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CodeX (Common Oncology Data Elements eXtensions) is a HL7 FHIR Accelerator, with the purpose of building a community to accelerate interoperable data modeling and applications. CodeX seeks to accomplish this by advocating the use of a common language for cancer data, specifically the mCODE (minimal Common Oncology Data Elements) language. As a part of this effort, CodeX will work to ascertain and help develop new extensions to mCODE as critical Use Cases are established and refined.

Adoption of mCODE-based collection and sharing of cancer data will enable semantic interoperability between stakeholders which will then usher in step-change improvements in cancer care and research benefiting all cancer patients.

For background, see the more detailed overview. To stay up to date on all CodeX news, subscribe to the general mailing Listserv below.

Use Cases

A number of potential CodeX Use Cases are now in the Discovery phase. These are Use Cases that promise to substantially improve cancer care and research through community alignment around the use of mCODE and necessary extensions for the sharing of standardized, structured cancer data. Current and prospective CodeX members are reviewing and building out Use Cases that will become the first CodeX projects.

CodeX is also launching the mCODE Community of Practice to share best practices for basic mCODE implementation within EHRs for data collection and sharing across a growing number of use cases. 

Contact Steve Bratt or Greg Shemancik to join the conversation.


A warm welcome to CodeX’s Founding Members! CodeX is currently talking with tens of organizations who are interested in becoming members to enable Smarter Data in the Fight Against Caner. Contact Steve Bratt or Greg Shemancik to discuss membership options.


Building a community to accelerate the use of a common language for cancer data requires specialized, quality support. As this initiative rolls out, CodeX will document the roles and responsibilities for its Program/Project Management, Steering Committee, Operating Committee, and how CodeX will maintain architectural integrity and accelerate capabilities by training and sharing across the community.

HL7 has compiled an excellent resource on HL7 and its standards process and tools.

Check back in February for more information.


As CodeX Use Cases are prioritized and new projects are started, FHIR Implementation Guides, Best Practices and other projects will be linked here. Stay tuned.

Site Content

Recent Blog Posts

Since last October’s Cancer Data Summit, we’ve made substantial progress in our goal to enable interoperability across cancer patient data and systems. Using mCODE™ to collect, share, and extract data from EHRs means that every interaction between a clinician and cancer patient provides data that could be used to improve care for all future patients.
MITRE and the  HL7® FHIR® Accelerator CodeX Community invite you to a unique MITRE Listening Session on oncology clinical pathways and prior authorization of cancer therapies on June 26, 2020 from 10:00-11:30 EDT.  Oncology is a dynamic specialty with a rapid expansion of new therapies and tumor genomics.  Over the past five years the use of oncology clinical pathways became a standard approach to assist oncologists in treatment recommendations.…
Thanks to presenters Dr. Lawrence Shulman, Dr. Peter Gabriel of UPenn, Melanie Combs-Dyer - Director of Innovation at Mettle Solutions and Tyler Haydell - Senior Product Manager at Flatiron Health. The slides and a recording of the meeting can be found here. Please join the July 31, 2020 CodeX mCODE Community of Practice meeting on July 31, 2020, noon, where we will discuss the CodeX Oncology Clinical Pathways: Prior Authorization use case. We hope to see you there!


Position: CodeX Program Manager

Position: Deputy CodeX Lead

Position: Technical Lead

Position: Deputy CodeX Tech Lead

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