diff --git a/crates/ruff_db/src/diagnostic/mod.rs b/crates/ruff_db/src/diagnostic/mod.rs
index 33348ddf2e..cf1114b11f 100644
--- a/crates/ruff_db/src/diagnostic/mod.rs
+++ b/crates/ruff_db/src/diagnostic/mod.rs
@@ -888,6 +888,10 @@ impl Annotation {
     pub fn hide_snippet(&mut self, yes: bool) {
         self.hide_snippet = yes;
     }
+
+    pub fn is_primary(&self) -> bool {
+        self.is_primary
+    }
 }
 
 /// Tags that can be associated with an annotation.
diff --git a/crates/ty_server/src/server/api/diagnostics.rs b/crates/ty_server/src/server/api/diagnostics.rs
index d25e6f5243..3344738cbf 100644
--- a/crates/ty_server/src/server/api/diagnostics.rs
+++ b/crates/ty_server/src/server/api/diagnostics.rs
@@ -349,6 +349,7 @@ pub(super) fn to_lsp_diagnostic(
             sub_diagnostic
                 .annotations()
                 .iter()
+                .filter(|annotation| !annotation.is_primary())
                 .filter_map(|annotation| {
                     annotation_to_related_information(db, annotation, encoding)
                 }),