diff --git a/cli/lsp/diagnostics.rs b/cli/lsp/diagnostics.rs
index a8faee1a851c25..5054aa93104824 100644
--- a/cli/lsp/diagnostics.rs
+++ b/cli/lsp/diagnostics.rs
@@ -337,9 +337,9 @@ impl DiagnosticsState {
       if diagnostic.code
         == Some(lsp::NumberOrString::String("no-cache".to_string()))
         || diagnostic.code
-          == Some(lsp::NumberOrString::String("no-cache-jsr".to_string()))
+          == Some(lsp::NumberOrString::String("not-installed-jsr".to_string()))
         || diagnostic.code
-          == Some(lsp::NumberOrString::String("no-cache-npm".to_string()))
+          == Some(lsp::NumberOrString::String("not-installed-npm".to_string()))
       {
         no_cache_diagnostics.push(diagnostic.clone());
       }
@@ -991,9 +991,9 @@ pub enum DenoDiagnostic {
   /// A remote module was not found in the cache.
   NoCache(ModuleSpecifier),
   /// A remote jsr package reference was not found in the cache.
-  NoCacheJsr(PackageReq, ModuleSpecifier),
+  NotInstalledJsr(PackageReq, ModuleSpecifier),
   /// A remote npm package reference was not found in the cache.
-  NoCacheNpm(PackageReq, ModuleSpecifier),
+  NotInstalledNpm(PackageReq, ModuleSpecifier),
   /// A local module was not found on the local file system.
   NoLocal(ModuleSpecifier),
   /// The specifier resolved to a remote specifier that was redirected to
@@ -1018,8 +1018,8 @@ impl DenoDiagnostic {
       Self::InvalidAttributeType(_) => "invalid-attribute-type",
       Self::NoAttributeType => "no-attribute-type",
       Self::NoCache(_) => "no-cache",
-      Self::NoCacheJsr(_, _) => "no-cache-jsr",
-      Self::NoCacheNpm(_, _) => "no-cache-npm",
+      Self::NotInstalledJsr(_, _) => "not-installed-jsr",
+      Self::NotInstalledNpm(_, _) => "not-installed-npm",
       Self::NoLocal(_) => "no-local",
       Self::Redirect { .. } => "redirect",
       Self::ResolutionError(err) => {
@@ -1100,17 +1100,22 @@ impl DenoDiagnostic {
           }),
           ..Default::default()
         },
-        "no-cache" | "no-cache-jsr" | "no-cache-npm" => {
+        "no-cache" | "not-installed-jsr" | "not-installed-npm" => {
           let data = diagnostic
             .data
             .clone()
             .ok_or_else(|| anyhow!("Diagnostic is missing data"))?;
           let data: DiagnosticDataSpecifier = serde_json::from_value(data)?;
+          let title = if matches!(
+            code.as_str(),
+            "not-installed-jsr" | "not-installed-npm"
+          ) {
+            format!("Install \"{}\" and its dependencies.", data.specifier)
+          } else {
+            format!("Cache \"{}\" and its dependencies.", data.specifier)
+          };
           lsp::CodeAction {
-            title: format!(
-              "Cache \"{}\" and its dependencies.",
-              data.specifier
-            ),
+            title,
             kind: Some(lsp::CodeActionKind::QUICKFIX),
             diagnostics: Some(vec![diagnostic.clone()]),
             command: Some(lsp::Command {
@@ -1216,8 +1221,8 @@ impl DenoDiagnostic {
       match code.as_str() {
         "import-map-remap"
         | "no-cache"
-        | "no-cache-jsr"
-        | "no-cache-npm"
+        | "not-installed-jsr"
+        | "not-installed-npm"
         | "no-attribute-type"
         | "redirect"
         | "import-node-prefix-missing" => true,
@@ -1255,8 +1260,8 @@ impl DenoDiagnostic {
       Self::InvalidAttributeType(assert_type) => (lsp::DiagnosticSeverity::ERROR, format!("The module is a JSON module and expected an attribute type of \"json\". Instead got \"{assert_type}\"."), None),
       Self::NoAttributeType => (lsp::DiagnosticSeverity::ERROR, "The module is a JSON module and not being imported with an import attribute. Consider adding `with { type: \"json\" }` to the import statement.".to_string(), None),
       Self::NoCache(specifier) => (lsp::DiagnosticSeverity::ERROR, format!("Uncached or missing remote URL: {specifier}"), Some(json!({ "specifier": specifier }))),
-      Self::NoCacheJsr(pkg_req, specifier) => (lsp::DiagnosticSeverity::ERROR, format!("Uncached or missing jsr package: {}", pkg_req), Some(json!({ "specifier": specifier }))),
-      Self::NoCacheNpm(pkg_req, specifier) => (lsp::DiagnosticSeverity::ERROR, format!("Uncached or missing npm package: {}", pkg_req), Some(json!({ "specifier": specifier }))),
+      Self::NotInstalledJsr(pkg_req, specifier) => (lsp::DiagnosticSeverity::ERROR, format!("JSR package \"{pkg_req}\" is not installed or doesn't exist."), Some(json!({ "specifier": specifier }))),
+      Self::NotInstalledNpm(pkg_req, specifier) => (lsp::DiagnosticSeverity::ERROR, format!("NPM package \"{pkg_req}\" is not installed or doesn't exist."), Some(json!({ "specifier": specifier }))),
       Self::NoLocal(specifier) => {
         let maybe_sloppy_resolution = SloppyImportsResolver::new(Arc::new(deno_fs::RealFs)).resolve(specifier, ResolutionMode::Execution);
         let data = maybe_sloppy_resolution.as_ref().map(|res| {
@@ -1410,7 +1415,8 @@ fn diagnose_resolution(
         JsrPackageReqReference::from_specifier(specifier)
       {
         let req = pkg_ref.into_inner().req;
-        diagnostics.push(DenoDiagnostic::NoCacheJsr(req, specifier.clone()));
+        diagnostics
+          .push(DenoDiagnostic::NotInstalledJsr(req, specifier.clone()));
       } else if let Ok(pkg_ref) =
         NpmPackageReqReference::from_specifier(specifier)
       {
@@ -1419,7 +1425,7 @@ fn diagnose_resolution(
           let req = pkg_ref.into_inner().req;
           if !npm_resolver.is_pkg_req_folder_cached(&req) {
             diagnostics
-              .push(DenoDiagnostic::NoCacheNpm(req, specifier.clone()));
+              .push(DenoDiagnostic::NotInstalledNpm(req, specifier.clone()));
           }
         }
       } else if let Some(module_name) = specifier.as_str().strip_prefix("node:")
@@ -1445,7 +1451,7 @@ fn diagnose_resolution(
           // check that a @types/node package exists in the resolver
           let types_node_req = PackageReq::from_str("@types/node").unwrap();
           if !npm_resolver.is_pkg_req_folder_cached(&types_node_req) {
-            diagnostics.push(DenoDiagnostic::NoCacheNpm(
+            diagnostics.push(DenoDiagnostic::NotInstalledNpm(
               types_node_req,
               ModuleSpecifier::parse("npm:@types/node").unwrap(),
             ));
diff --git a/cli/lsp/language_server.rs b/cli/lsp/language_server.rs
index ff3a7f0c686b56..0815398d5b1dd8 100644
--- a/cli/lsp/language_server.rs
+++ b/cli/lsp/language_server.rs
@@ -1667,9 +1667,9 @@ impl Inner {
             if diagnostic.code
               == Some(NumberOrString::String("no-cache".to_string()))
               || diagnostic.code
-                == Some(NumberOrString::String("no-cache-jsr".to_string()))
+                == Some(NumberOrString::String("not-installed-jsr".to_string()))
               || diagnostic.code
-                == Some(NumberOrString::String("no-cache-npm".to_string()))
+                == Some(NumberOrString::String("not-installed-npm".to_string()))
             {
               includes_no_cache = true;
             }
diff --git a/tests/integration/lsp_tests.rs b/tests/integration/lsp_tests.rs
index cacd05d9fbd222..02a4bfeea6d4ae 100644
--- a/tests/integration/lsp_tests.rs
+++ b/tests/integration/lsp_tests.rs
@@ -5221,9 +5221,9 @@ fn lsp_code_actions_deno_cache_jsr() {
           "end": { "line": 1, "character": 49 },
         },
         "severity": 1,
-        "code": "no-cache-jsr",
+        "code": "not-installed-jsr",
         "source": "deno",
-        "message": "Uncached or missing jsr package: @denotest/add@1",
+        "message": "JSR package \"@denotest/add@1\" is not installed or doesn't exist.",
         "data": { "specifier": "jsr:@denotest/add@1" },
       }],
       "version": 1,
@@ -5244,9 +5244,9 @@ fn lsp_code_actions_deno_cache_jsr() {
             "end": { "line": 1, "character": 49 },
           },
           "severity": 1,
-          "code": "no-cache-jsr",
+          "code": "not-installed-jsr",
           "source": "deno",
-          "message": "Uncached or missing jsr package: @denotest/add@1",
+          "message": "JSR package \"@denotest/add@1\" is not installed or doesn't exist.",
           "data": { "specifier": "jsr:@denotest/add@1" },
         }],
         "only": ["quickfix"],
@@ -5256,7 +5256,7 @@ fn lsp_code_actions_deno_cache_jsr() {
   assert_eq!(
     res,
     json!([{
-      "title": "Cache \"jsr:@denotest/add@1\" and its dependencies.",
+      "title": "Install \"jsr:@denotest/add@1\" and its dependencies.",
       "kind": "quickfix",
       "diagnostics": [{
         "range": {
@@ -5264,9 +5264,9 @@ fn lsp_code_actions_deno_cache_jsr() {
           "end": { "line": 1, "character": 49 },
         },
         "severity": 1,
-        "code": "no-cache-jsr",
+        "code": "not-installed-jsr",
         "source": "deno",
-        "message": "Uncached or missing jsr package: @denotest/add@1",
+        "message": "JSR package \"@denotest/add@1\" is not installed or doesn't exist.",
         "data": { "specifier": "jsr:@denotest/add@1" },
       }],
       "command": {
@@ -5710,9 +5710,9 @@ fn lsp_code_actions_deno_cache_npm() {
           "end": { "line": 0, "character": 29 }
         },
         "severity": 1,
-        "code": "no-cache-npm",
+        "code": "not-installed-npm",
         "source": "deno",
-        "message": "Uncached or missing npm package: chalk",
+        "message": "NPM package \"chalk\" is not installed or doesn't exist.",
         "data": { "specifier": "npm:chalk" }
       }],
       "version": 1
@@ -5737,9 +5737,9 @@ fn lsp_code_actions_deno_cache_npm() {
             "end": { "line": 0, "character": 29 }
           },
           "severity": 1,
-          "code": "no-cache-npm",
+          "code": "not-installed-npm",
           "source": "deno",
-          "message": "Uncached or missing npm package: chalk",
+          "message": "NPM package \"chalk\" is not installed or doesn't exist.",
           "data": { "specifier": "npm:chalk" }
         }],
         "only": ["quickfix"]
@@ -5749,7 +5749,7 @@ fn lsp_code_actions_deno_cache_npm() {
   assert_eq!(
     res,
     json!([{
-      "title": "Cache \"npm:chalk\" and its dependencies.",
+      "title": "Install \"npm:chalk\" and its dependencies.",
       "kind": "quickfix",
       "diagnostics": [{
         "range": {
@@ -5757,9 +5757,9 @@ fn lsp_code_actions_deno_cache_npm() {
           "end": { "line": 0, "character": 29 }
         },
         "severity": 1,
-        "code": "no-cache-npm",
+        "code": "not-installed-npm",
         "source": "deno",
-        "message": "Uncached or missing npm package: chalk",
+        "message": "NPM package \"chalk\" is not installed or doesn't exist.",
         "data": { "specifier": "npm:chalk" }
       }],
       "command": {
@@ -5812,9 +5812,9 @@ fn lsp_code_actions_deno_cache_all() {
             "end": { "line": 2, "character": 37 },
           },
           "severity": 1,
-          "code": "no-cache-npm",
+          "code": "not-installed-npm",
           "source": "deno",
-          "message": "Uncached or missing npm package: chalk",
+          "message": "NPM package \"chalk\" is not installed or doesn't exist.",
           "data": { "specifier": "npm:chalk" },
         },
       ],
@@ -5900,9 +5900,9 @@ fn lsp_code_actions_deno_cache_all() {
               "end": { "line": 2, "character": 37 },
             },
             "severity": 1,
-            "code": "no-cache-npm",
+            "code": "not-installed-npm",
             "source": "deno",
-            "message": "Uncached or missing npm package: chalk",
+            "message": "NPM package \"chalk\" is not installed or doesn't exist.",
             "data": { "specifier": "npm:chalk" },
           },
         ],
@@ -8956,7 +8956,8 @@ fn lsp_completions_node_builtin() {
     .diagnostics
     .into_iter()
     .filter(|d| {
-      d.code == Some(lsp::NumberOrString::String("no-cache-npm".to_string()))
+      d.code
+        == Some(lsp::NumberOrString::String("not-installed-npm".to_string()))
     })
     .collect::<Vec<_>>();
 
@@ -8972,9 +8973,9 @@ fn lsp_completions_node_builtin() {
           "specifier": "npm:@types/node",
         },
         "severity": 1,
-        "code": "no-cache-npm",
+        "code": "not-installed-npm",
         "source": "deno",
-        "message": "Uncached or missing npm package: @types/node"
+        "message": "NPM package \"@types/node\" is not installed or doesn't exist."
       }
     ])
   );