diff --git a/backend/app.py b/backend/app.py
index 1d67a33..6d9815d 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -1858,10 +1858,13 @@ def admin():
     recent_users = []
 
     # MSSQL 세션 (조제 이력 확인용)
+    base_session = None
+    pres_session = None
     try:
-        mssql_session = db_manager.get_session('PM_PRES')
+        base_session = db_manager.get_session('PM_BASE')
+        pres_session = db_manager.get_session('PM_PRES')
     except:
-        mssql_session = None
+        pass
 
     for user in recent_users_raw:
         user_dict = dict(user)
@@ -1870,19 +1873,29 @@ def admin():
 
         # 조제 이력 확인 (MSSQL)
         user_dict['has_prescription'] = False
-        if mssql_session and user['phone']:
+        if base_session and pres_session and user['phone']:
             try:
                 phone_clean = user['phone'].replace('-', '').replace(' ', '')
-                pres_check = mssql_session.execute(text("""
-                    SELECT TOP 1 p.CusCode
-                    FROM PM_BASE.dbo.CD_PERSON p
-                    INNER JOIN PS_main ps ON p.CUSCODE = ps.CusCode
-                    WHERE REPLACE(REPLACE(p.PHONE, '-', ''), ' ', '') = :phone
-                       OR REPLACE(REPLACE(p.PHONE2, '-', ''), ' ', '') = :phone
-                       OR REPLACE(REPLACE(p.TEL_NO, '-', ''), ' ', '') = :phone
-                """), {'phone': phone_clean}).fetchone()
-                if pres_check:
-                    user_dict['has_prescription'] = True
+                
+                # 1단계: PM_BASE에서 전화번호로 CUSCODE 조회
+                cuscode_query = text("""
+                    SELECT TOP 1 CUSCODE
+                    FROM CD_PERSON
+                    WHERE REPLACE(REPLACE(PHONE, '-', ''), ' ', '') = :phone
+                       OR REPLACE(REPLACE(TEL_NO, '-', ''), ' ', '') = :phone
+                       OR REPLACE(REPLACE(PHONE2, '-', ''), ' ', '') = :phone
+                """)
+                cus_row = base_session.execute(cuscode_query, {'phone': phone_clean}).fetchone()
+                
+                if cus_row:
+                    # 2단계: PM_PRES에서 CUSCODE로 조제 기록 확인
+                    pres_check = pres_session.execute(text("""
+                        SELECT TOP 1 PreSerial FROM PS_main WHERE CusCode = :cuscode
+                    """), {'cuscode': cus_row.CUSCODE}).fetchone()
+                    
+                    if pres_check:
+                        user_dict['has_prescription'] = True
+                        
             except Exception as e:
                 logging.warning(f"조제 이력 확인 실패 (user {user['id']}): {e}")