Parkinsonism /tremor 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
- used terms in Clegg 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
- excluded codes indicating test done but no result reported 
- included overdose/accidental poisoning with parkinson drugs codes as implies access to drugs
- included tremors due to any cause, as per Clegg
- 