diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 09cc24e..cba665a 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1044,9 +1044,9 @@ export function App() {
       });
   }, [handleNPCHeroUpdated]);
 
-  const handleNPCHeal = useCallback((_npc: NPCData) => {
+  const handleNPCHeal = useCallback((npc: NPCData) => {
     const telegramId = getTelegramUserId() ?? 1;
-    healAtNPC(telegramId)
+    healAtNPC(telegramId, npc.id)
       .then((hero) => {
         hapticImpact('medium');
         setToast({ message: tr.healedToFull, color: '#44cc44' });
diff --git a/frontend/src/network/api.ts b/frontend/src/network/api.ts
index a068dc6..7d1a520 100644
--- a/frontend/src/network/api.ts
+++ b/frontend/src/network/api.ts
@@ -549,10 +549,10 @@ export async function buyPotion(telegramId?: number): Promise<HeroResponse> {
   return apiPost<HeroResponse>(`/hero/npc-buy-potion${query}`);
 }
 
-/** Heal to full at a healer NPC (matches backend POST /api/v1/hero/npc-heal) */
-export async function healAtNPC(telegramId?: number): Promise<HeroResponse> {
+/** Heal to full at a healer NPC (matches backend POST /api/v1/hero/npc-heal; body must be JSON with npcId) */
+export async function healAtNPC(telegramId?: number, npcId?: number): Promise<HeroResponse> {
   const query = telegramId != null ? `?telegramId=${telegramId}` : '';
-  return apiPost<HeroResponse>(`/hero/npc-heal${query}`);
+  return apiPost<HeroResponse>(`/hero/npc-heal${query}`, { npcId: npcId ?? 0 });
 }
 
 // ---- NPC Proximity & Interaction ----
diff --git a/frontend/src/ui/NPCDialog.tsx b/frontend/src/ui/NPCDialog.tsx
index 504fff3..da477cc 100644
--- a/frontend/src/ui/NPCDialog.tsx
+++ b/frontend/src/ui/NPCDialog.tsx
@@ -329,7 +329,7 @@ export function NPCDialog({
       onToast(tr.notEnoughGold, '#ff4444');
       return;
     }
-    healAtNPC(telegramId)
+    healAtNPC(telegramId, npc.id)
       .then((hero) => {
         hapticImpact('medium');
         onToast(tr.healedToFull, '#44cc44');
@@ -339,7 +339,7 @@ export function NPCDialog({
         console.warn('[NPCDialog] Failed to heal:', err);
         onToast(tr.failedToHeal, '#ff4444');
       });
-  }, [telegramId, heroGold, onHeroUpdated, onToast]);
+  }, [telegramId, heroGold, onHeroUpdated, onToast, npc.id]);
 
   // Quests relevant to this NPC
   const npcHeroQuests = heroQuests.filter(