diff --git a/app/Controllers/Report.php b/app/Controllers/Report.php
index 3fc55b7..606dca5 100644
--- a/app/Controllers/Report.php
+++ b/app/Controllers/Report.php
@@ -698,8 +698,16 @@ class Report extends BaseController
             ->get()
             ->getResult();
 
+        $referDoctors = $this->db->table('doctor_master')
+            ->select('id, p_fname')
+            ->where('active', 1)
+            ->orderBy('p_fname', 'ASC')
+            ->get()
+            ->getResult();
+
         return view('report/diagnosis_report', [
             'item_types' => $itemTypes,
+            'refer_doctors' => $referDoctors,
         ]);
     }
 
@@ -870,9 +878,27 @@ class Report extends BaseController
         int $output = 0
     ) {
         [$minRange, $maxRange] = $this->parseDateRange($dateRange);
+        $referDoctorId = (int) ($this->request->getGet('refer_doctor_id') ?? 0);
+        $referDoctorLabel = 'All Refer Doctors';
 
         $netAmountExpr = "ROUND(IF(m.invoice_status=1, (t.item_amount - (t.item_amount * m.discount_amount / NULLIF(m.total_amount, 0))), 0), 2)";
 
+        $invoiceFields = $this->db->getFieldNames('invoice_master') ?? [];
+        $referByIdCol = $this->resolveExistingColumn($invoiceFields, ['refer_by_id', 'doctor_id', 'doc_id']);
+        $referByNameCol = $this->resolveExistingColumn($invoiceFields, ['refer_by_other', 'doc_name', 'doctor_name']);
+
+        if ($referDoctorId > 0 && $this->db->tableExists('doctor_master')) {
+            $doctorRow = $this->db->table('doctor_master')
+                ->select('p_fname')
+                ->where('id', $referDoctorId)
+                ->get()
+                ->getRow();
+
+            if ($doctorRow !== null && trim((string) ($doctorRow->p_fname ?? '')) !== '') {
+                $referDoctorLabel = (string) $doctorRow->p_fname;
+            }
+        }
+
         $builder = $this->db->table('invoice_master m');
         $builder->select('y.group_desc, t.item_name')
             ->select('COUNT(t.id) as no_test', false)
@@ -890,6 +916,14 @@ class Report extends BaseController
             ->where('m.inv_date >=', $minRange)
             ->where('m.inv_date <=', $maxRange);
 
+        if ($referDoctorId > 0) {
+            if ($referByIdCol !== null) {
+                $builder->where('m.' . $referByIdCol, $referDoctorId);
+            } elseif ($referByNameCol !== null && $referDoctorLabel !== 'All Refer Doctors') {
+                $builder->where('m.' . $referByNameCol, $referDoctorLabel);
+            }
+        }
+
         // Invoice type filter
         $invoiceTypeInt = (int) $invoiceType;
         if ($invoiceTypeInt === 1) {
@@ -922,6 +956,7 @@ class Report extends BaseController
             'min_range' => $minRange,
             'max_range' => $maxRange,
             'invoice_type_label' => $invoiceTypeLabel,
+            'refer_doctor_label' => $referDoctorLabel,
         ];
 
         $content = view('report/diagnosis_report_table', $data);
diff --git a/app/Views/report/diagnosis_report.php b/app/Views/report/diagnosis_report.php
index 546c684..2ee608a 100644
--- a/app/Views/report/diagnosis_report.php
+++ b/app/Views/report/diagnosis_report.php
@@ -1,5 +1,6 @@
 <?php
 $itemTypes = $item_types ?? [];
+$referDoctors = $refer_doctors ?? [];
 ?>
 <section class="content">
     <div class="card">
@@ -15,7 +16,7 @@ $itemTypes = $item_types ?? [];
                         <input type="datetime-local" class="form-control" id="report_end">
                     </div>
                 </div>
-                <div class="col-md-3">
+                <div class="col-md-2">
                     <label class="form-label">Invoice Type</label>
                     <select class="form-control" id="invoice_type" name="invoice_type">
                         <option value="0">All Types</option>
@@ -24,7 +25,16 @@ $itemTypes = $item_types ?? [];
                         <option value="3">Organization</option>
                     </select>
                 </div>
-                <div class="col-md-5">
+                <div class="col-md-3">
+                    <label class="form-label">Refer Doctor</label>
+                    <select class="form-control select2" id="refer_doctor_id" name="refer_doctor_id" data-placeholder="Select Refer Doctor">
+                        <option value="0">All Refer Doctors</option>
+                        <?php foreach ($referDoctors as $row) : ?>
+                            <option value="<?= esc($row->id ?? '') ?>"><?= esc($row->p_fname ?? '') ?></option>
+                        <?php endforeach; ?>
+                    </select>
+                </div>
+                <div class="col-md-3">
                     <label class="form-label">Diagnosis Head</label>
                     <select class="form-control select2" id="diagnosis_id" name="diagnosis_id" multiple data-placeholder="Select Diagnosis">
                         <option value="0">All Diagnosis</option>
@@ -86,6 +96,7 @@ $itemTypes = $item_types ?? [];
             var dateRange = startVal + 'S' + endVal;
 
             var invoiceType = document.getElementById('invoice_type').value || '0';
+            var referDoctorId = document.getElementById('refer_doctor_id').value || '0';
 
             var diagnosisSelect = document.getElementById('diagnosis_id');
             var diagnosisValues = Array.prototype.filter.call(diagnosisSelect.options, function(option) {
@@ -97,7 +108,8 @@ $itemTypes = $item_types ?? [];
             var diagnosisList = diagnosisValues.length ? diagnosisValues.join('S') : '0';
 
             return '<?= base_url('Report/diagnosis_report_data') ?>/' 
-                + encodeURIComponent(dateRange) + '/' + invoiceType + '/' + diagnosisList;
+                + encodeURIComponent(dateRange) + '/' + invoiceType + '/' + diagnosisList
+                + '?refer_doctor_id=' + encodeURIComponent(referDoctorId);
         }
 
         document.getElementById('show_report').addEventListener('click', function() {
diff --git a/app/Views/report/diagnosis_report_table.php b/app/Views/report/diagnosis_report_table.php
index 4e94514..e0fcafc 100644
--- a/app/Views/report/diagnosis_report_table.php
+++ b/app/Views/report/diagnosis_report_table.php
@@ -3,6 +3,7 @@ $rows = $rows ?? [];
 $minRange = $min_range ?? '';
 $maxRange = $max_range ?? '';
 $invoiceTypeLabel = $invoice_type_label ?? 'All Types';
+$referDoctorLabel = $refer_doctor_label ?? 'All Refer Doctors';
 
 $formatIndianDateTime = static function ($value): string {
     $value = trim((string) $value);
@@ -25,6 +26,7 @@ $maxRangeDisplay = $formatIndianDateTime($maxRange);
 <div class="mb-3">
     <p><strong>Date Range:</strong> <?= esc($minRangeDisplay) ?> to <?= esc($maxRangeDisplay) ?></p>
     <p><strong>Invoice Type:</strong> <?= esc($invoiceTypeLabel) ?></p>
+    <p><strong>Refer Doctor:</strong> <?= esc($referDoctorLabel) ?></p>
 </div>
 
 <?php if (empty($rows)) : ?>