diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptNodeClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptNodeClientCodegen.java
index 38a512afc947..251e4f25140a 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptNodeClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptNodeClientCodegen.java
@@ -184,6 +184,11 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
             for (ModelMap mo : entry.getModels()) {
                 CodegenModel cm = mo.getModel();
 
+                // Filter out primitive types from parent property
+                if (cm.parent != null && isPrimitiveType(cm.parent)) {
+                    cm.parent = null;
+                }
+
                 // Add additional filename information for imports
                 mo.put("tsImports", toTsImports(cm, cm.imports));
             }
@@ -289,6 +294,26 @@ private boolean isLanguagePrimitive(String type) {
         return languageSpecificPrimitives.contains(type);
     }
 
+    /**
+     * Check if a type is a primitive TypeScript type (string, boolean, number).
+     * This is used to filter out primitive types from the parent property.
+     *
+     * @param type the type to check
+     * @return true if the type is a primitive type
+     */
+    private boolean isPrimitiveType(String type) {
+        if (type == null) {
+            return false;
+        }
+        // Check for primitive types (case-insensitive)
+        String lowerType = type.toLowerCase(Locale.ROOT);
+        return "string".equals(lowerType) || 
+               "boolean".equals(lowerType) || 
+               "number".equals(lowerType) ||
+               "any".equals(lowerType) ||
+               "array".equals(lowerType);
+    }
+
     // Determines if the given type is a generic/templated type (ie. ArrayList<String>)
     private boolean isLanguageGenericType(String type) {
         for (String genericType : languageGenericTypes) {
@@ -323,6 +348,15 @@ private String removeModelPrefixSuffix(String name) {
         return result;
     }
 
+    @Override
+    protected void addParentFromContainer(CodegenModel model, Schema schema) {
+        super.addParentFromContainer(model, schema);
+        // Filter out primitive types from parent property
+        if (model.parent != null && isPrimitiveType(model.parent)) {
+            model.parent = null;
+        }
+    }
+
     @Override
     protected void addAdditionPropertiesToCodeGenModel(CodegenModel codegenModel, Schema schema) {
         super.addAdditionPropertiesToCodeGenModel(codegenModel, schema);
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/typescript/typescriptnode/TypeScriptNodeModelTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/typescript/typescriptnode/TypeScriptNodeModelTest.java
index 23e342f4bc27..73da32e0f435 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/typescript/typescriptnode/TypeScriptNodeModelTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/typescript/typescriptnode/TypeScriptNodeModelTest.java
@@ -354,4 +354,35 @@ public void mappedFromModelTest() {
         Assert.assertEquals(cm.name, "ApiResponse");
         Assert.assertEquals(cm.classFilename, mappedName);
     }
+
+    @Test(description = "should exclude TypeScript primitive types from parent property")
+    public void modelShouldExcludePrimitiveTypesFromParentPropertyTest() {
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/model_with_additional_properties.yaml");
+        final DefaultCodegen codegen = new TypeScriptNodeClientCodegen();
+        codegen.setOpenAPI(openAPI);
+
+        // Check that all models with primitive additionalProperties don't have parent property set
+        for (String modelName : openAPI.getComponents().getSchemas().keySet()) {
+            final Schema schema = openAPI.getComponents().getSchemas().get(modelName);
+            final CodegenModel model = codegen.fromModel(modelName, schema);
+            Assert.assertNull(model.parent, "Model " + modelName + " should not have a parent property");
+        }
+    }
+
+    @Test(description = "should extend from parent")
+    public void shouldExtendFromParentTest() {
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/allOf.yaml");
+        final DefaultCodegen codegen = new TypeScriptNodeClientCodegen();
+        codegen.setOpenAPI(openAPI);
+
+        // Check that Child model extends Person
+        final Schema childSchema = openAPI.getComponents().getSchemas().get("Child");
+        final CodegenModel childModel = codegen.fromModel("Child", childSchema);
+        Assert.assertEquals(childModel.parent, "Person");
+
+        // Check that Adult model extends Person
+        final Schema adultSchema = openAPI.getComponents().getSchemas().get("Adult");
+        final CodegenModel adultModel = codegen.fromModel("Adult", adultSchema);
+        Assert.assertEquals(adultModel.parent, "Person");
+    }
 }
diff --git a/modules/openapi-generator/src/test/resources/3_0/model_with_additional_properties.yaml b/modules/openapi-generator/src/test/resources/3_0/model_with_additional_properties.yaml
new file mode 100644
index 000000000000..c2a6e64e30e6
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_0/model_with_additional_properties.yaml
@@ -0,0 +1,65 @@
+openapi: 3.0.0
+info:
+  version: 1.0.0
+  title: OpenAPI Petstore
+  license:
+    name: Apache-2.0
+    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
+paths:
+  /pet:
+    get:
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+components:
+  schemas:
+    Pet:
+      title: a Pet with string additionalProperties
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+      additionalProperties:
+        type: string
+    PetBoolean:
+      title: a Pet with boolean additionalProperties
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+      additionalProperties:
+        type: boolean
+    PetNumber:
+      title: a Pet with number additionalProperties
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+      additionalProperties:
+        type: number
+    PetAny:
+      title: a Pet with any additionalProperties
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+      additionalProperties: true
+    PetArray:
+      title: a Pet with array additionalProperties
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+      additionalProperties:
+        type: array
+        items:
+          type: string