diff --git a/app/v2/notifications/notification_schemas.py b/app/v2/notifications/notification_schemas.py
index d0ab58f9c5..ebf4b990d6 100644
--- a/app/v2/notifications/notification_schemas.py
+++ b/app/v2/notifications/notification_schemas.py
@@ -2,8 +2,8 @@
     NOTIFICATION_STATUS_TYPES,
     NOTIFICATION_STATUS_LETTER_ACCEPTED,
     NOTIFICATION_STATUS_LETTER_RECEIVED,
-    TEMPLATE_TYPES
-)
+    TEMPLATE_TYPES,
+    VA_IDENTIFIER_TYPES)
 from app.schema_validation.definitions import (uuid, personalisation, letter_personalisation)
 
 
@@ -136,7 +136,8 @@
         "phone_number": {"type": "string", "format": "phone_number"},
         "va_identifier": {"type": "object", "properties": {
             "id_type": {
-                "type": "string"
+                "type": "string",
+                "enum": VA_IDENTIFIER_TYPES
             },
             "value": {
                 "type": "string"
diff --git a/tests/app/v2/notifications/test_notification_schemas.py b/tests/app/v2/notifications/test_notification_schemas.py
index e8f1b09d2c..75a9186d37 100644
--- a/tests/app/v2/notifications/test_notification_schemas.py
+++ b/tests/app/v2/notifications/test_notification_schemas.py
@@ -5,7 +5,7 @@
 from freezegun import freeze_time
 from jsonschema import ValidationError
 
-from app.models import NOTIFICATION_CREATED, EMAIL_TYPE
+from app.models import NOTIFICATION_CREATED, EMAIL_TYPE, VA_IDENTIFIER_TYPES, VA_PROFILE_ID
 from app.schema_validation import validate
 from app.v2.notifications.notification_schemas import (
     get_notifications_request,
@@ -108,7 +108,7 @@ def test_get_notifications_request_invalid_statuses_and_template_types():
 }
 valid_va_identifier_json = {
     "va_identifier": {
-        "id_type": "foo",
+        "id_type": VA_PROFILE_ID,
         "value": "bar"
     },
     "template_id": str(uuid.uuid4())
@@ -116,7 +116,7 @@ def test_get_notifications_request_invalid_statuses_and_template_types():
 valid_phone_number_and_va_identifier_json = {
     "phone_number": "6502532222",
     "va_identifier": {
-        "id_type": "foo",
+        "id_type": VA_PROFILE_ID,
         "value": "bar"
     },
     "template_id": str(uuid.uuid4())
@@ -135,6 +135,18 @@ def test_post_sms_schema_is_valid(input):
     assert validate(input, post_sms_request_schema) == input
 
 
+@pytest.mark.parametrize("va_identifier_type", VA_IDENTIFIER_TYPES)
+def test_post_sms_schema_id_type_should_only_use_enum_values(va_identifier_type):
+    id_type_as_enum_json = {
+        "va_identifier": {
+            "id_type": va_identifier_type,
+            "value": "bar"
+        },
+        "template_id": str(uuid.uuid4())
+    }
+    assert validate(id_type_as_enum_json, post_sms_request_schema) == id_type_as_enum_json
+
+
 @pytest.mark.parametrize("template_id",
                          ['2ebe4da8-17be-49fe-b02f-dff2760261a0' + "\n",
                           '2ebe4da8-17be-49fe-b02f-dff2760261a0' + " ",
@@ -160,7 +172,7 @@ def test_post_sms_json_schema_bad_uuid(template_id):
 
 
 missing_id_type_json = {"value": "bar"}
-missing_value_json = {"id_type": "foo"}
+missing_value_json = {"id_type": VA_PROFILE_ID}
 missing_id_type_and_value_json = {"invalid_param": "invalid"}
 
 
@@ -169,7 +181,7 @@ def test_post_sms_json_schema_bad_uuid(template_id):
     (missing_value_json, ["value"]),
     (missing_id_type_and_value_json, ["id_type", "value"])
 ])
-def test_post_sms_json_schema_invalid_va_identifier(va_identifier, missing_key_name):
+def test_post_sms_json_schema_missing_va_identifier_required_fields(va_identifier, missing_key_name):
     j = {
         "va_identifier": va_identifier,
         "template_id": str(uuid.uuid4())
@@ -185,6 +197,24 @@ def test_post_sms_json_schema_invalid_va_identifier(va_identifier, missing_key_n
                 'message': "va_identifier " + key_name + " is a required property"} in error['errors']
 
 
+def test_post_sms_json_schema_invalid_va_identifier_id_type():
+    id_type_not_an_accepted_va_identifier_json = {
+        "va_identifier": {
+            "id_type": "foo",
+            "value": "bar",
+        },
+        "template_id": str(uuid.uuid4())
+    }
+    with pytest.raises(ValidationError) as e:
+        validate(id_type_not_an_accepted_va_identifier_json, post_sms_request_schema)
+    error = json.loads(str(e.value))
+    assert len(error.keys()) == 2
+    assert error.get('status_code') == 400
+    assert len(error.get('errors')) == 1
+    assert {'error': 'ValidationError',
+            'message': "va_identifier foo is not one of [va_profile_id, pid, icn]"} in error['errors']
+
+
 def test_post_sms_json_schema_bad_uuid_and_missing_phone_number_and_va_identifier():
     j = {"template_id": "notUUID"}
     with pytest.raises(ValidationError) as e: