diff --git a/app.py b/app.py
index 8a5d833..d9f087a 100644
--- a/app.py
+++ b/app.py
@@ -110,6 +110,26 @@ def get_patient(patient_id):
     except Exception as e:
         return jsonify({'success': False, 'error': str(e)}), 500
 
+@app.route('/api/patients/search', methods=['GET'])
+def search_patients():
+    """환자 검색 (이름으로)"""
+    try:
+        name = request.args.get('name', '')
+
+        with get_db() as conn:
+            cursor = conn.cursor()
+            cursor.execute("""
+                SELECT patient_id, name, phone, gender, birth_date, notes,
+                       mileage_balance, total_mileage_earned, total_mileage_used
+                FROM patients
+                WHERE name LIKE ? AND is_active = 1
+                ORDER BY name
+            """, (f'%{name}%',))
+            patients = [dict(row) for row in cursor.fetchall()]
+            return jsonify({'success': True, 'data': patients})
+    except Exception as e:
+        return jsonify({'success': False, 'error': str(e)}), 500
+
 @app.route('/api/patients', methods=['POST'])
 def create_patient():
     """새 환자 등록"""
diff --git a/static/app.js b/static/app.js
index e1da7e4..228fff7 100644
--- a/static/app.js
+++ b/static/app.js
@@ -1380,6 +1380,7 @@ $(document).ready(function() {
                                     <button class="btn btn-sm btn-outline-success process-sale" data-id="${compound.compound_id}"
                                             data-formula="${compound.formula_name || '직접조제'}"
                                             data-patient="${compound.patient_name || '직접조제'}"
+                                            data-patient-id="${compound.patient_id || ''}"
                                             data-cost="${compound.cost_total || 0}"
                                             data-price="${compound.sell_price_total || 0}">
                                         <i class="bi bi-cash-coin"></i> 판매
@@ -1411,10 +1412,11 @@ $(document).ready(function() {
                     const compoundId = $(this).data('id');
                     const formulaName = $(this).data('formula');
                     const patientName = $(this).data('patient');
+                    const patientId = $(this).data('patient-id');
                     const costTotal = $(this).data('cost');
                     const priceTotal = $(this).data('price');
 
-                    openSalesModal(compoundId, formulaName, patientName, costTotal, priceTotal);
+                    openSalesModal(compoundId, formulaName, patientName, patientId, costTotal, priceTotal);
                 });
 
                 // 배송 처리 버튼 이벤트
@@ -3553,14 +3555,14 @@ $(document).ready(function() {
     // ==================== 판매 관리 기능 ====================
 
     // 판매 모달 열기
-    function openSalesModal(compoundId, formulaName, patientName, costTotal, priceTotal) {
+    function openSalesModal(compoundId, formulaName, patientName, patientId, costTotal, priceTotal) {
         $('#salesCompoundId').val(compoundId);
         $('#salesFormulaName').val(formulaName);
         $('#salesPatientName').val(patientName);
         $('#salesCostTotal').val(costTotal);
 
-        // 환자 마일리지 조회
-        loadPatientMileage(patientName);
+        // 환자 마일리지 조회 (patient_id로 직접 조회)
+        loadPatientMileage(patientId);
 
         // 기본 가격 계산 (원가 + 조제료)
         const dispensingFee = parseFloat($('#salesDispensingFee').val()) || 20000;
@@ -3598,11 +3600,12 @@ $(document).ready(function() {
     }
 
     // 환자 마일리지 조회
-    function loadPatientMileage(patientName) {
-        if (patientName && patientName !== '직접조제') {
-            $.get('/api/patients/search', { name: patientName }, function(response) {
-                if (response.success && response.data.length > 0) {
-                    const patient = response.data[0];
+    function loadPatientMileage(patientId) {
+        if (patientId) {
+            // patient_id로 직접 조회
+            $.get(`/api/patients/${patientId}`, function(response) {
+                if (response.success && response.data) {
+                    const patient = response.data;
                     const mileage = patient.mileage_balance || 0;
                     $('#patientMileageBalance').text(mileage.toLocaleString());
                     $('#salesMileageUse').attr('max', mileage);
@@ -3610,8 +3613,13 @@ $(document).ready(function() {
                     $('#patientMileageBalance').text('0');
                     $('#salesMileageUse').attr('max', 0);
                 }
+            }).fail(function() {
+                console.error('Failed to load patient mileage');
+                $('#patientMileageBalance').text('0');
+                $('#salesMileageUse').attr('max', 0);
             });
         } else {
+            // 직접조제인 경우
             $('#patientMileageBalance').text('0');
             $('#salesMileageUse').attr('max', 0);
         }