There are examples of integrating data using ICD9 or RxNorm. For example STRIDE group uses RxNorm to integrate data repositories from multiple institutions.
I have a question to the forum:
Clinical LOINC Document Ontology can also be used in a similar way to help integrate. Can you post your use of the document ontology if you use it as a reference terminology ?
For some NLP projects, I can, for example imagine comparing if particular NLP processing methodology works the same way on