...

The Mapping tools were created to assist in the use case where you need to merge one or more sets of ontology terms into another.  Typical use cases are such as that found in federated query systems, e.g. SHRINE, where the ontology to use is dictated to you by another party and you have terms that do not align readily to the dictated ontology. For example the ontology might specify medication terms as RxNorm and your local ontology uses NDC or you may have extensive local terms and codes that have to be aligned.  Image Removed                                     

Image Added        
Merging medications into an RxNorm-based tree                                                                                      tree                                                                            Merging local diagnoses into an ICD-9-based tree