diff --git a/.changeset/selfish-planes-give.md b/.changeset/selfish-planes-give.md
new file mode 100644
index 00000000000..a845151cc84
--- /dev/null
+++ b/.changeset/selfish-planes-give.md
@@ -0,0 +1,2 @@
+---
+---
diff --git a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/EnumGenerator.java b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/EnumGenerator.java
index d6fdcb34a74..59a5eba7070 100644
--- a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/EnumGenerator.java
+++ b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/EnumGenerator.java
@@ -49,7 +49,7 @@
  * import { TypedYesNo } from "./TypedYesNo";
  *
  * interface MyStructure {
- *   "yesNo": TypedYesNo | string;
+ *   "yesNo": TypedYesNo;
  * }
  * }</pre>
  */
diff --git a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/IntEnumGenerator.java b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/IntEnumGenerator.java
index 19b7bed2e85..1a1a5262c89 100644
--- a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/IntEnumGenerator.java
+++ b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/IntEnumGenerator.java
@@ -51,7 +51,7 @@
  * import { FaceCard } from "./FaceCard";
  *
  * interface MyStructure {
- *   "facecard": FaceCard | number;
+ *   "facecard": FaceCard;
  * }
  * }</pre>
  */
diff --git a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/SymbolVisitor.java b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/SymbolVisitor.java
index 6efd9c0f2c8..d8f940c8943 100644
--- a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/SymbolVisitor.java
+++ b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/SymbolVisitor.java
@@ -353,11 +353,7 @@ public Symbol memberShape(MemberShape shape) {
                 .orElseThrow(() -> new CodegenException("Shape not found: " + shape.getTarget()));
         Symbol targetSymbol = toSymbol(targetShape);
 
-        if (targetShape.isIntEnumShape()) {
-            return createMemberSymbolWithIntEnumTarget(targetSymbol);
-        }
-
-        if (targetSymbol.getProperties().containsKey(EnumTrait.class.getName())) {
+        if (targetSymbol.getProperties().containsKey(EnumTrait.class.getName()) || targetShape.isIntEnumShape()) {
             return createMemberSymbolWithEnumTarget(targetSymbol);
         }
 
@@ -371,24 +367,15 @@ public Symbol memberShape(MemberShape shape) {
         return targetSymbol;
     }
 
-    // Enums are considered "open", meaning it is a backward compatible change to add new
-    // members. Adding the `string` variant allows for previously generated clients to be
-    // able to handle unknown enum values that may be added in the future.
+    // Enums were considered "open" with the union `| string` or `| number`, meaning it was a backwards
+    // compatible change to add new members. This behavior was later removed to improve the helpfulness
+    // of closed enumerated union types.
+    // For overrides, users should use available type system overrides such as "as any" or
+    // pragma comments.
     private Symbol createMemberSymbolWithEnumTarget(Symbol targetSymbol) {
         return targetSymbol.toBuilder()
                 .namespace(null, "/")
-                .name(targetSymbol.getName() + " | string")
-                .addReference(targetSymbol)
-                .build();
-    }
-
-    // IntEnums are considered "open", meaning it is a backward compatible change to add new
-    // members. Adding the `number` variant allows for previously generated clients to be
-    // able to handle unknown int enum values that may be added in the future.
-    private Symbol createMemberSymbolWithIntEnumTarget(Symbol targetSymbol) {
-        return targetSymbol.toBuilder()
-                .namespace(null, "/")
-                .name(targetSymbol.getName() + " | number")
+                .name(targetSymbol.getName())
                 .addReference(targetSymbol)
                 .build();
     }
diff --git a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptUtils.java b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptUtils.java
index ac5c76451b1..c3cf7b089dc 100644
--- a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptUtils.java
+++ b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptUtils.java
@@ -66,7 +66,7 @@ private static boolean isValidPropertyName(String value) {
     /**
      * Creates a list of sorted, pipe separated enum variants as a union.
      *
-     * <p>For example, `"foo" | "baz" | string`. Note: special characters
+     * <p>For example, `"foo" | "baz"`. Note: special characters
      * and quotes are escaped as needed.
      *
      * @param values Values to create into a union.
diff --git a/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/SymbolProviderTest.java b/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/SymbolProviderTest.java
index f8555889ce8..e3b0ef404ed 100644
--- a/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/SymbolProviderTest.java
+++ b/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/SymbolProviderTest.java
@@ -194,7 +194,7 @@ public void usesLazyJsonStringForJsonMediaType() {
     }
 
     @Test
-    public void addsUnknownStringEnumVariant() {
+    public void omitsUnknownStringEnumVariant() {
         EnumTrait trait = EnumTrait.builder()
                 .addEnum(EnumDefinition.builder().value("FOO").name("FOO").build())
                 .addEnum(EnumDefinition.builder().value("BAR").name("BAR").build())
@@ -218,11 +218,11 @@ public void addsUnknownStringEnumVariant() {
         SymbolProvider provider = new SymbolVisitor(model, settings);
         Symbol memberSymbol = provider.toSymbol(member);
 
-        assertThat(memberSymbol.getName(), equalTo("EnumString | string"));
+        assertThat(memberSymbol.getName(), equalTo("EnumString"));
     }
 
     @Test
-    public void addsUnknownNumberIntEnumVariant() {
+    public void omitsUnknownNumberIntEnumVariant() {
         IntEnumShape shape = IntEnumShape.builder()
                 .id("com.foo#Foo")
                 .addMember("BAR", 2)
@@ -246,7 +246,7 @@ public void addsUnknownNumberIntEnumVariant() {
         SymbolProvider provider = new SymbolVisitor(model, settings);
         Symbol memberSymbol = provider.toSymbol(member);
 
-        assertThat(memberSymbol.getName(), equalTo("Foo | number"));
+        assertThat(memberSymbol.getName(), equalTo("Foo"));
     }
 
 }