Absence of Appendix

Coding system
CTV3 (Read V3)
Coding system release
Codelist ID
Version Tag
Version ID



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


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.


Signed off by

  • Will Hulme, (Sept. 24, 2020)
  • Amir Mehrkar, (Sept. 24, 2020)
  • Caroline Morton, (Sept. 24, 2020)

Codelists are developed by a broad community of users for individual study purposes, which may or may not meet the needs of other studies. They should not be thought of as universal definitions of a particular condition.

We don't offer any guarantees about what they do or don't identify. Users should carefully check that any codelist meets their needs, and seek clinical input where appropriate.

CTV3Code CTV3PreferredTermDesc
X20Wz Appendicectomy
Xa9U0 Appendicectomy NEC
XaBAV Appendicectomy and drainage
7701z Appendicectomy: [Other NOS] or [NEC]
7701. Appendicectomy: [other] or [non emergency]
Xa7Tx Appendix absent
PB201 Congenital absence of appendix
7700. Emergency appendicectomy
77000 Emergency excision of abnormal appendix and drainage however further qualified
77003 Emergency appendicectomy NEC
77001 Emergency excision of abnormal appendix NEC
7700y Other specified emergency excision of appendix
7700z Emergency excision of appendix NOS
77002 Emergency excision of normal appendix
77014 Endoscopic appendicectomy NEC
77012 Incidental appendicectomy
77010 Interval appendicectomy
77013 Planned delayed appendicectomy NEC
77011 Prophylactic appendicectomy NEC
7701y Other specified other excision of appendix
X20X1 Inversion appendicectomy
Xa9w5 Laparoscopic appendicectomy
77004 Laparoscopic emergency appendicectomy
XaBAT Laparoscopic interval appendicectomy
X20X0 Non-emergency appendicectomy
XE0D7 Other excision of appendix
XE0D8 Other excision of appendix NOS

Codes not in the full codelist are in faint grey.