When adding a new HTA External Code System Information page ensure that a row for the code system is added to the index at the following link: HTA — External Terminologies - Information – Code System Metadata Records Index

Data element name

Sub data element name


Code System Owner

NameAmerican Dental Association
Email address
Phone number
Address211 East Chicago Avenue Chicago, IL 60610-2678
Code System Maintainer (Steward)Name
Email address
Phone number
Code System PublisherName
Email address
Phone number
Code System NamesFormal name of the code systemADA Universal Tooth Designation System
Short name of the code systemADAUniversalToothDesignationSystem
Code System Technical IdentifiersHTA-endorsed URIhttp://terminology.hl7.org/CodeSystem/ADAUniversalToothDesignationSystem
HTA-endorsed OID
Other URIs
Other OIDs
Case Sensitive Codes (TRUE/FALSE)TRUE (default value)
Code System InformationLink

The American Dental Association (ADA) accepted the Universal/National Tooth Designation System and the ISO/ANSI/ADA Specification No. 3950 for Designation System for Teeth and Areas of the Oral Cavity as the human tooth and oral cavity enumeration schemas in 1994

The universal tooth designation or numbering system is accepted and approved by the ADA and is the most commonly used system used by dental professionals in America. 

Teeth are numbered 1-32, starting with the third molar (1) on the right side of the upper arch, following around the arch to the third molar (16) on the left side, and descending to the lower third molar (17) on the left side, and following that arch to the terminus of the lower jaw, the lower right third molar (32).

Supernumerary teeth are identified by the numbers 51 through 82, beginning with the area of the upper right third molar, following around the upper arch and continuing on the lower arch to the area of the lower right third molar (e.g., supernumerary #51 is adjacent to the upper right molar #1; supernumerary #82 is adjacent to the lower right third molar #32).

The Universal Numbering System can be found in the ADA Dental Claim Form. For more information see here: https://www.ada.org/publications/cdt/ada-dental-claim-form

Arrangement or agreements with HL7 for use of content
A Statement of Understanding (SOU) between ADA and HL7 exists here: http://www.hl7.org/documentcenter/public/mou/ADA%20HL7%20SOU%202021_signed.pdf
Version management

Code System Copyright, Intellectual Property and LicensingCopyright Statement

Copyright InformationNo official copyright statement is available. For general information see paper form located here : https://www.ada.org/-/media/project/ada-organization/ada/ada-org/files/publications/cdt/v2019adadentalclaimcompletioninstructions_v3_2022feb.pdf?rev=70d192ad312a47f285487c1d69de4190&hash=8EFBBD50FA335262C463823E1CA83DFE
Intellectual Property Information
Licensing Information
HTA endorsement status (Draft, In review, Endorsed for use, Pending re-endorsement, Retired) ValueEndorsed for Use
Assignment date20220407
HTA review statusLast review date20220407
Next review date20230407
Information current as at (date)
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