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Hierarchy of concept terms

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!

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You can start by looking at The Book of OHDSI vocabulary relationships

And you can also use visual possibilities of Athena (https://athena.ohdsi.org/) for finding of the top-level concepts and the hierarchy structure.

Both very helpful - thanks a lot!

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