We don’t have a need for it. The code comes from the Medicare Specialty vocabulary and is a “Medicare provider/supplier specialty codes”. It is not in our source Visit data. I believe this code is more relevant to the Provider Specialty domain than the Visit domain. A wise man once said, Visits and Care Sites don’t have specialties 
Isn’t that true, @Christian_Reich?
I thought the goal of the Visit Occurrence table was to distinguish Inpatient visit from Outpatient visit, etc. to be used as a proxy for the severity of disease??? Or am I way off, @Christian_Reich? I haven’t been with the community since its inception. And I think inpatient versus outpatient might still be useful for folks. If yes, each Visit concept_id should have one parent or be the “top dog”. And the top dogs shouldn’t be ambiguous.