diff --git a/telephony/java/android/telephony/euicc/EuiccManager.java b/telephony/java/android/telephony/euicc/EuiccManager.java
index 96a2514e8ff06..cabd4dfd91f14 100644
--- a/telephony/java/android/telephony/euicc/EuiccManager.java
+++ b/telephony/java/android/telephony/euicc/EuiccManager.java
@@ -333,6 +333,18 @@ public class EuiccManager {
     public static final String EXTRA_FROM_SUBSCRIPTION_ID =
             "android.telephony.euicc.extra.FROM_SUBSCRIPTION_ID";
 
+    /**
+     * Key for an extra set on privileged actions {@link #ACTION_TOGGLE_SUBSCRIPTION_PRIVILEGED}
+     * providing the physical slot ID of the target slot.
+     *
+     * <p>Expected type of the extra data: int
+     *
+     * @hide
+     */
+    // TODO: Make this a @SystemApi.
+    public static final String EXTRA_PHYSICAL_SLOT_ID =
+            "android.telephony.euicc.extra.PHYSICAL_SLOT_ID";
+
     /**
      * Optional meta-data attribute for a carrier app providing an icon to use to represent the
      * carrier. If not provided, the app's launcher icon will be used as a fallback.