diff --git a/litellm/proxy/health_endpoints/_health_endpoints.py b/litellm/proxy/health_endpoints/_health_endpoints.py
index 00f0ef1756f..4ce4be01bda 100644
--- a/litellm/proxy/health_endpoints/_health_endpoints.py
+++ b/litellm/proxy/health_endpoints/_health_endpoints.py
@@ -730,6 +730,31 @@ def _build_model_param_to_info_mapping(model_list: list) -> dict:
     return model_param_to_info
 
 
+def _get_model_infos_for_endpoint(
+    model_param_to_info: Mapping[str, list[Mapping[str, Any]]],
+    endpoint: Mapping[str, Any],
+) -> list[Mapping[str, Any]]:
+    """
+    Return the model infos a health check endpoint result belongs to.
+
+    ``model_param_to_info`` is keyed by ``litellm_params.model``, which is not
+    unique: several deployments (different ``api_base``, or model-group aliases)
+    can share it. Each endpoint result carries the ``model_id`` of the
+    deployment it was produced for, so prefer an exact match on that. When an
+    id is present but matches nothing locally, the result is for a deployment
+    this proxy does not know about, so return an empty list instead of falling
+    back to the broad model-name match (which would reintroduce the original
+    cross-attribution bug). Fall back to the model-param mapping only when no
+    id is available at all.
+    """
+    model_infos = model_param_to_info.get(endpoint.get("model"), [])
+    endpoint_model_id = endpoint.get("model_id")
+    if endpoint_model_id:
+        matching = [info for info in model_infos if info.get("model_id") == endpoint_model_id]
+        return matching
+    return model_infos
+
+
 def _aggregate_health_check_results(
     model_param_to_info: dict,
     healthy_endpoints: list,
@@ -754,7 +779,7 @@ def _aggregate_health_check_results(
     for endpoint in healthy_endpoints:
         model_param = endpoint.get("model")
         if model_param and model_param in model_param_to_info:
-            for model_info in model_param_to_info[model_param]:
+            for model_info in _get_model_infos_for_endpoint(model_param_to_info, endpoint):
                 key = (model_info["model_id"], model_info["model_name"])
                 if key not in model_results:
                     model_results[key] = {
@@ -771,7 +796,7 @@ def _aggregate_health_check_results(
         model_param = endpoint.get("model")
         error_message = endpoint.get("error")
         if model_param and model_param in model_param_to_info:
-            for model_info in model_param_to_info[model_param]:
+            for model_info in _get_model_infos_for_endpoint(model_param_to_info, endpoint):
                 key = (model_info["model_id"], model_info["model_name"])
                 if key not in model_results:
                     model_results[key] = {