diff --git a/sdk/digitaltwins/azure-digitaltwins-core/API design.md b/sdk/digitaltwins/azure-digitaltwins-core/API design.md
index cb386611f147d..5f024005ca117 100644
--- a/sdk/digitaltwins/azure-digitaltwins-core/API design.md	
+++ b/sdk/digitaltwins/azure-digitaltwins-core/API design.md	
@@ -802,43 +802,11 @@ When updating a model, the payload for a multi-operation json patch follows the
 Async APIs
 
 ```java
-    
-    /**
-     * Decommissions a model.
-     * @param modelId The Id of the model to decommission.
-     */
-    @ServiceMethod(returns = ReturnType.SINGLE)
-    public Mono<Void> decommissionModel(String modelId) { }
-
-    /**
-     * Decommissions a model.
-     * @param modelId The Id of the model to decommission.
-     * @return The http response.
-     */
-    @ServiceMethod(returns = ReturnType.SINGLE)
-    public Mono<Response> decommissionModelWithResponse(String modelId) { }
 
 ```
 
 Sync APIs
 ```java
- /**
-
-    /**
-     * Decommissions a model.
-     * @param modelId The Id of the model to decommission.
-     */
-    @ServiceMethod(returns = ReturnType.SINGLE)
-    public Void decommissionModel(String modelId) { }
-
-    /**
-     * Decommissions a model.
-     * @param modelId The Id of the model to decommission.
-     * @param context Additional context that is passed through the Http pipeline during the service call.
-     * @return The http response.
-     */
-    @ServiceMethod(returns = ReturnType.SINGLE)
-    public Response decommissionModelWithResponse(String modelId, Context context) { }
 
 ```
 
diff --git a/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsAsyncClient.java b/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsAsyncClient.java
index 45139226e5ba6..8f54858ee3233 100644
--- a/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsAsyncClient.java
+++ b/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsAsyncClient.java
@@ -20,6 +20,7 @@
 import com.azure.digitaltwins.core.util.DigitalTwinsResponse;
 import com.azure.digitaltwins.core.util.DigitalTwinsResponseHeaders;
 import com.azure.digitaltwins.core.util.ListModelOptions;
+import com.azure.digitaltwins.core.util.UpdateOperationUtility;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.module.SimpleModule;
@@ -593,8 +594,8 @@ Mono<PagedResponse<ModelData>> createModelsSinglePageAsync(List<String> models,
      */
     @ServiceMethod(returns = ReturnType.SINGLE)
     public Mono<ModelData> getModel(String modelId) {
-        return withContext(context -> getModelWithResponse(modelId, context))
-            .flatMap(response -> Mono.just(response.getValue()));
+        return getModelWithResponse(modelId)
+            .map(Response::getValue);
     }
 
     /**
@@ -665,8 +666,8 @@ Mono<PagedResponse<ModelData>> listModelsNextSinglePageAsync(String nextLink, Co
      */
     @ServiceMethod(returns = ReturnType.SINGLE)
     public Mono<Void> deleteModel(String modelId) {
-        return withContext(context -> deleteModelWithResponse(modelId, context))
-            .flatMap(response -> Mono.just(response.getValue()));
+        return deleteModelWithResponse(modelId)
+            .map(Response::getValue);
     }
 
     /**
@@ -683,11 +684,36 @@ Mono<Response<Void>> deleteModelWithResponse(String modelId, Context context){
         return protocolLayer.getDigitalTwinModels().deleteWithResponseAsync(modelId, context);
     }
 
-    //TODO: Decommission Model APIs (waiting for Abhipsa's change to come in)
     PagedFlux<String> listRelationships(String digitalTwinId, String relationshipName, Context context) {
         return new PagedFlux<>(
             () -> listRelationshipsFirstPage(digitalTwinId, relationshipName, context),
             nextLink -> listRelationshipsNextPage(nextLink, context));
     }
 
+    /**
+     * Decommissions a model.
+     * @param modelId The Id of the model to decommission.
+     * @return an empty Mono
+     */
+    public Mono<Void> decommissionModel(String modelId) {
+        return decommissionModelWithResponse(modelId)
+            .map(Response::getValue);
+    }
+
+    /**
+     * Decommissions a model.
+     * @param modelId The Id of the model to decommission.
+     * @return The http response.
+     */
+    public Mono<Response<Void>> decommissionModelWithResponse(String modelId) {
+        return withContext(context -> decommissionModelWithResponse(modelId, context));
+    }
+
+    Mono<Response<Void>> decommissionModelWithResponse(String modelId, Context context) {
+        List<Object> updateOperation = new UpdateOperationUtility()
+            .appendReplaceOperation("/decommissioned", true)
+            .getUpdateOperations();
+
+        return protocolLayer.getDigitalTwinModels().updateWithResponseAsync(modelId, updateOperation, context);
+    }
 }
diff --git a/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsClient.java b/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsClient.java
index 671484f6e5f88..8cfb8965635c8 100644
--- a/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsClient.java
+++ b/sdk/digitaltwins/azure-digitaltwins-core/src/main/java/com/azure/digitaltwins/core/DigitalTwinsClient.java
@@ -347,11 +347,10 @@ public PagedIterable<ModelData> listModels() {
     /**
      * Deletes a model.
      * @param modelId The Id for the model. The Id is globally unique and case sensitive.
-     * @return Void
      */
     @ServiceMethod(returns = ReturnType.SINGLE)
-    public Void deleteModel(String modelId) {
-        return digitalTwinsAsyncClient.deleteModel(modelId).block();
+    public void deleteModel(String modelId) {
+        deleteModelWithResponse(modelId, Context.NONE);
     }
 
     /**
@@ -365,6 +364,21 @@ public Response<Void> deleteModelWithResponse(String modelId, Context context) {
         return digitalTwinsAsyncClient.deleteModelWithResponse(modelId, context).block();
     }
 
-    //TODO: Decommission Model APIs (waiting for Abhipsa's change to come in)
+    /**
+     * Decommissions a model.
+     * @param modelId The Id of the model to decommission.
+     */
+    public void decommissionModel(String modelId) {
+        decommissionModelWithResponse(modelId, Context.NONE);
+    }
 
+    /**
+     * Decommissions a model.
+     * @param modelId The Id of the model to decommission.
+     * @param context Additional context that is passed through the Http pipeline during the service call.
+     * @return The http response.
+     */
+    public Response<Void> decommissionModelWithResponse(String modelId, Context context) {
+        return digitalTwinsAsyncClient.decommissionModelWithResponse(modelId, context).block();
+    }
 }
diff --git a/sdk/digitaltwins/azure-digitaltwins-core/src/test/java/com/azure/digitaltwins/core/DigitalTwinsTestBase.java b/sdk/digitaltwins/azure-digitaltwins-core/src/test/java/com/azure/digitaltwins/core/DigitalTwinsTestBase.java
index 4f9396d5be0e7..258df31566766 100644
--- a/sdk/digitaltwins/azure-digitaltwins-core/src/test/java/com/azure/digitaltwins/core/DigitalTwinsTestBase.java
+++ b/sdk/digitaltwins/azure-digitaltwins-core/src/test/java/com/azure/digitaltwins/core/DigitalTwinsTestBase.java
@@ -3,18 +3,12 @@
 import com.azure.core.credential.AccessToken;
 import com.azure.core.credential.TokenCredential;
 import com.azure.core.credential.TokenRequestContext;
-import com.azure.core.http.policy.HttpLogDetailLevel;
-import com.azure.core.http.policy.HttpLogOptions;
 import com.azure.core.http.policy.HttpPipelinePolicy;
 import com.azure.core.test.TestBase;
-import com.azure.core.test.TestMode;
 import com.azure.core.util.Configuration;
-import com.azure.core.util.logging.ClientLogger;
 import com.azure.identity.ClientSecretCredentialBuilder;
 import reactor.core.publisher.Mono;
 
-import java.util.Locale;
-
 public class DigitalTwinsTestBase extends TestBase
 {
     protected static final String TENANT_ID = Configuration.getGlobalConfiguration()