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SNODENT - Systematized Nomenclature of Dentistry

Updates to SNODENT

Since its acceptance as an American National Standard in 2016, SNODENT is managed in an ongoing manner according to American National Standards Institute (ANSI) Canvass process rules. The most recent SNODENT Canvass process was completed in October of 2018. Contact for information about the ADA's SNODENT Canvass process.

View the most current version of the SNODENT standard

Since 2007, the ADA has made the following changes to SNODENT:

  • Eliminated the “Not Otherwise Specified” (NOS) designation
  • Identified “frequently used terms” and added terms from the ADA health history form    
  • Assigned concepts to hierarchies
  • Reviewed descriptions that were assigned to the concepts
  • Reviewed synonyms for the concepts
  • Developed a cross-walk from SNODENT to ICD-10-CM
  • Obtained recognition of SNODENT as an American National Standard and instituted a formal, open, consensus-based change management process
  • Harmonized SNODENT content with the Dental Diagnostic System (Formerly EZ Codes) to create a new reference set, SNO-DDS.
  • Selected the most frequently observed, recorded, and diagnosed conditions from General Dentistry perspective to create SNO-DDS GD.

SNODENT now conforms to the “Vocabulary Desiderata”. The Desiderata identifies 12 characteristics that constitute a good vocabulary. Read more about the 12 characteristics.

SNODENT structure is made up of many concepts. It is not just diagnostic codes. It contains 18 categories divided between: “clinical findings,” “body structure,” “observable entity,” “physical objects,” “specimen,” “substances” etc. This allows SNODENT to be a comprehensive terminology for Electronic Dental Records (EDRs) and useful for information exchange.