diff --git a/src/VisualStudio/CSharp/Impl/CodeModel/CSharpCodeModelService.cs b/src/VisualStudio/CSharp/Impl/CodeModel/CSharpCodeModelService.cs
index b2d1b0ee10c1314db471c97bed2c5400bd53dda4..7b2cb470f6ef943d9ef21f6ebea3f3448352d41a 100644
--- a/src/VisualStudio/CSharp/Impl/CodeModel/CSharpCodeModelService.cs
+++ b/src/VisualStudio/CSharp/Impl/CodeModel/CSharpCodeModelService.cs
@@ -58,14 +58,16 @@ internal partial class CSharpCodeModelService : AbstractCodeModelService
 
         private static readonly SymbolDisplayFormat s_externalNameFormat =
             new SymbolDisplayFormat(
-                miscellaneousOptions: SymbolDisplayMiscellaneousOptions.EscapeKeywordIdentifiers);
+                miscellaneousOptions: SymbolDisplayMiscellaneousOptions.EscapeKeywordIdentifiers,
+                parameterOptions: SymbolDisplayParameterOptions.IncludeName);
 
         private static readonly SymbolDisplayFormat s_externalFullNameFormat =
             new SymbolDisplayFormat(
                 typeQualificationStyle: SymbolDisplayTypeQualificationStyle.NameAndContainingTypesAndNamespaces,
                 memberOptions: SymbolDisplayMemberOptions.IncludeContainingType | SymbolDisplayMemberOptions.IncludeExplicitInterface,
                 genericsOptions: SymbolDisplayGenericsOptions.IncludeTypeParameters,
-                miscellaneousOptions: SymbolDisplayMiscellaneousOptions.EscapeKeywordIdentifiers);
+                miscellaneousOptions: SymbolDisplayMiscellaneousOptions.EscapeKeywordIdentifiers,
+                parameterOptions: SymbolDisplayParameterOptions.IncludeName);
 
         private static readonly SymbolDisplayFormat s_setTypeFormat =
             new SymbolDisplayFormat(
diff --git a/src/VisualStudio/Core/Impl/CodeModel/ExternalElements/ExternalCodeParameter.cs b/src/VisualStudio/Core/Impl/CodeModel/ExternalElements/ExternalCodeParameter.cs
index 09b1ce5ca9fa0865c6273dacd2dddbc3ba1f04df..65a929554379948746895b991732ac2910387ec2 100644
--- a/src/VisualStudio/Core/Impl/CodeModel/ExternalElements/ExternalCodeParameter.cs
+++ b/src/VisualStudio/Core/Impl/CodeModel/ExternalElements/ExternalCodeParameter.cs
@@ -2,7 +2,6 @@
 
 using System.Runtime.InteropServices;
 using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.Text;
 using Microsoft.VisualStudio.LanguageServices.Implementation.Interop;
 using Microsoft.VisualStudio.LanguageServices.Implementation.Utilities;
 
diff --git a/src/VisualStudio/Core/Test/CodeModel/AbstractCodeParameterTests.vb b/src/VisualStudio/Core/Test/CodeModel/AbstractCodeParameterTests.vb
index 181ae85288e34c4045d04be083b2c6b6fccbbe1c..356b428af6f1a65039bfd438cc44913ec72e2838 100644
--- a/src/VisualStudio/Core/Test/CodeModel/AbstractCodeParameterTests.vb
+++ b/src/VisualStudio/Core/Test/CodeModel/AbstractCodeParameterTests.vb
@@ -2,7 +2,6 @@
 
 Imports EnvDTE
 Imports EnvDTE80
-Imports Microsoft.CodeAnalysis.Editor.UnitTests.Extensions
 
 Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.CodeModel
     Public MustInherit Class AbstractCodeParameterTests
diff --git a/src/VisualStudio/Core/Test/CodeModel/CSharp/CodeParameterTests.vb b/src/VisualStudio/Core/Test/CodeModel/CSharp/CodeParameterTests.vb
index 8a1cccdd0c8cbc4cff4ce477e41f04b2045dff3a..2e05f341645f4a0116ec0e1f1fd4d60cfe37e701 100644
--- a/src/VisualStudio/Core/Test/CodeModel/CSharp/CodeParameterTests.vb
+++ b/src/VisualStudio/Core/Test/CodeModel/CSharp/CodeParameterTests.vb
@@ -102,6 +102,55 @@ class C : System.Console
 
 #End Region
 
+#Region "Name tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName1() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName2() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(ref string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName3() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(out string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "s")
+        End Function
+
+#End Region
+
 #Region "FullName tests"
 
         <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
@@ -114,6 +163,36 @@ class C
     {
     }
 }
+</Code>
+
+            Await TestFullName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName2() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(ref string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestFullName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName3() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(out string $$s)
+    {
+    }
+}
 </Code>
 
             Await TestFullName(code, "s")
diff --git a/src/VisualStudio/Core/Test/CodeModel/CSharp/ExternalCodeFunctionTests.vb b/src/VisualStudio/Core/Test/CodeModel/CSharp/ExternalCodeFunctionTests.vb
new file mode 100644
index 0000000000000000000000000000000000000000..bf08a7a47eb28654dd6028f4ba9f39e7d822ea7c
--- /dev/null
+++ b/src/VisualStudio/Core/Test/CodeModel/CSharp/ExternalCodeFunctionTests.vb
@@ -0,0 +1,51 @@
+Imports System.Threading.Tasks
+Imports Microsoft.CodeAnalysis
+Imports Roslyn.Test.Utilities
+
+Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.CodeModel.CSharp
+    Public Class ExternalCodeFunctionTests
+        Inherits AbstractCodeFunctionTests
+
+#Region "FullName tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName1() As Task
+            Dim code =
+<Code>
+class C
+{
+    void $$Foo(string s)
+    {
+    }
+}
+</Code>
+
+            Await TestFullName(code, "C.Foo")
+        End Function
+
+#End Region
+
+#Region "Name tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName1() As Task
+            Dim code =
+<Code>
+class C
+{
+    void $$Foo(string s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "Foo")
+        End Function
+
+#End Region
+
+        Protected Overrides ReadOnly Property LanguageName As String = LanguageNames.CSharp
+        Protected Overrides ReadOnly Property TargetExternalCodeElements As Boolean = True
+
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/src/VisualStudio/Core/Test/CodeModel/CSharp/ExternalCodeParameterTests.vb b/src/VisualStudio/Core/Test/CodeModel/CSharp/ExternalCodeParameterTests.vb
new file mode 100644
index 0000000000000000000000000000000000000000..cb3e0cd161504a2513ff682fc825f336e2e57509
--- /dev/null
+++ b/src/VisualStudio/Core/Test/CodeModel/CSharp/ExternalCodeParameterTests.vb
@@ -0,0 +1,113 @@
+' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+Imports System.Threading.Tasks
+Imports Microsoft.CodeAnalysis
+Imports Roslyn.Test.Utilities
+
+Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.CodeModel.CSharp
+    Public Class ExternalCodeParameterTests
+        Inherits AbstractCodeParameterTests
+
+#Region "FullName tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName1() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestFullName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName2() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(ref string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestFullName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName3() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(out string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestFullName(code, "s")
+        End Function
+
+#End Region
+
+#Region "Name tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName1() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName2() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(ref string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "s")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName3() As Task
+            Dim code =
+<Code>
+class C
+{
+    void Foo(out string $$s)
+    {
+    }
+}
+</Code>
+
+            Await TestName(code, "s")
+        End Function
+
+#End Region
+
+        Protected Overrides ReadOnly Property LanguageName As String = LanguageNames.CSharp
+        Protected Overrides ReadOnly Property TargetExternalCodeElements As Boolean = True
+
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/src/VisualStudio/Core/Test/CodeModel/CodeModelTestHelpers.vb b/src/VisualStudio/Core/Test/CodeModel/CodeModelTestHelpers.vb
index 11f5a0df164fe3582f3f723ff1511162dea4d25c..715185024fec54a436b0726f9e68b2c4652ea271 100644
--- a/src/VisualStudio/Core/Test/CodeModel/CodeModelTestHelpers.vb
+++ b/src/VisualStudio/Core/Test/CodeModel/CodeModelTestHelpers.vb
@@ -8,6 +8,7 @@ Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspaces
 Imports Microsoft.CodeAnalysis.Test.Utilities
 Imports Microsoft.VisualStudio.ComponentModelHost
 Imports Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel
+Imports Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.ExternalElements
 Imports Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.InternalElements
 Imports Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.Interop
 Imports Microsoft.VisualStudio.LanguageServices.Implementation.Interop
@@ -173,6 +174,14 @@ Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.CodeModel
             Assert.True(codeElement IsNot Nothing, "Expected code element")
             Assert.True(codeElement.InfoLocation = EnvDTE.vsCMInfoLocation.vsCMInfoLocationProject, "Expected internal code element")
 
+            If TypeOf codeElement Is EnvDTE.CodeParameter Then
+                Dim codeParameter = DirectCast(codeElement, EnvDTE.CodeParameter)
+                Dim externalParentCodeElement = codeParameter.Parent.AsExternal()
+                Dim externalParentCodeElementImpl = ComAggregate.GetManagedObject(Of AbstractExternalCodeMember)(externalParentCodeElement)
+
+                Return DirectCast(externalParentCodeElementImpl.Parameters.Item(codeParameter.Name), T)
+            End If
+
             Dim codeElementImpl = ComAggregate.GetManagedObject(Of AbstractCodeElement)(codeElement)
             Dim state = codeElementImpl.State
             Dim projectId = codeElementImpl.FileCodeModel.GetProjectId()
diff --git a/src/VisualStudio/Core/Test/CodeModel/VisualBasic/ExternalCodeFunctionTests.vb b/src/VisualStudio/Core/Test/CodeModel/VisualBasic/ExternalCodeFunctionTests.vb
new file mode 100644
index 0000000000000000000000000000000000000000..b70fffa32667a8f88ab21d641598fed7df4f7c12
--- /dev/null
+++ b/src/VisualStudio/Core/Test/CodeModel/VisualBasic/ExternalCodeFunctionTests.vb
@@ -0,0 +1,47 @@
+Imports System.Threading.Tasks
+Imports Microsoft.CodeAnalysis
+Imports Roslyn.Test.Utilities
+
+Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.CodeModel.CSharp.VisualBasic
+    Public Class ExternalCodeFunctionTests
+        Inherits AbstractCodeFunctionTests
+
+#Region "FullName tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName1() As Task
+            Dim code =
+<Code>
+Class C
+    Sub $$Foo(string s)
+    End Sub
+End Class
+</Code>
+
+            Await TestFullName(code, "C.Foo")
+        End Function
+
+#End Region
+
+#Region "Name tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName1() As Task
+            Dim code =
+<Code>
+Class C
+    Sub $$Foo(string s)
+    End Sub
+End Class
+</Code>
+
+            Await TestName(code, "Foo")
+        End Function
+
+#End Region
+
+        Protected Overrides ReadOnly Property LanguageName As String = LanguageNames.VisualBasic
+        Protected Overrides ReadOnly Property TargetExternalCodeElements As Boolean = True
+
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/src/VisualStudio/Core/Test/CodeModel/VisualBasic/ExternalCodeParameterTests.vb b/src/VisualStudio/Core/Test/CodeModel/VisualBasic/ExternalCodeParameterTests.vb
new file mode 100644
index 0000000000000000000000000000000000000000..7956bd8bb8d8dc609ba8bcdd08c7e61a02c04418
--- /dev/null
+++ b/src/VisualStudio/Core/Test/CodeModel/VisualBasic/ExternalCodeParameterTests.vb
@@ -0,0 +1,125 @@
+' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+Imports System.Threading.Tasks
+Imports Microsoft.CodeAnalysis
+Imports Roslyn.Test.Utilities
+
+Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.CodeModel.VisualBasic
+    Public Class ExternalCodeParameterTests
+        Inherits AbstractCodeParameterTests
+
+#Region "FullName tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestFullName1() As Task
+            Dim code =
+<Code>
+Class C
+    Sub Foo($$s As String)
+    End Sub
+End Class
+</Code>
+
+            Await TestFullName(code, "s")
+        End Function
+#End Region
+
+#Region "Name tests"
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName_NoModifiers() As Task
+            Dim code =
+<Code>
+Public Class C1
+
+   Public Sub S1($$p1 As Integer)
+   End Sub
+
+End Class
+</Code>
+
+            Await TestName(code, "p1")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName_ByValModifier() As Task
+            Dim code =
+<Code>
+Public Class C1
+
+   Public Sub S2(ByVal $$p2 As Integer)
+   End Sub
+
+End Class
+</Code>
+
+            Await TestName(code, "p2")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName_ByRefModifier() As Task
+            Dim code =
+<Code>
+Public Class C1
+
+   Public Sub S3(ByRef $$p3 As Integer)
+   End Sub
+
+End Class
+</Code>
+
+            Await TestName(code, "p3")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName_OptionalByValModifiers() As Task
+            Dim code =
+<Code>
+Public Class C1
+
+   Public Sub S4(Optional ByVal $$p4 As Integer = 0)
+   End Sub
+
+End Class
+</Code>
+
+            Await TestName(code, "p4")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName_ByValParamArrayModifiers() As Task
+            Dim code =
+<Code>
+Public Class C1
+
+   Public Sub S5(ByVal ParamArray $$p5() As Integer)
+   End Sub
+
+End Class
+</Code>
+
+            Await TestName(code, "p5")
+        End Function
+
+        <ConditionalWpfFact(GetType(x86)), Trait(Traits.Feature, Traits.Features.CodeModel)>
+        Public Async Function TestName_TypeCharacter() As Task
+            Dim code =
+<Code>
+Public Class C1
+
+   Public Sub S6($$p6%)
+   End Sub
+
+End Class
+</Code>
+
+            Await TestName(code, "p6")
+        End Function
+
+#End Region
+
+        Protected Overrides ReadOnly Property LanguageName As String = LanguageNames.VisualBasic
+        Protected Overrides ReadOnly Property TargetExternalCodeElements As Boolean = True
+
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/src/VisualStudio/Core/Test/ServicesVisualStudioTest.vbproj b/src/VisualStudio/Core/Test/ServicesVisualStudioTest.vbproj
index 7c46de5ea0b9d3b599cbd3e28d6c8a1fe345dc10..615367d1dce13c444e1f41cda662c1884152083d 100644
--- a/src/VisualStudio/Core/Test/ServicesVisualStudioTest.vbproj
+++ b/src/VisualStudio/Core/Test/ServicesVisualStudioTest.vbproj
@@ -289,6 +289,8 @@
     <Compile Include="CodeModel\CSharp\CodeVariableTests.vb" />
     <Compile Include="CodeModel\CSharp\EventCollectorTests.vb" />
     <Compile Include="CodeModel\CSharp\ExternalCodeClassTests.vb" />
+    <Compile Include="CodeModel\CSharp\ExternalCodeFunctionTests.vb" />
+    <Compile Include="CodeModel\CSharp\ExternalCodeParameterTests.vb" />
     <Compile Include="CodeModel\CSharp\FileCodeModelTests.vb" />
     <Compile Include="CodeModel\CSharp\RootCodeModelTests.vb" />
     <Compile Include="CodeModel\CSharp\SyntaxNodeKeyTests.vb" />
@@ -323,6 +325,8 @@
     <Compile Include="CodeModel\VisualBasic\CodeVariableTests.vb" />
     <Compile Include="CodeModel\VisualBasic\EventCollectorTests.vb" />
     <Compile Include="CodeModel\VisualBasic\ExternalCodeClassTests.vb" />
+    <Compile Include="CodeModel\VisualBasic\ExternalCodeFunctionTests.vb" />
+    <Compile Include="CodeModel\VisualBasic\ExternalCodeParameterTests.vb" />
     <Compile Include="CodeModel\VisualBasic\FileCodeModelTests.vb" />
     <Compile Include="CodeModel\VisualBasic\ImplementsStatementTests.vb" />
     <Compile Include="CodeModel\VisualBasic\InheritsStatementTests.vb" />
diff --git a/src/VisualStudio/VisualBasic/Impl/CodeModel/VisualBasicCodeModelService.vb b/src/VisualStudio/VisualBasic/Impl/CodeModel/VisualBasicCodeModelService.vb
index 1525f856790ce2bd00738a1b76a354bea5e77249..b911297ab504196294b5a1f19bd9c9fe51bd7171 100644
--- a/src/VisualStudio/VisualBasic/Impl/CodeModel/VisualBasicCodeModelService.vb
+++ b/src/VisualStudio/VisualBasic/Impl/CodeModel/VisualBasicCodeModelService.vb
@@ -56,14 +56,16 @@ Namespace Microsoft.VisualStudio.LanguageServices.VisualBasic.CodeModel
         Private Shared ReadOnly s_externalNameFormat As SymbolDisplayFormat =
             New SymbolDisplayFormat(
                 genericsOptions:=SymbolDisplayGenericsOptions.IncludeTypeParameters,
-                miscellaneousOptions:=SymbolDisplayMiscellaneousOptions.ExpandNullable)
+                miscellaneousOptions:=SymbolDisplayMiscellaneousOptions.ExpandNullable,
+                parameterOptions:=SymbolDisplayParameterOptions.IncludeName)
 
         Private Shared ReadOnly s_externalfullNameFormat As SymbolDisplayFormat =
             New SymbolDisplayFormat(
                 typeQualificationStyle:=SymbolDisplayTypeQualificationStyle.NameAndContainingTypesAndNamespaces,
                 genericsOptions:=SymbolDisplayGenericsOptions.IncludeTypeParameters,
                 memberOptions:=SymbolDisplayMemberOptions.IncludeContainingType,
-                miscellaneousOptions:=SymbolDisplayMiscellaneousOptions.ExpandNullable)
+                miscellaneousOptions:=SymbolDisplayMiscellaneousOptions.ExpandNullable,
+                parameterOptions:=SymbolDisplayParameterOptions.IncludeName)
 
         Private Shared ReadOnly s_setTypeFormat As SymbolDisplayFormat =
             New SymbolDisplayFormat(