mCODE™ is a core set of structured data elements for oncology that establishes minimum recommended standards for the structure and content of health record information across use cases and users. The goal of mCODE is to improve the overall quality and consistency of cancer data available to clinicians, patients, researchers, and other stakeholders in the fight against cancer. For more information on mCODE, visit the website.

mCODE employs a Use Case development model. mCODE defines a “Use Case” as a set of oncology clinical circumstances for which certain common Data Elements can be described and identified as useful. A Data Element is a discrete piece of oncology clinical information, identified by reference to a Use Case, that is expressed in a structured, computable field.
It is expected that a new Use Case will incorporate some or all elements of the mCODE Core (the minimal set of Data Elements for common oncology Use Cases, as designated by the Executive Committee [EC]). The most current version of the mCODE Core and the data dictionary are available at The new data elements to be added to the data dictionary that are required to support a new use case will be referred to as an mCODE Supplement (a set of Data Elements that supplements the mCODE Core for a particular Use Case in an electronic health record application).

The development of the Use Case, including adding new data elements to the data dictionary to support the Use Case, will be the responsibility of the proposer of the Use Case. Each proposal for a new Use Case must be reviewed by the mCODE Technical Review Group (TRG) and approved by the mCODE EC. At any time, additional information may be requested from the proposer. Submission of this form does not guarantee approval. Once the TRG has done an initial review of the proposed use care, further development work (i.e., data modeling and implementation testing) may be referred to a new Working Group created by the EC or to the Common Oncology Data Elements eXtensions (CodeX) launched within the HL7 Fast Healthcare Interoperability Resources (FHIR) Accelerator program at the end of 2019. Please see the mCODE Submitted Use Case Review Process for an overview of the use case and data element review and approval process.