diff --git a/UAT_PLAYBOOK.md b/UAT_PLAYBOOK.md
index cb02d20..d5887c6 100644
--- a/UAT_PLAYBOOK.md
+++ b/UAT_PLAYBOOK.md
@@ -21,6 +21,14 @@ GroomBook API is a Hono-based REST service (TypeScript/Node.js) powering the pet
 
 ## Test Cases
 
+### 4.0 Health Check
+
+| # | Scenario | Steps | Expected |
+|---|----------|-------|----------|
+| TC-API-0.1 | Unauthenticated health check | GET /api/health | 200 OK, `{"status":"ok"}` |
+
+> **Note (GRO-1544):** Health endpoint registered on `api` basePath before auth middleware at `/api/health`. The old path `/health` was incorrect (routed to web pod via HTTPRoute `/*` rule).
+
 ### 4.1 Authentication
 
 | # | Scenario | Steps | Expected |
diff --git a/src/index.ts b/src/index.ts
index 6acee60..9ae50b8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -58,8 +58,8 @@ app.use(
   })
 );
 
-// Health check (no auth required)
-app.get("/health", (c) => c.json({ status: "ok" }));
+// Health check — no auth required, registered on app at full path before auth middleware
+app.get("/api/health", (c) => c.json({ status: "ok" }));
 
 // Public booking routes — no auth required, must be registered before auth middleware
 app.route("/api/book", bookRouter);