diff --git a/schema/cloud.exclusions.schema.json b/schema/cloud.exclusions.schema.json
index 7563fff..33999ac 100644
--- a/schema/cloud.exclusions.schema.json
+++ b/schema/cloud.exclusions.schema.json
@@ -24,6 +24,8 @@
           "enum": [
             "Global",
             "UsGov",
+            "UsGovL4",
+            "UsGovL5",
             "China"
           ]
         },
diff --git a/src/CheckCloudSupport.csproj b/src/CheckCloudSupport.csproj
index df4ce8e..0b78737 100644
--- a/src/CheckCloudSupport.csproj
+++ b/src/CheckCloudSupport.csproj
@@ -14,7 +14,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Markdig" Version="1.1.3" />
+    <PackageReference Include="Markdig" Version="1.2.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.7" />
     <PackageReference Include="Microsoft.OpenApi" Version="3.5.3" />
     <PackageReference Include="Microsoft.OpenApi.OData" Version="3.2.1" />
diff --git a/src/Docs/ApiDocument.cs b/src/Docs/ApiDocument.cs
index 7d4300c..dbe1f3b 100644
--- a/src/Docs/ApiDocument.cs
+++ b/src/Docs/ApiDocument.cs
@@ -215,9 +215,13 @@ private static string GetIncludeLine(CloudSupportStatus status, string includeDi
         return status switch
         {
             CloudSupportStatus.AllClouds => $"[!INCLUDE [national-cloud-support]({includeDirectory}/all-clouds.md)]",
-            CloudSupportStatus.GlobalAndUSGov => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-us.md)]",
             CloudSupportStatus.GlobalAndChina => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-china.md)]",
-            CloudSupportStatus.GlobalOnly => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-only.md)]",
+            CloudSupportStatus.GlobalAndChinaAndUsGovL4 => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-china-us-l4.md)]",
+            CloudSupportStatus.GlobalAndChinaAndUsGovL5 => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-china-us-l5.md)]",
+            CloudSupportStatus.GlobalAndUSGov => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-us.md)]",
+            CloudSupportStatus.GlobalAndUsGovL4 => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-us-l4.md)]",
+            CloudSupportStatus.GlobalAndUsGovL5 => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-us-l5.md)]",
+            CloudSupportStatus.Global => $"[!INCLUDE [national-cloud-support]({includeDirectory}/global-only.md)]",
             _ => throw new ArgumentException("Invalid cloud support status"),
         };
     }
diff --git a/src/Docs/CloudSupportStatus.cs b/src/Docs/CloudSupportStatus.cs
index 8748f36..ee172f3 100644
--- a/src/Docs/CloudSupportStatus.cs
+++ b/src/Docs/CloudSupportStatus.cs
@@ -6,30 +6,71 @@ namespace CheckCloudSupport.Docs;
 /// <summary>
 /// Represents the cloud support status of an API.
 /// </summary>
+[Flags]
 public enum CloudSupportStatus
 {
     /// <summary>
     /// Cloud support status is undetermined.
     /// </summary>
-    Unknown,
+    Unknown = 0,
 
     /// <summary>
-    /// API is supported in all public national clouds.
+    /// API is supported in Chinese cloud.
     /// </summary>
-    AllClouds,
+    China = 1 << 0,
 
     /// <summary>
-    /// API is supported in the global and US Government clouds only.
+    /// API is supported in the global cloud.
     /// </summary>
-    GlobalAndUSGov,
+    Global = 1 << 1,
 
     /// <summary>
-    /// API is supported in the global and Chinese clouds only.
+    /// API is supported in the US Government L4 cloud.
     /// </summary>
-    GlobalAndChina,
+    USGovL4 = 1 << 2,
 
     /// <summary>
-    /// API is supported in the global cloud only.
+    /// API is supported in the US Government L5 cloud.
     /// </summary>
-    GlobalOnly,
+    USGovL5 = 1 << 3,
+
+    /// <summary>
+    /// API is supported in the US Government cloud (L4 and L5).
+    /// </summary>
+    USGov = USGovL4 | USGovL5,
+
+    /// <summary>
+    /// API is supported in all clouds (China, Global, and US Government).
+    /// </summary>
+    AllClouds = China | Global | USGov,
+
+    /// <summary>
+    /// API is supported in both Global and US Government clouds.
+    /// </summary>
+    GlobalAndUSGov = Global | USGov,
+
+    /// <summary>
+    /// API is supported in both Global and Chinese clouds.
+    /// </summary>
+    GlobalAndChina = Global | China,
+
+    /// <summary>
+    /// API is supported in both Global and US Government L4 clouds.
+    /// </summary>
+    GlobalAndUsGovL4 = Global | USGovL4,
+
+    /// <summary>
+    /// API is supported in both Global and US Government L5 clouds.
+    /// </summary>
+    GlobalAndUsGovL5 = Global | USGovL5,
+
+    /// <summary>
+    /// API is supported in Global, Chinese, and US Government L4 clouds.
+    /// </summary>
+    GlobalAndChinaAndUsGovL4 = Global | China | USGovL4,
+
+    /// <summary>
+    /// API is supported in Global, Chinese, and US Government L5 clouds.
+    /// </summary>
+    GlobalAndChinaAndUsGovL5 = Global | China | USGovL5,
 }
diff --git a/src/Docs/DocSet.cs b/src/Docs/DocSet.cs
index f3d90c2..d0ef491 100644
--- a/src/Docs/DocSet.cs
+++ b/src/Docs/DocSet.cs
@@ -38,32 +38,6 @@ public static async Task<DocSet> CreateFromDirectory(string docsRoot)
         return docSet;
     }
 
-    /// <summary>
-    /// Combines two <see cref="CloudSupportStatus"/> into the most inclusive value.
-    /// </summary>
-    /// <param name="a">The first status.</param>
-    /// <param name="b">The second status.</param>
-    /// <returns>The combined status.</returns>
-    public static CloudSupportStatus CombineStatuses(CloudSupportStatus a, CloudSupportStatus b)
-    {
-        if (a == b)
-        {
-            return a;
-        }
-
-        if (a == CloudSupportStatus.Unknown || a == CloudSupportStatus.GlobalOnly)
-        {
-            return b == CloudSupportStatus.Unknown ? CloudSupportStatus.GlobalOnly : b;
-        }
-
-        if (b == CloudSupportStatus.Unknown || b == CloudSupportStatus.GlobalOnly)
-        {
-            return a;
-        }
-
-        return CloudSupportStatus.AllClouds;
-    }
-
     /// <summary>
     /// Loads the Markdown files in the root directory into the <see cref="DocSet"/>.
     /// </summary>
diff --git a/src/Extensions/OpenApiUrlTreeNodeExtensions.cs b/src/Extensions/OpenApiUrlTreeNodeExtensions.cs
index b7b4065..af17804 100644
--- a/src/Extensions/OpenApiUrlTreeNodeExtensions.cs
+++ b/src/Extensions/OpenApiUrlTreeNodeExtensions.cs
@@ -118,33 +118,57 @@ public static CloudSupportStatus GetCloudSupportStatus(
             method = HttpMethod.Get;
         }
 
-        var supportsGlobal = node.PathItems.ContainsKey("Global") &&
-            (node.PathItems["Global"].Operations?.ContainsKey(method) ?? false);
-        var supportsUsGov = node.PathItems.ContainsKey("UsGov") &&
-            (node.PathItems["UsGov"].Operations?.ContainsKey(method) ?? false) &&
-            !OpenAPIOverrides.CheckIfCloudExcluded(node.Path, method, "UsGov") &&
-            !OpenAPIOverrides.CheckIfCloudExcludedForFile(fileName, "UsGov");
-        var supportsChina = node.PathItems.ContainsKey("China") &&
-            (node.PathItems["China"].Operations?.ContainsKey(method) ?? false) &&
+        var supportStatus = node.PathItems.TryGetValue("Global", out IOpenApiPathItem? globalValue) &&
+            (globalValue.Operations?.ContainsKey(method) ?? false)
+                ? CloudSupportStatus.Global
+                : CloudSupportStatus.Unknown;
+        if (supportStatus == CloudSupportStatus.Unknown)
+        {
+            return supportStatus;
+        }
+
+        if (node.PathItems.TryGetValue("UsGov", out IOpenApiPathItem? usGovValue) &&
+            (usGovValue.Operations?.ContainsKey(method) ?? false))
+        {
+            supportStatus |= GetUsGovCloudSupportStatus(node.Path, method, fileName);
+        }
+
+        if (node.PathItems.TryGetValue("China", out IOpenApiPathItem? chinaValue) &&
+            (chinaValue.Operations?.ContainsKey(method) ?? false) &&
             !OpenAPIOverrides.CheckIfCloudExcluded(node.Path, method, "China") &&
-            !OpenAPIOverrides.CheckIfCloudExcludedForFile(fileName, "China");
+            !OpenAPIOverrides.CheckIfCloudExcludedForFile(fileName, "China"))
+        {
+            supportStatus |= CloudSupportStatus.China;
+        }
+
+        return supportStatus;
+    }
+
+    private static CloudSupportStatus GetUsGovCloudSupportStatus(
+        string apiPath,
+        HttpMethod? method,
+        string fileName)
+    {
+        var supportStatus = CloudSupportStatus.USGov;
 
-        if (!supportsGlobal)
+        if (OpenAPIOverrides.CheckIfCloudExcluded(apiPath, method, "UsGov") ||
+            OpenAPIOverrides.CheckIfCloudExcludedForFile(fileName, "UsGov"))
         {
-            // Only process APIs that exist in Global cloud
             return CloudSupportStatus.Unknown;
         }
 
-        if (supportsUsGov && supportsChina)
+        if (OpenAPIOverrides.CheckIfCloudExcluded(apiPath, method, "UsGovL4") ||
+            OpenAPIOverrides.CheckIfCloudExcludedForFile(fileName, "UsGovL4"))
         {
-            return CloudSupportStatus.AllClouds;
+            supportStatus &= ~CloudSupportStatus.USGovL4;
         }
 
-        if (!supportsUsGov && !supportsChina)
+        if (OpenAPIOverrides.CheckIfCloudExcluded(apiPath, method, "UsGovL5") ||
+            OpenAPIOverrides.CheckIfCloudExcludedForFile(fileName, "UsGovL5"))
         {
-            return CloudSupportStatus.GlobalOnly;
+            supportStatus &= ~CloudSupportStatus.USGovL5;
         }
 
-        return supportsUsGov ? CloudSupportStatus.GlobalAndUSGov : CloudSupportStatus.GlobalAndChina;
+        return supportStatus;
     }
 }
diff --git a/src/Extensions/StringExtensions.cs b/src/Extensions/StringExtensions.cs
index 7e8ab7d..acd3db1 100644
--- a/src/Extensions/StringExtensions.cs
+++ b/src/Extensions/StringExtensions.cs
@@ -37,7 +37,7 @@ public static string NormalizeIdSegments(this string path)
         normalizedPath = normalizedPath.Replace("/{name}", "/{id}");
 
         // Replace any segments wrapped in braces that contain "id"
-        normalizedPath = IdSegmentRegex().Replace(normalizedPath, "{id}");
+        normalizedPath = IdSegmentRegex().Replace(normalizedPath, "/{id}");
 
         return normalizedPath;
     }
@@ -211,13 +211,13 @@ public static bool IsEqualIgnoringCase(this string value, string compareTo)
         return compareValue == 0;
     }
 
-    [GeneratedRegex("{[^{}]*id[^{}]*}", RegexOptions.IgnoreCase)]
+    [GeneratedRegex("\\/{[^{}]*id[^{}]*}", RegexOptions.IgnoreCase)]
     private static partial Regex IdSegmentRegex();
 
-    [GeneratedRegex("\\(((?>\\w*='?\\{?[\\w-]*\\}?'?,?)+)\\)")]
+    [GeneratedRegex("\\(((?>\\w*='?\\{?[\\w@-]*\\}?'?,?)+)\\)")]
     private static partial Regex ParameterListRegex();
 
-    [GeneratedRegex("(?<param>\\w*)='?(?<value>\\{?[\\w-]*\\}?)'?")]
+    [GeneratedRegex("(?<param>\\w*)='?(?<value>\\{?[\\w@-]*\\}?)'?")]
     private static partial Regex ParameterValuePairRegex();
 
     [GeneratedRegex("^\\/users\\/{id}\\/drive\\/")]
diff --git a/src/Program.cs b/src/Program.cs
index 5c7501d..b4c8419 100644
--- a/src/Program.cs
+++ b/src/Program.cs
@@ -160,7 +160,7 @@
                     supportStatus,
                     apiDoc.CloudSupportStatus);
 
-                apiDoc.CloudSupportStatus = DocSet.CombineStatuses(apiDoc.CloudSupportStatus, supportStatus);
+                apiDoc.CloudSupportStatus |= supportStatus;
             }
             else
             {
@@ -340,7 +340,7 @@
                     supportStatus,
                     v1CloudSupportStatus);
 
-                v1CloudSupportStatus = DocSet.CombineStatuses(v1CloudSupportStatus, supportStatus);
+                v1CloudSupportStatus |= supportStatus;
             }
             else
             {
@@ -377,7 +377,7 @@
                     supportStatus,
                     betaCloudSupportStatus);
 
-                betaCloudSupportStatus = DocSet.CombineStatuses(betaCloudSupportStatus, supportStatus);
+                betaCloudSupportStatus |= supportStatus;
             }
             else
             {
diff --git a/test/DocSetTests.cs b/test/DocSetTests.cs
deleted file mode 100644
index c43c953..0000000
--- a/test/DocSetTests.cs
+++ /dev/null
@@ -1,47 +0,0 @@
-using CheckCloudSupport.Docs;
-
-namespace CheckCloudSupportTests;
-
-public class DocSetTests
-{
-    public static TheoryData<CloudSupportStatus, CloudSupportStatus, CloudSupportStatus> CombineTestData => new()
-    {
-        {CloudSupportStatus.Unknown, CloudSupportStatus.Unknown, CloudSupportStatus.Unknown},
-        {CloudSupportStatus.Unknown, CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalOnly},
-        {CloudSupportStatus.Unknown, CloudSupportStatus.AllClouds, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.Unknown, CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.GlobalAndUSGov},
-        {CloudSupportStatus.Unknown, CloudSupportStatus.GlobalAndChina, CloudSupportStatus.GlobalAndChina},
-
-        {CloudSupportStatus.GlobalOnly, CloudSupportStatus.Unknown, CloudSupportStatus.GlobalOnly},
-        {CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalOnly},
-        {CloudSupportStatus.GlobalOnly, CloudSupportStatus.AllClouds, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.GlobalAndUSGov},
-        {CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalAndChina, CloudSupportStatus.GlobalAndChina},
-
-        {CloudSupportStatus.AllClouds, CloudSupportStatus.Unknown, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.AllClouds, CloudSupportStatus.GlobalOnly, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.AllClouds, CloudSupportStatus.AllClouds, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.AllClouds, CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.AllClouds, CloudSupportStatus.GlobalAndChina, CloudSupportStatus.AllClouds},
-
-        {CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.Unknown, CloudSupportStatus.GlobalAndUSGov},
-        {CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalAndUSGov},
-        {CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.AllClouds, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.GlobalAndUSGov},
-        {CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.GlobalAndChina, CloudSupportStatus.AllClouds},
-
-        {CloudSupportStatus.GlobalAndChina, CloudSupportStatus.Unknown, CloudSupportStatus.GlobalAndChina},
-        {CloudSupportStatus.GlobalAndChina, CloudSupportStatus.GlobalOnly, CloudSupportStatus.GlobalAndChina},
-        {CloudSupportStatus.GlobalAndChina, CloudSupportStatus.AllClouds, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.GlobalAndChina, CloudSupportStatus.GlobalAndUSGov, CloudSupportStatus.AllClouds},
-        {CloudSupportStatus.GlobalAndChina, CloudSupportStatus.GlobalAndChina, CloudSupportStatus.GlobalAndChina},
-
-    };
-
-    [Theory]
-    [MemberData(nameof(CombineTestData))]
-    public void CloudStatusesCombineCorrectly(CloudSupportStatus a, CloudSupportStatus b, CloudSupportStatus combined)
-    {
-        Assert.Equal(combined, DocSet.CombineStatuses(a, b));
-    }
-}