diff --git a/backend/app.py b/backend/app.py
index 670404d..31cc21a 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -4152,25 +4152,23 @@ def api_kims_interaction_check():
                 'error': '상호작용 체크를 위해 최소 2개 이상의 약품이 필요합니다.'
             }), 400
         
-        # 1. DrugCode → BASECODE(KIMS 9자리) 변환
-        # CD_BARCODE.BASECODE가 KIMS KD코드 (9자리)
+        # 1. DrugCode = KIMS KD코드 (9자리) - 직접 사용
         drug_session = db_manager.get_session('PM_DRUG')
         placeholders = ','.join([f"'{c}'" for c in drug_codes])
         
         code_query = text(f"""
-            SELECT G.DrugCode, G.GoodsName, 
-                   (SELECT TOP 1 BASECODE FROM CD_BARCODE WHERE DrugCode = G.DrugCode AND BASECODE IS NOT NULL) as BASECODE
-            FROM CD_GOODS G
-            WHERE G.DrugCode IN ({placeholders})
+            SELECT DrugCode, GoodsName
+            FROM CD_GOODS
+            WHERE DrugCode IN ({placeholders})
         """)
         code_result = drug_session.execute(code_query).fetchall()
         
-        # KIMS 코드 매핑
+        # DrugCode를 KIMS KD코드로 직접 사용
         kd_codes = []
         drugs_info = []
         for row in code_result:
-            kd_code = row.BASECODE
-            if kd_code:
+            kd_code = row.DrugCode  # DrugCode 자체가 KIMS 코드
+            if kd_code and len(str(kd_code)) == 9:
                 kd_codes.append(str(kd_code))
                 drugs_info.append({
                     'drug_code': row.DrugCode,