diff --git a/homeassistant/components/simplisafe/__init__.py b/homeassistant/components/simplisafe/__init__.py
index 9a0566531c3..f5a8df0d652 100644
--- a/homeassistant/components/simplisafe/__init__.py
+++ b/homeassistant/components/simplisafe/__init__.py
@@ -449,6 +449,7 @@ class SimpliSafe:
         self._websocket_reconnect_task: asyncio.Task | None = None
         self.entry = entry
         self.initial_event_to_use: dict[int, dict[str, Any]] = {}
+        self.subscription_data: dict[int, Any] = api.subscription_data
         self.systems: dict[int, SystemType] = {}
 
         # This will get filled in by async_init:
diff --git a/homeassistant/components/simplisafe/diagnostics.py b/homeassistant/components/simplisafe/diagnostics.py
index bc0dddef47c..c7c03467c94 100644
--- a/homeassistant/components/simplisafe/diagnostics.py
+++ b/homeassistant/components/simplisafe/diagnostics.py
@@ -11,14 +11,28 @@ from homeassistant.core import HomeAssistant
 from . import SimpliSafe
 from .const import DOMAIN
 
+CONF_CREDIT_CARD = "creditCard"
+CONF_EXPIRES = "expires"
+CONF_LOCATION = "location"
+CONF_LOCATION_NAME = "locationName"
+CONF_PAYMENT_PROFILE_ID = "paymentProfileId"
 CONF_SERIAL = "serial"
+CONF_SID = "sid"
 CONF_SYSTEM_ID = "system_id"
+CONF_UID = "uid"
 CONF_WIFI_SSID = "wifi_ssid"
 
 TO_REDACT = {
     CONF_ADDRESS,
+    CONF_CREDIT_CARD,
+    CONF_EXPIRES,
+    CONF_LOCATION,
+    CONF_LOCATION_NAME,
+    CONF_PAYMENT_PROFILE_ID,
     CONF_SERIAL,
+    CONF_SID,
     CONF_SYSTEM_ID,
+    CONF_UID,
     CONF_WIFI_SSID,
 }
 
@@ -34,6 +48,7 @@ async def async_get_config_entry_diagnostics(
             "entry": {
                 "options": dict(entry.options),
             },
+            "subscription_data": simplisafe.subscription_data,
             "systems": [system.as_dict() for system in simplisafe.systems.values()],
         },
         TO_REDACT,
diff --git a/tests/components/simplisafe/conftest.py b/tests/components/simplisafe/conftest.py
index d9e6d46c2eb..d4517717434 100644
--- a/tests/components/simplisafe/conftest.py
+++ b/tests/components/simplisafe/conftest.py
@@ -18,11 +18,12 @@ USER_ID = "12345"
 
 
 @pytest.fixture(name="api")
-def api_fixture(system_v3, websocket):
+def api_fixture(data_subscription, system_v3, websocket):
     """Define a fixture for a simplisafe-python API object."""
     return Mock(
         async_get_systems=AsyncMock(return_value={SYSTEM_ID: system_v3}),
         refresh_token=REFRESH_TOKEN,
+        subscription_data=data_subscription,
         user_id=USER_ID,
         websocket=websocket,
     )
diff --git a/tests/components/simplisafe/test_diagnostics.py b/tests/components/simplisafe/test_diagnostics.py
index d2c2866bf5b..13d5c778e89 100644
--- a/tests/components/simplisafe/test_diagnostics.py
+++ b/tests/components/simplisafe/test_diagnostics.py
@@ -7,7 +7,96 @@ from tests.components.diagnostics import get_diagnostics_for_config_entry
 async def test_entry_diagnostics(hass, config_entry, hass_client, setup_simplisafe):
     """Test config entry diagnostics."""
     assert await get_diagnostics_for_config_entry(hass, hass_client, config_entry) == {
-        "entry": {"options": {}},
+        "entry": {
+            "options": {},
+        },
+        "subscription_data": {
+            "system_123": {
+                "uid": REDACTED,
+                "sid": REDACTED,
+                "sStatus": 20,
+                "activated": 1445034752,
+                "planSku": "SSEDSM2",
+                "planName": "Interactive Monitoring",
+                "price": 24.99,
+                "currency": "USD",
+                "country": "US",
+                "expires": REDACTED,
+                "canceled": 0,
+                "extraTime": 0,
+                "creditCard": REDACTED,
+                "time": 2628000,
+                "paymentProfileId": REDACTED,
+                "features": {
+                    "monitoring": True,
+                    "alerts": True,
+                    "online": True,
+                    "hazard": True,
+                    "video": True,
+                    "cameras": 10,
+                    "dispatch": True,
+                    "proInstall": False,
+                    "discount": 0,
+                    "vipCS": False,
+                    "medical": True,
+                    "careVisit": False,
+                    "storageDays": 30,
+                },
+                "status": {
+                    "hasBaseStation": True,
+                    "isActive": True,
+                    "monitoring": "Active",
+                },
+                "subscriptionFeatures": {
+                    "monitoredSensorsTypes": [
+                        "Entry",
+                        "Motion",
+                        "GlassBreak",
+                        "Smoke",
+                        "CO",
+                        "Freeze",
+                        "Water",
+                    ],
+                    "monitoredPanicConditions": ["Fire", "Medical", "Duress"],
+                    "dispatchTypes": ["Police", "Fire", "Medical", "Guard"],
+                    "remoteControl": [
+                        "ArmDisarm",
+                        "LockUnlock",
+                        "ViewSettings",
+                        "ConfigureSettings",
+                    ],
+                    "cameraFeatures": {
+                        "liveView": True,
+                        "maxRecordingCameras": 10,
+                        "recordingStorageDays": 30,
+                        "videoVerification": True,
+                    },
+                    "support": {
+                        "level": "Basic",
+                        "annualVisit": False,
+                        "professionalInstall": False,
+                    },
+                    "cellCommunicationBackup": True,
+                    "alertChannels": ["Push", "SMS", "Email"],
+                    "alertTypes": ["Alarm", "Error", "Activity", "Camera"],
+                    "alarmModes": ["Alarm", "SecretAlert", "Disabled"],
+                    "supportedIntegrations": [
+                        "GoogleAssistant",
+                        "AmazonAlexa",
+                        "AugustLock",
+                    ],
+                    "timeline": {},
+                },
+                "dispatcher": "cops",
+                "dcid": 0,
+                "location": REDACTED,
+                "pinUnlocked": True,
+                "billDate": 1602887552,
+                "billInterval": 2628000,
+                "pinUnlockedBy": "pin",
+                "autoActivation": None,
+            }
+        },
         "systems": [
             {
                 "address": REDACTED,
@@ -183,7 +272,7 @@ async def test_entry_diagnostics(hass, config_entry, hass_client, setup_simplisa
                         "shutter_open_when_off": False,
                         "status": "online",
                         "subscription_enabled": True,
-                    },
+                    }
                 ],
                 "chime_volume": 2,
                 "entry_delay_away": 30,