This code system http://terminology.hl7.org/CodeSystem/ADAAreaOralCavitySystem defines many codes, but they are not represented here

 <status value="active"/> <experimental value="false"/> <date value="2022-04-07T00:00:00-00:00"/> <publisher value="American Dental Association"/> <contact> <name value="American Dental Association; 211 East Chicago Avenue Chicago, IL 60610-2678"/> </contact> <description value="The Area of Oral Cavity System is accepted and approved by the ADA and is the most commonly used system used by dental professionals in America. Area of the oral cavity is designated by a two-digit code. The Area of Oral Cavity System can be found in the ADA Comprehensive ADA Dental Claim Form Completion Instructions (see https://www.ada.org/-/media/project/ada-organization/ada/ada-org/files/publications/cdt/v2019adadentalclaimcompletioninstructions_v3_2022feb.pdf). For more information see here: https://www.ada.org/publications/cdt/ada-dental-claim-form. A Statement of Understanding (SOU) between ADA and HL7 exists here: http://www.hl7.org/documentcenter/public/mou/ADA%20HL7%20SOU%202021_signed.pdf"/> <copyright value="No 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"/> <caseSensitive value="true"/> <content value="not-present"/> </CodeSystem>