The perioperative nursing data set (PNDS) is a structured vocabulary developed by AORN to help document perioperative nursing practices. The PNDS has been mapped to the Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT) reference terminology model to support the electronic exchange of nursing data. This study validates the concept mapping between the PNDS and SNOMED CT, supporting an equivalent meaning of concepts between the two terminology systems.