diff --git a/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/IRadioImsIndication.aidl b/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/IRadioImsIndication.aidl
index f6d5bc4..63f29f3 100644
--- a/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/IRadioImsIndication.aidl
+++ b/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/IRadioImsIndication.aidl
@@ -36,5 +36,5 @@
 interface IRadioImsIndication {
   oneway void onConnectionSetupFailure(in android.hardware.radio.RadioIndicationType type, in String token, in android.hardware.radio.ims.ConnectionFailureInfo info);
   oneway void notifyAnbr(in android.hardware.radio.RadioIndicationType type, in android.hardware.radio.ims.ImsStreamType mediaType, in android.hardware.radio.ims.ImsStreamDirection direction, int bitsPerSecond);
-  oneway void triggerImsDeregistration(in android.hardware.radio.RadioIndicationType type);
+  oneway void triggerImsDeregistration(in android.hardware.radio.RadioIndicationType type, in android.hardware.radio.ims.ImsDeregistrationReason reason);
 }
diff --git a/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/ImsDeregistrationReason.aidl b/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/ImsDeregistrationReason.aidl
new file mode 100644
index 0000000..330374e
--- /dev/null
+++ b/radio/aidl/aidl_api/android.hardware.radio.ims/current/android/hardware/radio/ims/ImsDeregistrationReason.aidl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.radio.ims;
+@Backing(type="int") @JavaDerive(toString=true) @VintfStability
+enum ImsDeregistrationReason {
+  REASON_SIM_REMOVED = 1,
+  REASON_SIM_REFRESH = 2,
+  REASON_NETWORK_MODE_CHANGED = 3,
+}
diff --git a/radio/aidl/android/hardware/radio/ims/IRadioImsIndication.aidl b/radio/aidl/android/hardware/radio/ims/IRadioImsIndication.aidl
index 7a8cc0e..ea286c4 100644
--- a/radio/aidl/android/hardware/radio/ims/IRadioImsIndication.aidl
+++ b/radio/aidl/android/hardware/radio/ims/IRadioImsIndication.aidl
@@ -18,6 +18,7 @@
 
 import android.hardware.radio.RadioIndicationType;
 import android.hardware.radio.ims.ConnectionFailureInfo;
+import android.hardware.radio.ims.ImsDeregistrationReason;
 import android.hardware.radio.ims.ImsStreamDirection;
 import android.hardware.radio.ims.ImsStreamType;
 
@@ -60,6 +61,7 @@
      * the network detach procedure.
      *
      * @param type Type of radio indication
+     * @param reason the reason why the deregistration is triggered
      */
-     void triggerImsDeregistration(in RadioIndicationType type);
+     void triggerImsDeregistration(in RadioIndicationType type, in ImsDeregistrationReason reason);
 }
diff --git a/radio/aidl/android/hardware/radio/ims/ImsDeregistrationReason.aidl b/radio/aidl/android/hardware/radio/ims/ImsDeregistrationReason.aidl
new file mode 100644
index 0000000..83c0321
--- /dev/null
+++ b/radio/aidl/android/hardware/radio/ims/ImsDeregistrationReason.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.radio.ims;
+
+@VintfStability
+@JavaDerive(toString=true)
+@Backing(type="int")
+enum ImsDeregistrationReason {
+    /**
+     * Radio shall send this reason to IMS stack to perform graceful de-registration
+     * due to SIM card is removed.
+     */
+    REASON_SIM_REMOVED = 1,
+    /**
+     * Radio shall send this reason to IMS stack to perform graceful de-registration
+     * due to SIM refresh that needs a NAS detach and re-attach.
+     */
+    REASON_SIM_REFRESH = 2,
+    /**
+     * Radio shall send this reason to IMS stack to perform graceful de-registration
+     * due to allowed network types bitmask changed that results in NAS detach.
+     */
+    REASON_NETWORK_MODE_CHANGED = 3,
+}
diff --git a/radio/aidl/vts/radio_ims_indication.cpp b/radio/aidl/vts/radio_ims_indication.cpp
index 0637813..8e98d85 100644
--- a/radio/aidl/vts/radio_ims_indication.cpp
+++ b/radio/aidl/vts/radio_ims_indication.cpp
@@ -28,6 +28,7 @@
     return ndk::ScopedAStatus::ok();
 }
 
-ndk::ScopedAStatus RadioImsIndication::triggerImsDeregistration(RadioIndicationType /*type*/) {
+ndk::ScopedAStatus RadioImsIndication::triggerImsDeregistration(RadioIndicationType /*type*/,
+        ImsDeregistrationReason /*reason*/) {
     return ndk::ScopedAStatus::ok();
 }
\ No newline at end of file
diff --git a/radio/aidl/vts/radio_ims_utils.h b/radio/aidl/vts/radio_ims_utils.h
index c9ecf4a..e829e43 100644
--- a/radio/aidl/vts/radio_ims_utils.h
+++ b/radio/aidl/vts/radio_ims_utils.h
@@ -66,7 +66,8 @@
     virtual ndk::ScopedAStatus notifyAnbr(RadioIndicationType type, ImsStreamType mediaType,
             ImsStreamDirection direction, int bitsPerSecond) override;
 
-    virtual ndk::ScopedAStatus triggerImsDeregistration(RadioIndicationType type) override;
+    virtual ndk::ScopedAStatus triggerImsDeregistration(RadioIndicationType type,
+            ImsDeregistrationReason reason) override;
 };
 
 // The main test class for Radio AIDL Ims.