This data is coming from outpatient prescription database. Physician enter prescription, and system picks up a NDC associated with the medication description/code. Having the same description that OMOP has gives us confident to use the NDC for mapping.
The problem is “Maps to” RxNorm description doesn’t match with “Mapped from” NDC description.
Do you need MIN and MAX event dates for validation purpose? Although I can provide the MIN and MAX event dates associated with these codes/descriptions, this data is not dispensing records. Each description tight with one NDC. Thus, I am not sure you should use the data to determine valid starts date and end dates.
Please let me know if you still need the dates data.