diff --git a/app/Controllers/Opd.php b/app/Controllers/Opd.php
index c192c4c..8d676bc 100644
--- a/app/Controllers/Opd.php
+++ b/app/Controllers/Opd.php
@@ -1364,10 +1364,8 @@ class Opd extends BaseController
         $query = $this->db->query($sql);
         $doctorMaster = $query->getResult();
 
-        $noOpdDays = 5 - 1;
-        if (count($doctorMaster) > 0 && !empty($doctorMaster[0]->opd_valid_no_days)) {
-            $noOpdDays = (int) $doctorMaster[0]->opd_valid_no_days - 1;
-        }
+        $doctorRow = $doctorMaster[0] ?? null;
+        $noOpdDays = $this->resolveOpdValiditySpanDays($doctorRow);
 
         $sql = "select d.id, d.p_fname, group_concat(m.SpecName) as SpecName,
             if(d.gender=1,'Male','Female') as xGender
@@ -3487,6 +3485,35 @@ class Opd extends BaseController
         return trim((string) ($row['s_value'] ?? ''));
     }
 
+    private function resolveOpdValiditySpanDays(?object $doctorRow): int
+    {
+        $validDays = (int) ($doctorRow->opd_valid_no_days ?? 0);
+        if ($validDays <= 0) {
+            $validDays = $this->getHospitalDefaultOpdValidityDays();
+        }
+
+        return max(0, $validDays - 1);
+    }
+
+    private function getHospitalDefaultOpdValidityDays(): int
+    {
+        $keys = [
+            'OPD_VALID_NO_DAYS',
+            'OPD_VALIDITY_DAYS',
+            'DEFAULT_OPD_VALID_NO_DAYS',
+            'DEFAULT_OPD_VALIDITY_DAYS',
+        ];
+
+        foreach ($keys as $key) {
+            $value = (int) $this->readSettingValueFromDb($key);
+            if ($value > 0) {
+                return min(365, $value);
+            }
+        }
+
+        return 5;
+    }
+
     private function buildOpdLetterPrintData(int $opdId, int $sessionId = 0, bool $includeContent = true): ?array
     {
         $sql = "Select * from opd_master where opd_id=" . (int) $opdId;
@@ -3499,7 +3526,7 @@ class Opd extends BaseController
 
         $data = [];
         $docId = (int) ($opdMaster[0]->doc_id ?? 0);
-        $noOpdDays = 5 - 1;
+        $noOpdDays = $this->resolveOpdValiditySpanDays(null);
 
         $data['doctor_master'] = [];
         if ($docId > 0) {
@@ -3511,9 +3538,7 @@ class Opd extends BaseController
                 group by d.id";
             $query = $this->db->query($sql);
             $data['doctor_master'] = $query->getResult();
-            if (!empty($data['doctor_master']) && !empty($data['doctor_master'][0]->opd_valid_no_days)) {
-                $noOpdDays = (int) $data['doctor_master'][0]->opd_valid_no_days - 1;
-            }
+            $noOpdDays = $this->resolveOpdValiditySpanDays($data['doctor_master'][0] ?? null);
         }
 
         $sql = "select o.*,date_format(o.apointment_date,'%d-%m-%Y') as str_apointment_date,
diff --git a/app/Controllers/Setting/Doctor.php b/app/Controllers/Setting/Doctor.php
index 3e5d5ef..f7ed326 100644
--- a/app/Controllers/Setting/Doctor.php
+++ b/app/Controllers/Setting/Doctor.php
@@ -27,6 +27,7 @@ class Doctor extends BaseController
             'template_options' => $templateContext['options'],
             'opd_print_template_options' => $templateContext['opd_print_options'],
             'template_fields' => $templateContext['fields'],
+            'hospital_default_opd_valid_no_days' => $this->getHospitalDefaultOpdValidityDays(),
         ]);
     }
 
@@ -47,6 +48,7 @@ class Doctor extends BaseController
                     'template_options' => $templateContext['options'],
                     'opd_print_template_options' => $templateContext['opd_print_options'],
                     'template_fields' => $templateContext['fields'],
+                    'hospital_default_opd_valid_no_days' => $this->getHospitalDefaultOpdValidityDays(),
                 ]);
             }
 
@@ -90,6 +92,11 @@ class Doctor extends BaseController
             'doc_sign' => $shortDescription,
         ];
 
+        $doctorFields = $this->db->tableExists('doctor_master') ? ($this->db->getFieldNames('doctor_master') ?? []) : [];
+        if (in_array('opd_valid_no_days', $doctorFields, true)) {
+            $data['opd_valid_no_days'] = $this->resolveOpdValidityInput((string) $this->request->getPost('input_opd_valid_no_days'));
+        }
+
         $templateContext = $this->getDoctorTemplateContext();
         $templateFieldMap = [
             'opd_print_format' => 'tmpl_opd_print_format',
@@ -125,6 +132,7 @@ class Doctor extends BaseController
                     'template_options' => $templateContext['options'],
                     'opd_print_template_options' => $templateContext['opd_print_options'],
                     'template_fields' => $templateContext['fields'],
+                    'hospital_default_opd_valid_no_days' => $this->getHospitalDefaultOpdValidityDays(),
                 ]);
             }
 
@@ -138,9 +146,11 @@ class Doctor extends BaseController
     {
         $doctorModel = new DoctorModel();
         $templateContext = $this->getDoctorTemplateContext();
+        $doctorRows = $doctorModel->getDoctorById($id);
+        $doctorRow = $doctorRows[0] ?? null;
 
         return view('Setting/Doctor/Doctor_profile_V', [
-            'data' => $doctorModel->getDoctorById($id),
+            'data' => $doctorRows,
             'doc_spec_a' => $doctorModel->getDoctorSpecs($id),
             'doc_spec_l' => $doctorModel->getSpecsList(),
             'doc_fee_type' => $doctorModel->getFeeTypes(),
@@ -150,6 +160,8 @@ class Doctor extends BaseController
             'template_options' => $templateContext['options'],
             'opd_print_template_options' => $templateContext['opd_print_options'],
             'template_fields' => $templateContext['fields'],
+            'hospital_default_opd_valid_no_days' => $this->getHospitalDefaultOpdValidityDays(),
+            'doctor_opd_valid_no_days' => $this->resolveDoctorOpdValidityDaysForView($doctorRow),
         ]);
     }
 
@@ -189,6 +201,11 @@ class Doctor extends BaseController
             'email1' => $this->request->getPost('input_email'),
         ];
 
+        $doctorFields = $this->db->tableExists('doctor_master') ? ($this->db->getFieldNames('doctor_master') ?? []) : [];
+        if (in_array('opd_valid_no_days', $doctorFields, true)) {
+            $data['opd_valid_no_days'] = $this->resolveOpdValidityInput((string) $this->request->getPost('input_opd_valid_no_days'));
+        }
+
         $templateContext = $this->getDoctorTemplateContext();
         $templateFieldMap = [
             'opd_print_format' => 'tmpl_opd_print_format',
@@ -695,4 +712,70 @@ class Doctor extends BaseController
         return $options;
     }
 
+    private function resolveDoctorOpdValidityDaysForView(?object $doctorRow): int
+    {
+        $doctorValue = (int) ($doctorRow->opd_valid_no_days ?? 0);
+        if ($doctorValue > 0) {
+            return $doctorValue;
+        }
+
+        return $this->getHospitalDefaultOpdValidityDays();
+    }
+
+    private function resolveOpdValidityInput(string $raw): int
+    {
+        $raw = trim($raw);
+        if ($raw === '') {
+            return $this->getHospitalDefaultOpdValidityDays();
+        }
+
+        $value = (int) $raw;
+        if ($value < 1) {
+            $value = 1;
+        }
+        if ($value > 365) {
+            $value = 365;
+        }
+
+        return $value;
+    }
+
+    private function getHospitalDefaultOpdValidityDays(): int
+    {
+        if (! $this->db->tableExists('hospital_setting')) {
+            return 5;
+        }
+
+        $keys = [
+            'OPD_VALID_NO_DAYS',
+            'OPD_VALIDITY_DAYS',
+            'DEFAULT_OPD_VALID_NO_DAYS',
+            'DEFAULT_OPD_VALIDITY_DAYS',
+        ];
+
+        $rows = $this->db->table('hospital_setting')
+            ->select('s_name,s_value')
+            ->whereIn('s_name', $keys)
+            ->get()
+            ->getResultArray();
+
+        $map = [];
+        foreach ($rows as $row) {
+            $name = strtoupper(trim((string) ($row['s_name'] ?? '')));
+            if ($name === '') {
+                continue;
+            }
+            $map[$name] = (string) ($row['s_value'] ?? '');
+        }
+
+        foreach ($keys as $key) {
+            $value = (int) ($map[$key] ?? 0);
+            if ($value > 0) {
+                return min(365, $value);
+            }
+        }
+
+        return 5;
+    }
+
 }
diff --git a/app/Models/OpdModel.php b/app/Models/OpdModel.php
index 5ee72d6..fe981a9 100644
--- a/app/Models/OpdModel.php
+++ b/app/Models/OpdModel.php
@@ -116,7 +116,50 @@ class OpdModel
             ->where('id', $docId)
             ->get()
             ->getRow();
-        $validDays = max(4, (int) ($docRow->opd_valid_no_days ?? 5) - 1);
-        return date('Y-m-d', strtotime('-' . $validDays . ' days'));
+        $validDays = (int) ($docRow->opd_valid_no_days ?? 0);
+        if ($validDays <= 0) {
+            $validDays = $this->getHospitalDefaultOpdValidityDays();
+        }
+
+        $spanDays = max(0, $validDays - 1);
+        return date('Y-m-d', strtotime('-' . $spanDays . ' days'));
+    }
+
+    private function getHospitalDefaultOpdValidityDays(): int
+    {
+        if (! $this->db->tableExists('hospital_setting')) {
+            return 5;
+        }
+
+        $keys = [
+            'OPD_VALID_NO_DAYS',
+            'OPD_VALIDITY_DAYS',
+            'DEFAULT_OPD_VALID_NO_DAYS',
+            'DEFAULT_OPD_VALIDITY_DAYS',
+        ];
+
+        $rows = $this->db->table('hospital_setting')
+            ->select('s_name,s_value')
+            ->whereIn('s_name', $keys)
+            ->get()
+            ->getResultArray();
+
+        $map = [];
+        foreach ($rows as $row) {
+            $name = strtoupper(trim((string) ($row['s_name'] ?? '')));
+            if ($name === '') {
+                continue;
+            }
+            $map[$name] = (string) ($row['s_value'] ?? '');
+        }
+
+        foreach ($keys as $key) {
+            $value = (int) ($map[$key] ?? 0);
+            if ($value > 0) {
+                return min(365, $value);
+            }
+        }
+
+        return 5;
     }
 }
diff --git a/app/Views/Setting/Doctor/Doctor_V.php b/app/Views/Setting/Doctor/Doctor_V.php
index a3b4967..51300bb 100644
--- a/app/Views/Setting/Doctor/Doctor_V.php
+++ b/app/Views/Setting/Doctor/Doctor_V.php
@@ -17,6 +17,11 @@
             [$dobDay, $dobMonth, $dobYear] = explode('/', $doctorDobValue);
             $doctorDobValue = $dobYear . '-' . $dobMonth . '-' . $dobDay;
         }
+        $hospitalDefaultOpdDays = (int) ($hospital_default_opd_valid_no_days ?? 5);
+        if ($hospitalDefaultOpdDays < 1) {
+            $hospitalDefaultOpdDays = 5;
+        }
+        $opdValidNoDaysInput = trim((string) ($formData['input_opd_valid_no_days'] ?? (string) $hospitalDefaultOpdDays));
         ?>
         <?php if (! empty($errors)) : ?>
             <div class="alert alert-danger">
@@ -74,6 +79,11 @@
                     <label class="form-label">Date of Birth</label>
                     <input class="form-control" name="datepicker_dob" type="date" value="<?= esc($doctorDobValue) ?>">
                 </div>
+                <div class="col-md-4">
+                    <label class="form-label">OPD Validity (Days)</label>
+                    <input class="form-control" name="input_opd_valid_no_days" placeholder="5" type="number" min="1" max="365" value="<?= esc($opdValidNoDaysInput) ?>">
+                    <small class="text-muted">Default hospital value: <?= esc((string) $hospitalDefaultOpdDays) ?> day(s)</small>
+                </div>
             </div>
             <?php
             $templateFieldSet = array_flip($template_fields ?? []);
diff --git a/app/Views/Setting/Doctor/Doctor_profile_V.php b/app/Views/Setting/Doctor/Doctor_profile_V.php
index ca87155..c150bce 100644
--- a/app/Views/Setting/Doctor/Doctor_profile_V.php
+++ b/app/Views/Setting/Doctor/Doctor_profile_V.php
@@ -1,6 +1,15 @@
 <?php
 $doctorRegNo = '';
 $doctorHprId = '';
+$hospitalDefaultOpdDays = (int) ($hospital_default_opd_valid_no_days ?? 5);
+if ($hospitalDefaultOpdDays < 1) {
+    $hospitalDefaultOpdDays = 5;
+}
+$existingDoctorOpdDays = (! empty($data) && ! empty($data[0])) ? (int) ($data[0]->opd_valid_no_days ?? 0) : 0;
+$doctorOpdValidNoDays = (int) ($doctor_opd_valid_no_days ?? ($existingDoctorOpdDays > 0 ? $existingDoctorOpdDays : $hospitalDefaultOpdDays));
+if ($doctorOpdValidNoDays < 1) {
+    $doctorOpdValidNoDays = $hospitalDefaultOpdDays;
+}
 if (!empty($data) && !empty($data[0])) {
     foreach (['nmc_reg_no', 'mci_reg_no', 'registration_no', 'reg_no', 'doctor_reg_no', 'doc_reg_no', 'council_reg_no'] as $regField) {
         if (isset($data[0]->{$regField}) && trim((string) $data[0]->{$regField}) !== '') {
@@ -97,6 +106,11 @@ if (!empty($data) && !empty($data[0]) && !empty($data[0]->dob)) {
                         <label class="form-label">Date of Birth</label>
                         <input class="form-control" name="datepicker_dob" value="<?= esc($doctorDobValue) ?>" type="date" />
                     </div>
+                    <div class="col-md-3">
+                        <label class="form-label">OPD Validity (Days)</label>
+                        <input class="form-control" name="input_opd_valid_no_days" placeholder="5" type="number" min="1" max="365" value="<?= esc((string) $doctorOpdValidNoDays) ?>" />
+                        <small class="text-muted">Default hospital value: <?= esc((string) $hospitalDefaultOpdDays) ?> day(s)</small>
+                    </div>
                 </div>
                 <div class="row g-3 mt-1">
                     <div class="col-md-12">