diff --git a/src/Microsoft.Health.Fhir.CodeGen/Language/Firely/CSharpFirely2.cs b/src/Microsoft.Health.Fhir.CodeGen/Language/Firely/CSharpFirely2.cs
index 89c02e3c1..6bdca6cae 100644
--- a/src/Microsoft.Health.Fhir.CodeGen/Language/Firely/CSharpFirely2.cs
+++ b/src/Microsoft.Health.Fhir.CodeGen/Language/Firely/CSharpFirely2.cs
@@ -2656,6 +2656,9 @@ private bool WriteEnum(
 
         foreach (FhirConcept concept in concepts)
         {
+            if (concept.IsAbstract is true)
+                continue;
+
             string codeName = ConvertEnumValue(concept.Code);
             string codeValue = FhirSanitizationUtils.SanitizeForValue(concept.Code);
             string description = string.IsNullOrEmpty(concept.Definition)