Trying to understand how to ETL ICD diagnosis codes into OMOP. Many have a domain_id that is not Condition, which I understand. However, what happens when the domain_id IS Condition, but its mappings to a "standard concept" are NOT Condition?
1) Add a row only in the domain of the standard concept mapping (e.g., Observation).
2) Add a row in both the domain of the standard concept mapping AND the domain of the source concept_id (e.g., Condition). Presumably then the concept_id in this row would be 0.
The latter acknowledges that the source data had a row in a domain even though no standard mapping exists, though the former is more compact. Which is correct?