diff --git a/lib/tasks/fill_in_content_id_in_list_items.rake b/lib/tasks/fill_in_content_id_in_list_items.rake
new file mode 100644
index 000000000..7ac0fbe60
--- /dev/null
+++ b/lib/tasks/fill_in_content_id_in_list_items.rake
@@ -0,0 +1,15 @@
+desc "Fill in content ids in list items after adding content_id database column."
+task fill_in_content_id_in_list_items: :environment do
+  ListItem.find_each do |list_item|
+    next if list_item.read_attribute(:content_id).present?
+
+    base_path = list_item.base_path
+    list_item.content_id = list_item.list.tag.tagged_document_for_base_path(base_path)&.content_id
+
+    unless list_item.read_attribute(:content_id).present? && list_item.save
+      puts "Could not set content_id of the following list item: #{list_item.id} #{list_item.base_path} #{list_item.title}"
+    end
+  rescue StandardError => e
+    puts "Exception #{e} raised when trying to set content_id of the following list item: #{list_item.id} #{list_item.base_path} #{list_item.title}"
+  end
+end