As long as I know, only OMOP concept_id can be stored in SOURCE_CONCEPT_ID. Technically, we should map the KCD6 to OMOP concept id for ICD 10 then, store the OMOP concept id for ICD10 in the database. Capturing source_concept_id is possible only for the condition in Korea.
As you might know, most health care services are covered by the national insurance in Korea. The HIRA (Health Insurance Review and Assessment Service) reviews whole claims and and National Health Insurance Service (NHIS) pays back to the hospital as the insurer. See the details here.
99% of claims are submitted electronically (details). Conditions are recorded in KCD-6, which is very similar to ICD-10 (The codes for oriental medicine are added). For drug, procedure, device, and measurement, Korea has unique national medical code system, EDI (Electronic Data Interchange) like READ in England.
So, Korea does have the national standardized code system, it would be great if this can be intergrated into OMOP CODE as the source. Then we can capture source_concept_id for other tables.