Semantic mappings and locality of nursing diagnostic concepts in UMLS

► We identified quality issues for UMLS through cross-mapping and locality of nursing diagnoses. ► The UMLS mappings of CCC and NANDA-I concepts to SNOMED were highly concordant to expert mappings. ► The level of concordance in mappings of ICNP to SNOMED, CCC and NANDA-I in UMLS was relatively low. ► The semantic locality of ICNP concepts in UMLS could be further improved.