diff --git a/src/FHIR/Organization.php b/src/FHIR/Organization.php
index 1f5931d..6c44b98 100644
--- a/src/FHIR/Organization.php
+++ b/src/FHIR/Organization.php
@@ -140,6 +140,18 @@ public function addAddress($address_line = null, $postal_code = null, $city_name
 
     public function json()
     {
+        // Add Organization type
+        if (!array_key_exists('type', $this->organization)) {
+            $this->organization['type'][] = [
+                'coding' => [
+                    [
+                        'system' => 'http://terminology.hl7.org/CodeSystem/organization-type',
+                        'code' => 'dept',
+                        'display' => 'Hospital Department',
+                    ],
+                ],
+            ];
+        }
 
         // Identifier is required
         if (!array_key_exists('identifier', $this->organization)) {