<p>Mason, Kayleigh J; Jordan, Kelvin P; Welsh, Victoria K; Bailey, James; Bajpai, Ram; Clarson, Lorna E; Faux-Nightingale, Alice; Hadley-Barrows, Tina; Haines, John K; Harrison, Rosie; Helliwell, Toby; Hider, Samantha L; Jinks, Clare; Knight, Natalie; Mallen, Christian D; Burton, Claire. (2025) Building an evidence base for the use of ADvice and GuidancE Referrals at the primary-secondary care interface (BADGER) a multistage mixed-methods study: Code Lists for WP2. SNOMED Clinical terminology, Clinical Practice Record Datalink (CPRD) AURUM dataset code lists and International Classification of Diseases, 10th Revision (ICD-10) code lists used in the BADGER Study (2026): The aim of this part of the study is to determine whether time to diagnosis, attended outpatient appointment or definitive treatment, or healthcare utilisation differs between those recorded A&amp;G request before diagnosis compared to those with elective referral only for three tracer conditions (inflammatory bowel disease; Parkinson's disease; systemic lupus erythematosus).</p>