MIMIC is a dataset which consist of anonymous health-related data.
To make it easier for future versions of mimic, an Ontology is made in the form of an OMOP CDM to make it more general purpose.
The ontology itself can be seen in the picture below. For a better overview, use the file mimic-ontology.ttl in WebVOWL(as shown in Ontology) or in another ontology visualiser.