This is the crux, here. What is the use case?
OMOP is a patient-centric model generating “the evidence that promotes better health decisions and better care”, according to our mission. Do you think it matters for health decisions and care who does the claiming? It might, I am just not aware of such research.
Or does it have to do with the healthcare system and their assignment of resources, which means we should look at the COST table to support use cases.