If I am standardising an ICD10CN code to OMOP (SNOMED), where there is a one-to-many relationship, for example
S21.331 (ICD10CN code) maps to SNOMED 210410008,10850301000119105,735765006
What should I expect after our automated ETL, for example should the patient have (i) one OMOP SNOMED code or the patient has (ii) multiple OMOP SNOMED codes.
If (ii) multiple, does this create artefacts in the dataset where it looks like a patient now has multiple conditions? On the analytics side how do you distinguish between multiple conditions as an artefact of the etl (i.e. from a single diagnosis event) to real cases of multiple diagnoses