diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5876f44c57..a579967daa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Implemented partial class model declarations. [4894](https://github.com/microsoft/kiota/issues/4894)
+
 ### Added
 
 ### Changed
diff --git a/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs b/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs
index c6aa150712..040381a0fb 100644
--- a/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs
+++ b/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs
@@ -38,7 +38,7 @@ public override void WriteCodeElement(ClassDeclaration codeElement, LanguageWrit
         bool hasDescription = conventions.WriteLongDescription(parentClass, writer);
         conventions.WriteDeprecationAttribute(parentClass, writer);
         if (!hasDescription) writer.WriteLine("#pragma warning disable CS1591");
-        writer.WriteLine($"public class {codeElement.Name.ToFirstCharacterUpperCase()} {derivation}");
+        writer.WriteLine($"public partial class {codeElement.Name.ToFirstCharacterUpperCase()} {derivation}");
         if (!hasDescription) writer.WriteLine("#pragma warning restore CS1591");
         writer.StartBlock();
     }
diff --git a/tests/Kiota.Builder.Tests/Writers/CSharp/CodeClassDeclarationWriterTests.cs b/tests/Kiota.Builder.Tests/Writers/CSharp/CodeClassDeclarationWriterTests.cs
index 80bbe163f9..d9100b9886 100644
--- a/tests/Kiota.Builder.Tests/Writers/CSharp/CodeClassDeclarationWriterTests.cs
+++ b/tests/Kiota.Builder.Tests/Writers/CSharp/CodeClassDeclarationWriterTests.cs
@@ -51,7 +51,7 @@ public void WritesSimpleDeclaration()
     {
         codeElementWriter.WriteCodeElement(parentClass.StartBlock, writer);
         var result = tw.ToString();
-        Assert.Contains("public class", result);
+        Assert.Contains("public partial class", result);
     }
 
     [Fact]