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The Observational Medical Outcomes Partnership (OMOP) Common Data Model (CDM) is a standardised framework for organising healthcare data. This study investigates the practicality of using the OMOP CDM to analyse data on neurology patients.An outpatient neurology cohort was defined as patients having attended at least one neurology outpatient appointment between 01 April 2022 and 31 March 2023 (n=23,862). All available data for this cohort was extracted between the dates 01 April 2021 to 31 March 2024. The cohort was then divided into 4 sub-cohorts according to the types of appointments attended: outpatient appointment(s) only (n=15,255); outpatient appointment(s) and inpatient stay(s) (n=2750); outpatient appointment(s) and emergency department visit(s) (n=1658); outpatient appointment(s), inpatient stay(s) and emergency department visit(s) (n=4199).We found that there was more data available for patients who had at least one inpatient stay or emergency department visit, than for those with only outpatient appointments. Notably, an average (median) of 0 conditions per patient were recorded for the outpatient only sub-cohort, compared to a median of 21 conditions for the sub-cohort with both outpatient appointments and inpatient stays. This disparity arises from the lack of outpatient diagnostic coding and impairs the advancement of research in this area.laura.white19@doctors.org.uk