diff --git a/litellm/proxy/common_request_processing.py b/litellm/proxy/common_request_processing.py
index 7e1989b0aab..cbcd13d2ba3 100644
--- a/litellm/proxy/common_request_processing.py
+++ b/litellm/proxy/common_request_processing.py
@@ -754,6 +754,12 @@ async def _parse_event_data_for_error(event_line: str | bytes) -> int | None:
                 # Ensure error_code is a valid HTTP status code
                 if error_code is not None and 100 <= error_code <= 599:
                     return error_code
+                elif error_code is not None:
+                    verbose_proxy_logger.warning(
+                        "Error code is outside the HTTP status range; mapping to 502: %s",
+                        error_code,
+                    )
+                    return status.HTTP_502_BAD_GATEWAY
                 elif error_code_raw is not None:  # Log if original code was present but not valid
                     verbose_proxy_logger.warning("Error has invalid or non-convertible code: %s", error_code_raw)
         except (orjson.JSONDecodeError, json.JSONDecodeError):
diff --git a/tests/test_litellm/proxy/test_common_request_processing.py b/tests/test_litellm/proxy/test_common_request_processing.py
index 7b74e69685c..f2bf327b841 100644
--- a/tests/test_litellm/proxy/test_common_request_processing.py
+++ b/tests/test_litellm/proxy/test_common_request_processing.py
@@ -2066,11 +2066,11 @@ class TestCommonRequestProcessingHelpers:
             ),  # Invalid string code
             (
                 'data: {"error": {"code": 99, "message": "too low"}}',
-                None,
+                502,
             ),  # Integer code too low
             (
                 'data: {"error": {"code": 600, "message": "too high"}}',
-                None,
+                502,
             ),  # Integer code too high
             (
                 'data: {"id": "123", "content": "hello"}',
diff --git a/tests/test_litellm/test_sse_vendor_error_codes.py b/tests/test_litellm/test_sse_vendor_error_codes.py
new file mode 100644
index 00000000000..0e9985c4419
--- /dev/null
+++ b/tests/test_litellm/test_sse_vendor_error_codes.py
@@ -0,0 +1,38 @@
+import pytest
+
+from litellm.proxy.common_request_processing import _parse_event_data_for_error
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("code", "expected"),
+    [
+        (0, 502),
+        (99, 502),
+        (100, 100),
+        (400, 400),
+        (599, 599),
+        (600, 502),
+        (1302, 502),
+        ("4001", 502),
+    ],
+)
+async def test_parse_event_maps_numeric_vendor_error_codes(code, expected):
+    event = f'data: {{"error": {{"code": {code!r}, "message": "provider error"}}}}'
+    if isinstance(code, str):
+        event = event.replace("'", '"')
+
+    assert await _parse_event_data_for_error(event) == expected
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "event",
+    [
+        'data: {"error": {"code": "not-a-number"}}',
+        'data: {"error": {"message": "missing code"}}',
+        "data: [DONE]",
+    ],
+)
+async def test_parse_event_ignores_missing_or_non_numeric_error_codes(event):
+    assert await _parse_event_data_for_error(event) is None