diff --git a/backend/streetdrop-api/src/main/java/com/depromeet/common/error/dto/CommonErrorCode.java b/backend/streetdrop-api/src/main/java/com/depromeet/common/error/dto/CommonErrorCode.java
index 50475d92..c7b5c4ca 100644
--- a/backend/streetdrop-api/src/main/java/com/depromeet/common/error/dto/CommonErrorCode.java
+++ b/backend/streetdrop-api/src/main/java/com/depromeet/common/error/dto/CommonErrorCode.java
@@ -29,7 +29,7 @@ public enum CommonErrorCode implements ErrorCodeInterface {
 	 * Basic Server Error
 	 */
 	INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "COMMON_INTERNAL_SERVER_ERROR", "Internal Server Error", "An unexpected error occurred"),
-	NOT_IMPLEMENTED(HttpStatus.NOT_IMPLEMENTED, "COMMON_INTERNAL_SERVER_ERROR", "Not Implemented", "The server does not support the functionality required to fulfill the request.");
+	NOT_IMPLEMENTED(HttpStatus.NOT_IMPLEMENTED, "COMMON_NOT_IMPLEMENTED", "Not Implemented", "The server does not support the functionality required to fulfill the request.");
 
 
 	private final HttpStatus status;
diff --git a/backend/streetdrop-api/src/main/java/com/depromeet/domains/user/error/UserErrorCode.java b/backend/streetdrop-api/src/main/java/com/depromeet/domains/user/error/UserErrorCode.java
index de1b5faf..e7a28097 100644
--- a/backend/streetdrop-api/src/main/java/com/depromeet/domains/user/error/UserErrorCode.java
+++ b/backend/streetdrop-api/src/main/java/com/depromeet/domains/user/error/UserErrorCode.java
@@ -11,7 +11,7 @@
 public enum UserErrorCode implements ErrorCodeInterface {
     USER_NOT_FOUND(HttpStatus.NOT_FOUND, "USER_NOT_FOUND", "User Not Found", "User with the corresponding id could not be found"),
     INVALID_USER_EXCEPTION(HttpStatus.FORBIDDEN, "USER_FORBIDDEN", "User does not have permission", "Modify or Delete Not Permitted"),
-    INVALID_INPUT_EXCEPTION(HttpStatus.BAD_REQUEST, "USER_NOT_FOUND", "C-0015", "Nickname must be at least 1 character and not more than 10 characters"),
+    USER_NICKNAME_INVALID(HttpStatus.BAD_REQUEST, "USER_NICKNAME_INVALID", "User nickname is invalid", "Nickname must be at least 1 character and not more than 10 characters"),
     USER_CAN_NOT_BLOCK_SELF(HttpStatus.BAD_REQUEST, "USER_CAN_NOT_BLOCK_SELF", "Can Not Block Myself", "You can't block yourself");
 
     private final HttpStatus status;
diff --git a/backend/streetdrop-api/src/test/java/unit/common/error/StreetDropErrorCodeTest.java b/backend/streetdrop-api/src/test/java/unit/common/error/StreetDropErrorCodeTest.java
new file mode 100644
index 00000000..a0a3c351
--- /dev/null
+++ b/backend/streetdrop-api/src/test/java/unit/common/error/StreetDropErrorCodeTest.java
@@ -0,0 +1,34 @@
+package unit.common.error;
+
+import com.depromeet.common.error.dto.StreetDropErrorCode;
+import com.depromeet.common.error.dto.StreetDropErrorCodeList;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+@DisplayName("에러 코드 테스트")
+public class StreetDropErrorCodeTest {
+    @Test
+    @DisplayName("다른 도메인의 에러 코드가 중복되지 않는지 테스트")
+    public void testNoDuplicateErrorResponseCodes() {
+
+        StreetDropErrorCodeList streetDropErrorCodeList = StreetDropErrorCodeList.getInstance();
+        List<StreetDropErrorCode> errorCodes = streetDropErrorCodeList.getStreetDropErrorCodeList();
+
+        List<String> errorResponseCodes = errorCodes.stream()
+                .map(StreetDropErrorCode::getErrorResponseCode)
+                .toList();
+
+        var duplicatedList = errorResponseCodes.stream()
+                .filter(i -> errorResponseCodes.stream().filter(i::equals).count() > 1)
+                .distinct()
+                .toList();
+
+        assertTrue(duplicatedList.isEmpty(), "There are duplicated error response codes: " + duplicatedList);
+    }
+
+}