Do OMOP codes follow a hierarchy and if so where can I find this hierarchy? I see there is a concept_acnestor table that allows me to identify ancestors but I don’t have a great idea of the overall schema. For example, what are the top-level concepts or how are concepts generally structured? is it similar to ICD where the categories are (mostly) body systems or is it like snomed?
The reason I would need this is i am looking to bucket the concepts together in a meaningful way for a blockchain-based study.
Thanks a lot!
