This code system http://terminology.hl7.org/CodeSystem/missingtoothreason defines the following codes:

CodeDisplayDefinition
e EExtraction
c CCongenital
u UUnknown
o OOther
 <status value="draft"/> <experimental value="false"/> <date value="2022-02-23T19:42:18-07:00"/> <publisher value="Financial Management"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="This value set includes sample Missing Tooth Reason codes."/> <copyright value="This is an example set."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/missing-tooth-reason"/> <content value="complete"/> <concept> <code value="e"/> <display value="E"/> <definition value="Extraction"/> </concept> <concept> <code value="c"/> <display value="C"/> <definition value="Congenital"/> </concept> <concept> <code value="u"/> <display value="U"/> <definition value="Unknown"/> </concept> <concept> <code value="o"/> <display value="O"/> <definition value="Other"/> </concept> </CodeSystem>