Peptic ulcer disease codelist creation

Author: Monica Iyer
Last updated: May 14, 2026
Data source: CPRD Aurum

Variable created as part of eFI2

1. Mapped the given eFI2 SNOMED codes to medcodes using March 2026 codebrowswer
2. Merged resulting codelist with GGL's previously-generated codelist from infections/mental health study (2025)
3. De-duplicated
4. New codes reviewed by CWG May 2026

The columns Otherinstructions, TimeConstraintyears, and AgeLimit refer to additional criteria based on eFI2.

GGL readme
Generated by GGL and reviewed by CWG
Used CPRD AURUM Medical Browser, Version March 2024


Notes on process: 
- started with Julian Matthewman Aurum "translation" of Clegg codelist
- merged in Teoh peptic ulcer codelist-https://datacompass.lshtm.ac.uk/id/eprint/3590/ (https://doi.org/10.17037/DATA.00003590)
- used terms in Clegg & Teoh codelist to search on "term" and identify additional codes 

Notes on inclusion/exclusion criteria: 
- included historic ("history of") codes as trying to capture frailty as a state rather than incidence of components
- excluded "family hisotry" codes
- dropped "*vulva*" codes that were included in Teoh codelist- not sure why they were included
