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Frequency-Based Prioritization of ICD-10-CA/CCI to OMOP Mapping in a Canadian Hospital Data Warehouse: Coverage and
Matisse Decilap1,2, Anya Okhmatovskaia1, Jean-Paul R Soucy3
1McGill Clinical & Health Informatics, Department of Epidemiology and Biostatistics, McGill University.
Abstract:
The adoption of the OMOP Common Data Model (CDM) for the secondary use of health data in Canada requires rigorous mapping of local terminologies such as ICD-10-CA and CCI to standard concepts. This study evaluates the coverage of these codes within the McGill University Health Centre (MUHC) in 2024 and analyzes the performance of Usagi in facilitating the mapping process. Our results show that mapping only 481 CCI codes (2.8%) and 1,015 specific ICD-10-CA codes (6.5%) achieves 80% coverage of hospital procedures and 99.1% of diagnoses, respectively. Usagi scores, significantly higher with long labels (p < 0.001), remain relatively low for automatic adoption, highlighting the need for expert validation. A prioritized and collaborative approach is essential to optimize resources and ensure the interoperability of Canadian data within OMOP.
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