diff --git a/app/Controllers/Opd.php b/app/Controllers/Opd.php
index 0ea7603..c192c4c 100644
--- a/app/Controllers/Opd.php
+++ b/app/Controllers/Opd.php
@@ -2197,7 +2197,16 @@ class Opd extends BaseController
         $opdNo = (string) ($opd->opd_code ?? '');
         $opdDate = (string) ($opd->str_apointment_date ?? '');
         $expDate = trim((string) ($opd->opd_Exp_Date ?? ''));
-        $expDateText = $expDate !== '' ? ('<b>Valid Upto : </b>' . esc($expDate)) : '';
+        $isRunningOpdEntry = ((int) ($opd->running_opd ?? 0) === 1)
+            || ((int) ($opd->opd_fee_type ?? 0) === 3);
+        if ($isRunningOpdEntry && !empty($data['old_opd'][0] ?? null)) {
+            $oldExpDate = trim((string) ($data['old_opd'][0]->opd_Exp_Date ?? ''));
+            $oldStartDate = trim((string) ($data['old_opd'][0]->str_apointment_date ?? ''));
+            $expDateText = ($oldStartDate !== '' ? 'OPD Start Date : ' . esc($oldStartDate) . '<br>' : '')
+                . ($oldExpDate !== '' ? '<b>Valid Upto : </b>' . esc($oldExpDate) : '');
+        } else {
+            $expDateText = $expDate !== '' ? ('<b>Valid Upto : </b>' . esc($expDate)) : '';
+        }
 
         $specName = trim((string) ($doctor->SpecName ?? $opd->doc_spec ?? ''));
         $doctorShortDescription = trim((string) ($doctor->doc_sign ?? $opd->doc_sign ?? ''));
diff --git a/app/Models/OpdModel.php b/app/Models/OpdModel.php
index 9851064..5ee72d6 100644
--- a/app/Models/OpdModel.php
+++ b/app/Models/OpdModel.php
@@ -66,7 +66,7 @@ class OpdModel
 
             $lastOpdRow = $this->db->table('opd_master')
                 ->select('max(opd_id) as last_opd_id')
-                ->where('apointment_date >=', date('Y-m-d', strtotime('-4 days')))
+                ->where('apointment_date >=', $this->resolveRunningLookupDate($docId))
                 ->where('apointment_date <=', date('Y-m-d'))
                 ->where('running_opd', 0)
                 ->where('opd_fee_type <>', 3)
@@ -108,4 +108,15 @@ class OpdModel
 
         return $insertId;
     }
+
+    private function resolveRunningLookupDate(int $docId): string
+    {
+        $docRow = $this->db->table('doctor_master')
+            ->select('opd_valid_no_days')
+            ->where('id', $docId)
+            ->get()
+            ->getRow();
+        $validDays = max(4, (int) ($docRow->opd_valid_no_days ?? 5) - 1);
+        return date('Y-m-d', strtotime('-' . $validDays . ' days'));
+    }
 }