
      }
    ],
    "tags": null,
    "organisation": {
      "id": 1,
      "slug": "opensafely",
      "name": "OpenSAFELY"
    },
    "world_access": 1,
    "updated": "2026-01-26T23:07:44.669297Z",
    "references": [
      {
        "url": "https://github.com/opensafely/vacc-trial-monitoring-research/issues/6",
        "title": "GitHub issue"
      }
    ],
    "signed_off": [],
    "methodology": "These codes were mapped first in SNOMED using the opencodelist builder. The search terms used were:\n\n\n- Appendicectomy\n- Appendectomy\n- Appendix\n\n\nThough a broad search term, \"appendix\" was included to capture codes such as \"congenital absence\" or \"excision of appendix\". 24 codes were identified in SNOMED.\n\n\nThe codes were discussed by 2 practicing GPs and 1 epidemiologist. A summary of the discussion is available on the github issue below.\n\n\nThese 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.\n\n",
    "coding_system": [
      {
        "name": "Read codes v3",
        "value": 6
      }
    ],
    "open_codelist_id": "opensafely/absence-of-appendix",
    "source_reference": "https://www.opencodelists.org/codelist/opensafely/absence-of-appendix/2020-09-28",
    "concept_information": [
      {
        "concept_id": 8418,
        "concept_version_id": 15903,
        "concept_name": "opensafely/absence-of-appendix/2020-09-28",
        "coding_system": {
          "id": 6,
          "name": "Read codes v3",
          "description": "Read codes v3"
        },
        "phenotype_id": "PH3256",
        "phenotype_version_id": 8241,
        "phenotype_name": "Absence of Appendix",
        "code_attribute_header": [],
        "codes": [
          {
            "code": "7700.",
            "description": "Emergency appendicectomy",
            "attributes": null
          },
          {
            "code": "77000",
            "description": "Emergency excision of abnormal appendix and drainage however further qualified",
            "attributes": null
          },
          {
            "code": "77001",
            "description": "Emergency excision of abnormal appendix NEC",
            "attributes": null
          },
          {
            "code": "77002",
            "description": "Emergency excision of normal appendix",
            "attributes": null
          },
          {
            "code": "77003",
            "description": "Emergency appendicectomy NEC",
            "attributes": null
          },
          {
            "code": "77004",
            "description": "Laparoscopic emergency appendicectomy",
            "attributes": null
          },
          {
            "code": "7700y",
            "description": "Other specified emergency excision of appendix",
            "attributes": null
          },
          {
            "code": "7700z",
            "description": "Emergency excision of appendix NOS",
            "attributes": null
          },
          {
            "code": "7701.",
            "description": "Appendicectomy: [other] or [non emergency]",
            "attributes": null
          },
          {
            "code": "77010",
            "description": "Interval appendicectomy",
            "attributes": null
          },
          {
            "code": "77011",
            "description": "Prophylactic appendicectomy NEC",
            "attributes": null
          },
          {
            "code": "77012",
            "description": "Incidental appendicectomy",
            "attributes": null
          },
          {
            "code": "77013",
            "description": "Planned delayed appendicectomy NEC",
            "attributes": null
          },
          {
            "code": "77014",
            "description": "Endoscopic appendicectomy NEC",
            "attributes": null
          },
          {
            "code": "7701y",
            "description": "Other specified other excision of appendix",
            "attributes": null
          },
          {
            "code": "7701z",
            "description": "Appendicectomy: [Other NOS] or [NEC]",
            "attributes": null
          },
          {
            "code": "PB201",
            "description": "Congenital absence of appendix",
            "attributes": null
          },
          {
            "code": "X20Wz",
            "description": "Appendicectomy",
            "attributes": null
          },
          {
            "code": "X20X0",
            "description": "Non-emergency appendicectomy",
            "attributes": null
          },
          {
            "code": "X20X1",
            "description": "Inversion appendicectomy",
            "attributes": null
          },
          {
            "code": "Xa7Tx",
            "description": "Appendix absent",
            "attributes": null
          },
          {
            "code": "Xa9U0",
            "description": "Appendicectomy NEC",
            "attributes": null
          },
          {
            "code": "Xa9w5",
            "description": "Laparoscopic appendicectomy",
            "attributes": null
          },
          {
            "code": "XaBAT",
            "description": "Laparoscopic interval appendicectomy",
            "attributes": null
          },
          {
            "code": "XaBAV",
            "description": "Appendicectomy and drainage",
            "attributes": null
          },
          {
            "code": "XE0D7",
            "description": "Other excision of appendix",
            "attributes": null
          },
          {
            "code": "XE0D8",
            "description": "Other excision of appendix NOS",
            "attributes": null
          }
        ]
      }
    ],
    "coding_system_release": "",
    "open_codelist_version_id": "5af6cb1d",
    "open_codelist_version_tag": "2020-09-28",
    "status": 1,
    "doi": "https://doi.org/10.48533/x7vj-gn96",
    "is_deleted": false,
    "publish_status": 2,
    "owner": "ieuan.scanlon",
    "template": {
      "id": 3,
      "name": "OpenCodelists Phenotype",
      "description": "OpenSafely's OpenCodelist Phenotype, visit https://www.opencodelists.org/ to learn more",
      "version_id": 1
    },
    "versions": [
      {
        "version_id": 8241,
        "version_name": "Absence of Appendix",
        "version_date": "2026-01-26T23:07:44.680007Z",
        "is_published": true,
        "is_latest": true
      },
      {
        "version_id": 8240,
        "version_name": "Absence of Appendix",
        "version_date": "2026-01-26T23:07:43.493562Z",
        "is_published": true,
        "is_latest": false
      }
    ]
  }
]