diff --git a/src/lint/linter/ArcanistJscsLinter.php b/src/lint/linter/ArcanistJscsLinter.php
--- a/src/lint/linter/ArcanistJscsLinter.php
+++ b/src/lint/linter/ArcanistJscsLinter.php
@@ -104,28 +104,29 @@
     $messages = array();
     foreach ($report_dom->getElementsByTagName('file') as $file) {
       foreach ($file->getElementsByTagName('error') as $error) {
-        $message = new ArcanistLintMessage();
-        $message->setPath($path);
-        $message->setLine($error->getAttribute('line'));
-        $message->setChar($error->getAttribute('column'));
-        $message->setCode('JSCS');
-        $message->setName('JSCS');
-        $message->setDescription($error->getAttribute('message'));
-
         switch ($error->getAttribute('severity')) {
           case 'error':
-            $message->setSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
+            $code = 'JSCS.E';
             break;
 
           case 'warning':
-            $message->setSeverity(ArcanistLintSeverity::SEVERITY_WARNING);
+            $code = 'JSCS.W';
             break;
 
           default:
-            $message->setSeverity(ArcanistLintSeverity::SEVERITY_ADVICE);
+            $code = 'JSCS.A';
             break;
         }
 
+        $message = new ArcanistLintMessage();
+        $message->setPath($path);
+        $message->setLine($error->getAttribute('line'));
+        $message->setChar($error->getAttribute('column'));
+        $message->setName('JSCS');
+        $message->setDescription($error->getAttribute('message'));
+        $message->setCode($code);
+        $message->setSeverity($this->getLintMessageSeverity($code));
+
         $messages[] = $message;
       }
     }
@@ -133,17 +134,31 @@
     return $messages;
   }
 
+  protected function getDefaultMessageSeverity($code) {
+    if (preg_match('/^JSCS\\.E/', $code)) {
+      return ArcanistLintSeverity::SEVERITY_ERROR;
+    }
+
+    if (preg_match('/^JSCS\\.W/', $code)) {
+      return ArcanistLintSeverity::SEVERITY_WARNING;
+    }
+
+    return ArcanistLintSeverity::SEVERITY_ADVICE;
+  }
+
   protected function getLintCodeFromLinterConfigurationKey($code) {
+    if (!preg_match('/^JSCS\\.(E|W|A)/', $code)) {
+      throw new Exception(
+        pht(
+          "Invalid severity code '%s', should begin with 'JSCS.'.",
+          $code));
+    }
 
     // NOTE: We can't figure out which rule generated each message, so we
-    // can not customize severities.
+    // can not customize severities past error/warning/advice.
     //
     // See https://github.com/mdevils/node-jscs/issues/224
-
-    throw new Exception(
-      pht(
-        "JSCS does not currently support custom severity levels, because ".
-        "rules can't be identified from messages in output."));
+    return $code;
   }
 
 }
diff --git a/src/lint/linter/__tests__/jscs/curly-brace.lint-test b/src/lint/linter/__tests__/jscs/curly-brace.lint-test
--- a/src/lint/linter/__tests__/jscs/curly-brace.lint-test
+++ b/src/lint/linter/__tests__/jscs/curly-brace.lint-test
@@ -1,9 +1,14 @@
 function foo() {
-  if (true) return "foo"; else return "bar";
+  if ( true ) return "foo"; else return "bar";
+  var a = [
+    1,
+    2,
+  ];
 }
 ~~~~~~~~~~
 error:2:3
-error:2:27
+error:2:29
+error:5:7
 ~~~~~~~~~~
 ~~~~~~~~~~
 {