Right now MedDRA is a classification on top of SNOMED. Reason is the use case: MedDRA is not a vocabulary of data converted to OMOP CDM (source vocabulary), but one that is used to define cohorts. Reason is that MedDRA is used for recording adverse events in Clinical Trials, which currently are not typically converted to OMOP. Instead, the use case is to find equivalent patients to those in clinical trials, for which a classification is better suited.
Any reason we want to change that?