Fig. 1From: A numerical similarity approach for using retired Current Procedural Terminology (CPT) codes for electronic phenotyping in the Scalable Collaborative Infrastructure for a Learning Health System (SCILHS)The i2b2 mapping tool, showing our algorithms’ suggested placements for retired CPT codes. This freely-available tool can be used to manually map, visually validate, and generate a merged i2b2 ontology file. In this study, we used this tool for some visual validation and to generate the ontology file. Our automated method created the mappingsBack to article page