diff --git a/extensions/typescript/src/typescriptServiceClient.ts b/extensions/typescript/src/typescriptServiceClient.ts
index 3fdb6094b10..a6e4771c2fb 100644
--- a/extensions/typescript/src/typescriptServiceClient.ts
+++ b/extensions/typescript/src/typescriptServiceClient.ts
@@ -116,8 +116,11 @@ class RequestQueue {
 	}
 }
 
+export interface IClientVersion {
+	readonly clientVersion: string;
+}
 
-export default class TypeScriptServiceClient implements ITypescriptServiceClient {
+export default class TypeScriptServiceClient implements ITypescriptServiceClient, IClientVersion {
 	private static readonly WALK_THROUGH_SNIPPET_SCHEME = 'walkThroughSnippet';
 	private static readonly WALK_THROUGH_SNIPPET_SCHEME_COLON = `${TypeScriptServiceClient.WALK_THROUGH_SNIPPET_SCHEME}:`;
 
@@ -148,8 +151,15 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 	private readonly _onDidEndInstallTypings = new EventEmitter<Proto.EndInstallTypesEventBody>();
 	private readonly _onTypesInstallerInitializationFailed = new EventEmitter<Proto.TypesInstallerInitializationFailedEventBody>();
 
-	private _apiVersion: API;
 	private telemetryReporter: TelemetryReporter;
+	/**
+	 * API version obtained from the version picker after checking the corresponding path exists.
+	 */
+	private _apiVersion: API;
+	/**
+	 * Version reported by currently-running tsserver.
+	 */
+	private _tsserverVersion: string | undefined;
 
 	private readonly disposables: Disposable[] = [];
 
@@ -178,6 +188,7 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 		this.versionPicker = new TypeScriptVersionPicker(this.versionProvider, this.workspaceState);
 
 		this._apiVersion = API.defaultVersion;
+		this._tsserverVersion = undefined;
 		this.tracer = new Tracer(this.logger);
 
 		workspace.onDidChangeConfiguration(() => {
@@ -199,7 +210,7 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 				}
 			}
 		}, this, this.disposables);
-		this.telemetryReporter = new TelemetryReporter();
+		this.telemetryReporter = new TelemetryReporter(this);
 		this.disposables.push(this.telemetryReporter);
 		this.startService();
 	}
@@ -237,6 +248,7 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 					this.info('Killing TS Server');
 					this.isRestarting = true;
 					cp.kill();
+					this.resetClientVersion();
 				}
 			}).then(start);
 		} else {
@@ -268,6 +280,10 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 		return this._apiVersion;
 	}
 
+	public get clientVersion(): string {
+		return this._tsserverVersion || this._apiVersion.versionString;
+	}
+
 	public onReady(): Promise<void> {
 		return this._onReady.promise;
 	}
@@ -337,6 +353,7 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 							}
 						*/
 						this.logTelemetry('error', { message: err.message });
+						this.resetClientVersion();
 						return;
 					}
 
@@ -497,7 +514,10 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 		this.tsServerLogFile = null;
 		this.callbacks.destroy(new Error('Service died.'));
 		this.callbacks = new CallbackMap();
-		if (restart) {
+		if (!restart) {
+			this.resetClientVersion();
+		}
+		else {
 			const diff = Date.now() - this.lastStart;
 			this.numberRestarts++;
 			let startService = true;
@@ -518,6 +538,7 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 						"serviceExited" : {}
 					*/
 					this.logTelemetry('serviceExited');
+					this.resetClientVersion();
 				} else if (diff < 60 * 1000 /* 1 Minutes */) {
 					this.lastStart = Date.now();
 					prompt = window.showWarningMessage<MyMessageItem>(
@@ -808,6 +829,10 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 				}
 				break;
 		}
+		if (telemetryData.telemetryEventName === 'projectInfo') {
+			this._tsserverVersion = properties['version'];
+		}
+
 		/* __GDPR__
 			"typingsInstalled" : {
 				"installedPackages" : { "classification": "PublicNonPersonalData", "purpose": "FeatureInsight" },
@@ -883,6 +908,11 @@ export default class TypeScriptServiceClient implements ITypescriptServiceClient
 		}
 		return args;
 	}
+
+	private resetClientVersion() {
+		this._apiVersion = API.defaultVersion;
+		this._tsserverVersion = undefined;
+	}
 }
 
 
diff --git a/extensions/typescript/src/utils/telemetry.ts b/extensions/typescript/src/utils/telemetry.ts
index ba48b02e8d8..407f385f7b4 100644
--- a/extensions/typescript/src/utils/telemetry.ts
+++ b/extensions/typescript/src/utils/telemetry.ts
@@ -5,6 +5,7 @@
 
 import * as path from 'path';
 import VsCodeTelemetryReporter from 'vscode-extension-telemetry';
+import { IClientVersion } from '../typescriptServiceClient';
 
 interface IPackageInfo {
 	name: string;
@@ -23,8 +24,16 @@ export default class TelemetryReporter {
 		}
 	}
 
+	constructor(private client: IClientVersion) {
+	}
+
 	public logTelemetry(eventName: string, properties?: { [prop: string]: string }) {
 		if (this.reporter) {
+			if (!properties) {
+				properties = {};
+			}
+			properties['version'] = this.client.clientVersion;
+
 			this.reporter.sendTelemetryEvent(eventName, properties);
 		}
 	}