The NMD Data Dictionary describes all of the data elements for the National Mammography Database, including whether or not a field is required and what responses are valid. There are two versions available:

  • NMD Version 2.0/2.1/2.2, based on BI-RADS® 4th Edition (2004)

  • NMD Version 3.0/3.1, based on BI-RADS® 5th Edition (2013)

These documents are updated periodically as the registry evolves to add and modify data elements collected.

You are strongly encouraged to use the Version 3.0/3.1/3.2 format since, at some point, Version 2.0/2.1/2.2 will be considered obsolete and no longer accepted by the NMD. Version 3.0/3.1/3.2 is also a more robust format that captures data for ultrasound, MRI, and combination exams in addition to mammography.


  • NMD 2.0/2.1/2.2, November 9, 2020
  • NMD 3.0/3.1, November 18, 2019