Minimum OMOP Dataset
This page defines the OMOP CDM requirements for making your data discoverable via the Cohort Discovery Service.
Objective
The minimum dataset represents basic information about a patient — their condition, procedure, drug exposure, observations, and measurements — that helps researchers find and access cohorts for further analysis.
OMOP CDM Version Support
The Cohort Discovery Service supports OMOP CDM versions 5.3 and above. If you are mapping data for the first time, version 5.4 is recommended. If you have an existing 5.3 mapping, this is fully supported and no migration is required.
Supported versions are ultimately constrained by Bunny's deployment requirements. See the Bunny documentation for the latest information. If you are using a version older than 5.3, please contact us before proceeding.
Mandatory data requirements
Two tables are mandatory to be populated for all datasets:
- Person — must be populated with
person_ids for all individuals in the dataset. - Concept — must be populated with the
concept_ids for whatever clinical concepts are in use.
OHDSI defines the full OMOP CDM definition for version 5.3 . Tables other than Person and Concept might be present but are optional for being populated. Which ones you populate will depend on the nature of your dataset.
Field-Level Requirements
For full field-level detail — including data types, constraints, and descriptions for each OMOP table — refer to the official OMOP CDM documentation maintained by OHDSI:
OMOP CDM Documentation (OHDSI)
This is the authoritative reference for how each field should be populated across all supported CDM versions. Use it alongside this guide when preparing your OMOP mapping.
Bunny Compatibility
The Cohort Discovery minimum dataset is fully aligned with Bunny's deployment requirements. For field-level requirements specific to Bunny, see:
Unsupported tables
Tables not yet supported by Bunny can still be included in your OMOP CDM, but will only be surfaced by the Cohort Discovery Service after agreed adoption.