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CodeX (Common Oncology Data Elements eXtensions) is an HL7 FHIR Accelerator, building a community to accelerate interoperable data modeling and applications based on a common language for cancer data.  The language is mCODE (minimal Common Oncology Data Elements) often with extensions developed through CodeX for the new, critical use cases. 

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

For background, see the more detailed overview. Subscribe to the general mailing Listserv below to keep up to date on CodeX.

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 sharing of standard, structured cancer data.  Current and prospective CodeX members are reviewing and building out Use Cases that will become the first CodeX projects. We are also launching the mCODE Community of Practice to share best practices for basic mCODE implementation within EHRs for routine data collection and sharing.  Contact Steve Bratt or Greg Shemancik to join the conversation.


Welcome to our Founding Members!  We are talking with tens of organizations interested in joining CodeX.  Contact Steve Bratt or Greg Shemancik to discuss membership options.


Building a community to accelerate a common language for cancer data requires specialized, quality support. As the CodeX initiative rolls out, we will document the roles and responsibilities for CodeX Program/Project Management, the Steering Committee, the Operating Committee, and how we'll 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.

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Position: CodeX Lead

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