The idea is that you can use these concepts to indicate the …_type_concept_id:
drug_type_concept_id in Drug_exposure table
http://www.ohdsi.org/web/wiki/doku.php?id=documentation:cdm:drug_exposure
or condition_type_concept_id in Condition occurrence table, and the same for the other tables,
actually, there are corresponding vocabulary_id to the tables they will be used in:
Death Type
Cost Type
Device Type
Meas Type
Condition Type
Drug Type
Visit Type
Note Type
Obs Period Type
Observation Type
Procedure Type
And as @Christian_Reich said trey’re obligatory included into any Athena download package so you don’t see them in a list of vocabularies on Athena web-site.
this way, for example, for cost table you can use one of these concepts depending of what type of the payment was there