diff --git a/Modules/Internal/Http/Controllers/Api/CorporateController.php b/Modules/Internal/Http/Controllers/Api/CorporateController.php
index c095f8a4..abc66eb0 100755
--- a/Modules/Internal/Http/Controllers/Api/CorporateController.php
+++ b/Modules/Internal/Http/Controllers/Api/CorporateController.php
@@ -303,7 +303,7 @@ class CorporateController extends Controller
     public function update(Request $request, $id)
     {
         $request->validate([
-            'code' => 'required|regex:/^[a-zA-Z0-9]+$/',
+            'code' => 'required|regex:/^[a-zA-Z0-9_]+$/',
             'payor_id' => 'required',
             'name' => 'required',
             'policy_code' => 'required_with:policy_id',