diff --git a/app/helpers/human_diseases_helper.rb b/app/helpers/human_diseases_helper.rb
index e355dd9f0d..14d0b20e33 100644
--- a/app/helpers/human_diseases_helper.rb
+++ b/app/helpers/human_diseases_helper.rb
@@ -58,19 +58,27 @@ def get_transitive_related_resources(resource, limit = nil)
   end
 
   def get_human_diseases_plot_data()
-    Rails.cache.fetch('human_diseases_plot_data', expires_in: 12.hours) do
-      HumanDisease.all.order(:id).map do |c|
-        {
-          id:           c.id.to_s,
-          title:        c.title,
-          parent:       c.parents.first ? c.parents.first.id.to_s : '',
-          projects:     c.projects.count,
-          # assays:       c.assays.count, # currently not in use
-          publications: c.publications.count,
-          models:       c.models.count,
-          data_files:   c.data_files.count,
-        }
-      end
+    Rails.cache.fetch('human_diseases_data', expires_in: 12.hours) do
+      {
+        tagged:
+          HumanDisease.all.order(:id).map do |c|
+            {
+              id:           c.id.to_s,
+              title:        c.title,
+              parent:       c.parents.first ? c.parents.first.id.to_s : '',
+              projects:     c.projects.count,
+              publications: c.publications.count,
+              models:       c.models.count,
+              data_files:   c.data_files.count,
+            }
+          end,
+        untagged: {
+          projects:     Project.left_outer_joins(:human_diseases).where(human_diseases: { id: nil }).count(),
+          publications: Publication.left_outer_joins(:human_diseases).where(human_diseases: { id: nil }).count(),
+          models:       Model.where(human_disease: nil).count(),
+          data_files:   DataFile.left_outer_joins(:human_diseases).where(human_diseases: { id: nil }).count(),
+        },
+      }
     end
   end
 end
diff --git a/app/views/human_diseases/_overview_plot.html.erb b/app/views/human_diseases/_overview_plot.html.erb
index 1725ef9f1c..4cc1690add 100644
--- a/app/views/human_diseases/_overview_plot.html.erb
+++ b/app/views/human_diseases/_overview_plot.html.erb
@@ -1,5 +1,7 @@
 <%
-  dataframe = get_human_diseases_plot_data()
+  data     = get_human_diseases_plot_data()
+  tagged   = data[:tagged]
+  untagged = data[:untagged]
 %>
 
 <div class="row hidden-xs hidden-sm">
@@ -10,6 +12,10 @@
       </div>
       <div class="panel-body">
         <div id="human-disease-graph"></div>
+        <small class="text-muted">
+          Untagged:<br>
+          <%= untagged.map{ |key, value| key.to_s.humanize + ': ' + value.to_s }.join(', ') %>
+        </small>
       </div>
     </div>
   </div>
@@ -32,11 +38,11 @@
     <% plots.each do |plot| %>
       {
         type: 'sunburst',
-        ids:       [ <%== dataframe.map{ |c| '"' + c[:id]     + '"' }.join(', ') %> ],
-        labels:    [ <%== dataframe.map{ |c| '"' +            + '"' }.join(', ') %> ],
-        parents:   [ <%== dataframe.map{ |c| '"' + c[:parent] + '"' }.join(', ') %> ],
-        values:    [ <%== dataframe.map{ |c|       c[plot[:key]]    }.join(', ') %> ],
-        hovertext: [ <%== dataframe.map{ |c| '"' + c[:title]  + '"' }.join(', ') %> ],
+        ids:       [ <%== tagged.map{ |c| '"' + c[:id]     + '"' }.join(', ') %> ],
+        labels:    [ <%== tagged.map{ |c| '"' +            + '"' }.join(', ') %> ],
+        parents:   [ <%== tagged.map{ |c| '"' + c[:parent] + '"' }.join(', ') %> ],
+        values:    [ <%== tagged.map{ |c|       c[plot[:key]]    }.join(', ') %> ],
+        hovertext: [ <%== tagged.map{ |c| '"' + c[:title]  + '"' }.join(', ') %> ],
         outsidetextfont: { size: 20, color: '#377eb8' },
         leaf: { opacity: 1 },
         marker: { line: { width: 2 } },