diff --git a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryItemViewModel.kt b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryItemViewModel.kt
index ae7fd8f5b56..cb28de75047 100644
--- a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryItemViewModel.kt
+++ b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryItemViewModel.kt
@@ -11,7 +11,7 @@ import org.oppia.android.domain.translation.TranslationController
 /** Completed story view model for the recycler view in [CompletedStoryListFragment]. */
 class CompletedStoryItemViewModel(
   private val activity: AppCompatActivity,
-  private val internalProfileId: Int,
+  private val profileId: ProfileId,
   val completedStory: CompletedStory,
   val entityType: String,
   private val intentFactoryShim: IntentFactoryShim,
@@ -33,7 +33,7 @@ class CompletedStoryItemViewModel(
   /** Called when user clicks on CompletedStoryItem. */
   fun onCompletedStoryItemClicked() {
     routeToTopicPlayStory(
-      ProfileId.newBuilder().setInternalId(internalProfileId).build(),
+      profileId,
       completedStory.classroomId,
       completedStory.topicId,
       completedStory.storyId
diff --git a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivity.kt b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivity.kt
index fe2d803f0a7..6d4fe12f3d9 100644
--- a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivity.kt
@@ -21,8 +21,8 @@ class CompletedStoryListActivity : InjectableAutoLocalizedAppCompatActivity() {
     super.onCreate(savedInstanceState)
     (activityComponent as ActivityComponentImpl).inject(this)
 
-    val internalProfileId: Int = intent?.extractCurrentUserProfileId()?.internalId ?: -1
-    completedStoryListActivityPresenter.handleOnCreate(internalProfileId)
+    val profileId = intent?.extractCurrentUserProfileId() ?: ProfileId.getDefaultInstance()
+    completedStoryListActivityPresenter.handleOnCreate(profileId)
   }
 
   companion object {
diff --git a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivityPresenter.kt b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivityPresenter.kt
index de44ee70a2c..cb0cebfc2fa 100644
--- a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivityPresenter.kt
+++ b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListActivityPresenter.kt
@@ -3,6 +3,7 @@ package org.oppia.android.app.completedstorylist
 import androidx.appcompat.app.AppCompatActivity
 import org.oppia.android.R
 import org.oppia.android.app.activity.ActivityScope
+import org.oppia.android.app.model.ProfileId
 import javax.inject.Inject
 
 /** The presenter for [CompletedStoryListActivity]. */
@@ -12,7 +13,7 @@ class CompletedStoryListActivityPresenter @Inject constructor(
 ) {
 
   /** Initializes views for [CompletedStoryListActivity] and binds [CompletedStoryListFragment]. */
-  fun handleOnCreate(internalProfileId: Int) {
+  fun handleOnCreate(profileId: ProfileId) {
     activity.setContentView(R.layout.completed_story_list_activity)
     if (getCompletedStoryListFragment() == null) {
       activity
@@ -20,7 +21,7 @@ class CompletedStoryListActivityPresenter @Inject constructor(
         .beginTransaction()
         .add(
           R.id.completed_story_list_fragment_placeholder,
-          CompletedStoryListFragment.newInstance(internalProfileId),
+          CompletedStoryListFragment.newInstance(profileId),
           CompletedStoryListFragment.COMPLETED_STORY_LIST_FRAGMENT_TAG
         ).commitNow()
     }
diff --git a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragment.kt b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragment.kt
index 4f11f4df5e1..e1f0bb3b4aa 100644
--- a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragment.kt
+++ b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragment.kt
@@ -20,8 +20,7 @@ class CompletedStoryListFragment : InjectableFragment() {
     const val COMPLETED_STORY_LIST_FRAGMENT_TAG = "COMPLETED_STORY_LIST_FRAGMENT_TAG"
 
     /** Returns a new [CompletedStoryListFragment] to display corresponding to the specified profile ID. */
-    fun newInstance(internalProfileId: Int): CompletedStoryListFragment {
-      val profileId = ProfileId.newBuilder().setInternalId(internalProfileId).build()
+    fun newInstance(profileId: ProfileId): CompletedStoryListFragment {
       return CompletedStoryListFragment().apply {
         arguments = Bundle().apply {
           decorateWithUserProfileId(profileId)
@@ -47,11 +46,10 @@ class CompletedStoryListFragment : InjectableFragment() {
       "Expected arguments to be passed to CompletedStoryListFragment"
     }
     val profileId = arguments.extractCurrentUserProfileId()
-    val internalProfileId = profileId.internalId
     return completedStoryListFragmentPresenter.handleCreateView(
       inflater,
       container,
-      internalProfileId
+      profileId
     )
   }
 }
diff --git a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragmentPresenter.kt b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragmentPresenter.kt
index ed1a566d4de..02b2ae9cd68 100644
--- a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragmentPresenter.kt
+++ b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListFragmentPresenter.kt
@@ -7,6 +7,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import androidx.recyclerview.widget.GridLayoutManager
 import org.oppia.android.R
+import org.oppia.android.app.model.ProfileId
 import org.oppia.android.app.recyclerview.BindableAdapter
 import org.oppia.android.databinding.CompletedStoryItemBinding
 import org.oppia.android.databinding.CompletedStoryListFragmentBinding
@@ -26,9 +27,9 @@ class CompletedStoryListFragmentPresenter @Inject constructor(
   fun handleCreateView(
     inflater: LayoutInflater,
     container: ViewGroup?,
-    internalProfileId: Int
+    profileId: ProfileId
   ): View? {
-    viewModel.setProfileId(internalProfileId)
+    viewModel.setProfileId(profileId)
 
     binding = CompletedStoryListFragmentBinding
       .inflate(
diff --git a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListViewModel.kt b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListViewModel.kt
index 678d91b02ce..e2a02cc711d 100644
--- a/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListViewModel.kt
+++ b/app/src/main/java/org/oppia/android/app/completedstorylist/CompletedStoryListViewModel.kt
@@ -26,13 +26,11 @@ class CompletedStoryListViewModel @Inject constructor(
   private val translationController: TranslationController,
   @StoryHtmlParserEntityType private val entityType: String
 ) : ObservableViewModel() {
-  /** [internalProfileId] needs to be set before any of the live data members can be accessed. */
-  private var internalProfileId: Int = -1
+  /** [profileId] needs to be set before any of the live data members can be accessed. */
+  private var profileId: ProfileId = ProfileId.getDefaultInstance()
 
   private val completedStoryListResultLiveData: LiveData<AsyncResult<CompletedStoryList>> by lazy {
-    topicController.getCompletedStoryList(
-      ProfileId.newBuilder().setInternalId(internalProfileId).build()
-    ).toLiveData()
+    topicController.getCompletedStoryList(profileId).toLiveData()
   }
 
   private val completedStoryLiveData: LiveData<CompletedStoryList> by lazy {
@@ -45,8 +43,8 @@ class CompletedStoryListViewModel @Inject constructor(
   }
 
   /** Sets internalProfileId to this ViewModel. */
-  fun setProfileId(internalProfileId: Int) {
-    this.internalProfileId = internalProfileId
+  fun setProfileId(profileId: ProfileId) {
+    this.profileId = profileId
   }
 
   private fun processCompletedStoryListResult(
@@ -74,7 +72,7 @@ class CompletedStoryListViewModel @Inject constructor(
       completedStoryList.completedStoryList.map { completedStory ->
         CompletedStoryItemViewModel(
           activity,
-          internalProfileId,
+          profileId,
           completedStory,
           entityType,
           intentFactoryShim,