Absence of Appendix



Coding system
CTV3 (Read V3) with TPP extensions
Project
OpenSAFELY
Codelist ID
opensafely/absence-of-appendix
Version
2020-09-28

Description

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

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.

References

Signed off by

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

This definition has been computed by taking the manually created full codelist and converting it to a list of rules that define the codelist.

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.