10/18/2021: ATLAS will be offline for maintenance on Friday, October 29, from 12:00 pm to 5:00 pm.

10/15/2021: Leaf will be offline for maintenance on Friday, October 15, from 6:00 pm to 10:00 pm.

09/20/2021: De-identified COVID-19 data set is refreshed every Monday. To access, click here.

08/03/2021: MSDW 2020 User Survey Responses and Feedback is available. To review, click here.

The MSDW team offers data services to support your research and quality improvement initiatives. Begin your research with any of the following tools:



A lightweight drag-and-drop query tool that enables you to easily create patient cohorts from de-identified data. Request Access.

Leaf Tutorial  |  Launch Leaf


ATLAS is a web-based query tool developed by the OHDSI community that can be used to analyze de-identified data from Epic that has been standardized in the OMOP CDM format. Mount Sinai users with only a hospital account can request a school account for access.

ATLAS Tutorial  |  Launch ATLAS


TriNetX is a global health research network that connects health systems, such as Mount Sinai, to biopharmaceutical companies and CROs. This web-based query tool allows you to query de-identified Epic data from the MSDW instance of OMOP, including demographics, diagnoses, lab results and more. Request Access.

TriNetX Tutorial  |  Launch TriNetX

COVID-19 Data Sets

The de-identified COVID-19 data sets, created and maintained by the MSDW team, is updated weekly. This patient cohort includes all patients with an encounter at a Mount Sinai facility who have been screened for or diagnosed with COVID-19. The identified version of this data set is available with appropriate approval documents.

Download de-identified COVID-19 research data

Custom Data Set

The MSDW team will work with you to create a custom data set for your research or quality improvement project. Data can be drawn from the MSDW Epic-centric instance of OMOP, Epic’s Clarity or Caboodle databases, and from additional databases as need beSee more information on the Custom Data Request process.

Query Request Form

Data De-Identification Service

The data de-identification service provided by the MSDW team ensures that all 18 protected health information (PHI) identifiers, as enumerated in the HIPAA Privacy Rule, have been masked or removed from a discreet data set. This de-identification service is not available for free text notes

About De-Identification Service

All publications must include the following language in the acknowledgments section: “This work was supported in part through the Mount Sinai Data Warehouse (MSDW) resources and staff expertise provided by Scientific Computing and Data at the Icahn School of Medicine at Mount Sinai.” See Data Use Agreement.