The Electronic Data Interchange (EDI) codes, required for submission of claim to the Korean national insurance system, represent most of approved drug, medical services, and medical devices in South Korea. Despite of its widespread use, the EDI vocabulary has never been regarded or examined as standard medical vocabulary. Here, we audit the EDI vocabulary as a controlled vocabulary. Furthermore, we incorporate the EDI vocabulary into Observational Medical Outcomes and Partnership (OMOP) vocabulary to enhance consistency and maintenance. The proposed process consisted of three steps: Enhancing Maintenance of Vocabulary, Classification of domains and Building hierarchy and Translation. A total of 313,457 concepts were uploaded from the EDI to the OMOP vocabulary. We made an R package public, which automates overall process. The EDI as OMOP vocabulary has improved in quality compared to the current EDI vocabulary.