diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js
index 62446e43cc..dbb41f6154 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js
@@ -473,8 +473,8 @@
     },
 
     _getReviewerSuggestionsProvider(change) {
-      const provider = new GrReviewerSuggestionsProvider(this.$.restAPI,
-          change._number, true);
+      const provider = GrReviewerSuggestionsProvider.create(this.$.restAPI,
+          change._number, Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.ANY);
       provider.init();
       return provider;
     },
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.html b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.html
index 38c4a969b3..12698fc9cb 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.html
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.html
@@ -184,7 +184,7 @@ limitations under the License.
               allow-any-input
               placeholder="Add CC..."
               on-account-text-changed="_handleAccountTextEntry"
-              suggestions-provider="[[_getReviewerSuggestionsProvider(change)]]">
+              suggestions-provider="[[_getCcSuggestionsProvider(change)]]">
           </gr-account-list>
         </div>
         <gr-overlay
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js
index 6b7359fd34..bc25c61865 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js
@@ -897,8 +897,15 @@
     },
 
     _getReviewerSuggestionsProvider(change) {
-      const provider = new GrReviewerSuggestionsProvider(this.$.restAPI,
-          change._number, false);
+      const provider = GrReviewerSuggestionsProvider.create(this.$.restAPI,
+          change._number, Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.REVIEWER);
+      provider.init();
+      return provider;
+    },
+
+    _getCcSuggestionsProvider(change) {
+      const provider = GrReviewerSuggestionsProvider.create(this.$.restAPI,
+          change._number, Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.CC);
       provider.init();
       return provider;
     },
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
index 417fa23150..b63acda9e0 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
@@ -1293,9 +1293,24 @@
      * @param {function(?Response, string=)=} opt_errFn
      */
     getChangeSuggestedReviewers(changeNum, inputVal, opt_errFn) {
+      return this._getChangeSuggestedGroup('REVIEWER', changeNum, inputVal,
+          opt_errFn);
+    },
+
+    /**
+     * @param {number|string} changeNum
+     * @param {string} inputVal
+     * @param {function(?Response, string=)=} opt_errFn
+     */
+    getChangeSuggestedCCs(changeNum, inputVal, opt_errFn) {
+      return this._getChangeSuggestedGroup('CC', changeNum, inputVal,
+          opt_errFn);
+    },
+
+    _getChangeSuggestedGroup(reviewerState, changeNum, inputVal, opt_errFn) {
       // More suggestions may obscure content underneath in the reply dialog,
       // see issue 10793.
-      const params = {n: 6};
+      const params = {'n': 6, 'reviewer-state': reviewerState};
       if (inputVal) { params.q = inputVal; }
       return this._getChangeURLAndFetch({
         changeNum,
diff --git a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.js b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.js
index 7f1a9b19cb..c83e5a2235 100644
--- a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.js
+++ b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.js
@@ -21,10 +21,36 @@
     return;
   }
 
+  /**
+   * @enum {string}
+   */
+  Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES = {
+    REVIEWER: 'reviewers',
+    CC: 'ccs',
+    ANY: 'any',
+  };
+
   class GrReviewerSuggestionsProvider {
-    constructor(restAPI, changeNumber, allowAnyUser) {
+    static create(restApi, changeNumber, usersType) {
+      switch (usersType) {
+        case Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.REVIEWER:
+          return new GrReviewerSuggestionsProvider(restApi, changeNumber,
+            input => restApi.getChangeSuggestedReviewers(changeNumber, input));
+        case Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.CC:
+          return new GrReviewerSuggestionsProvider(restApi, changeNumber,
+            input => restApi.getChangeSuggestedCCs(changeNumber, input));
+        case Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.ANY:
+          return new GrReviewerSuggestionsProvider(restApi, changeNumber,
+            input => restApi.getSuggestedAccounts(
+                `cansee:${changeNumber} ${input}`));
+        default:
+          throw new Error(`Unknown users type: ${usersType}`);
+      }
+    }
+
+    constructor(restAPI, changeNumber, apiCall) {
       this._changeNumber = changeNumber;
-      this._allowAnyUser = allowAnyUser;
+      this._apiCall = apiCall;
       this._restAPI = restAPI;
     }
 
@@ -49,12 +75,9 @@
       if (!this._initialized || !this._loggedIn) {
         return Promise.resolve([]);
       }
-      const api = this._restAPI;
-      const xhr = this._allowAnyUser ?
-          api.getSuggestedAccounts(`cansee:${this._changeNumber} ${input}`) :
-          api.getChangeSuggestedReviewers(this._changeNumber, input);
 
-      return xhr.then(reviewers => (reviewers || []));
+      return this._apiCall(input)
+          .then(reviewers => (reviewers || []));
     }
 
     makeSuggestionItem(suggestion) {
diff --git a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.html b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.html
index bb7352096f..ca3c277761 100644
--- a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.html
+++ b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.html
@@ -109,8 +109,8 @@ limitations under the License.
     });
     suite('allowAnyUser set to false', () => {
       setup(done => {
-        provider = new GrReviewerSuggestionsProvider(restAPI, change._number,
-            false);
+        provider = GrReviewerSuggestionsProvider.create(restAPI, change._number,
+            Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.REVIEWER);
         provider.init().then(done);
       });
       suite('stubbed values for _getReviewerSuggestions', () => {
@@ -235,8 +235,8 @@ limitations under the License.
 
     suite('allowAnyUser set to true', () => {
       setup(done => {
-        provider = new GrReviewerSuggestionsProvider(restAPI, change._number,
-            true);
+        provider = GrReviewerSuggestionsProvider.create(restAPI, change._number,
+            Gerrit.SUGGESTIONS_PROVIDERS_USERS_TYPES.ANY);
         provider.init().then(done);
       });