diff --git a/README.md b/README.md
index cdaa37aa..139f6f8d 100644
--- a/README.md
+++ b/README.md
@@ -1122,6 +1122,35 @@ provides a list of implementations to choose from.
 
 Supported in filetypes: `cs`
 
+Functions
+--------
+
+### The `youcompleteme#GetErrorCount` function
+
+Get the number of YCM Diagnostic errors. If no errors are present, this function
+returns 0.
+
+For example:
+```viml
+  call youcompleteme#GetErrorCount()
+```
+
+Both this function and `youcompleteme#GetWarningCount` can be useful when
+integrating YCM with other Vim plugins. For example, a [lightline][] user could
+add a diagnostics section to their statusline which would display the number of
+errors and warnings.
+
+### The `youcompleteme#GetWarningCount` function
+
+Get the number of YCM Diagnostic warnings. If no warnings are present, this
+function returns 0.
+
+For example:
+```viml
+  call youcompleteme#GetWarningCount()
+```
+
+
 Options
 -------
 
@@ -2349,6 +2378,7 @@ This software is licensed under the [GPL v3 license][gpl].
 [gpl]: http://www.gnu.org/copyleft/gpl.html
 [vim]: http://www.vim.org/
 [syntastic]: https://github.com/scrooloose/syntastic
+[lightline]: https://github.com/itchyny/lightline.vim
 [flags_example]: https://github.com/Valloric/ycmd/blob/master/cpp/ycm/.ycm_extra_conf.py
 [compdb]: http://clang.llvm.org/docs/JSONCompilationDatabase.html
 [subsequence]: https://en.wikipedia.org/wiki/Subsequence
diff --git a/autoload/youcompleteme.vim b/autoload/youcompleteme.vim
index 0714cdae..9158331f 100644
--- a/autoload/youcompleteme.vim
+++ b/autoload/youcompleteme.vim
@@ -111,6 +111,16 @@ function! youcompleteme#DisableCursorMovedAutocommands()
 endfunction
 
 
+function! youcompleteme#GetErrorCount()
+  return pyeval( 'ycm_state.GetErrorCount()' )
+endfunction
+
+
+function! youcompleteme#GetWarningCount()
+  return pyeval( 'ycm_state.GetWarningCount()' )
+endfunction
+
+
 function! s:SetUpPython() abort
 python << EOF
 import sys
diff --git a/doc/youcompleteme.txt b/doc/youcompleteme.txt
index 10dbce73..6c0ce1f1 100644
--- a/doc/youcompleteme.txt
+++ b/doc/youcompleteme.txt
@@ -55,7 +55,10 @@ Contents ~
   14. The |ReloadSolution| subcommand
   15. The |GoToImplementation| subcommand
   16. The |GoToImplementationElseDeclaration| subcommand
- 8. Options                                             |youcompleteme-options|
+ 8. Functions                                         |youcompleteme-functions|
+  1. The |youcompleteme#GetErrorCount| function
+  2. The |youcompleteme#GetWarningCount| function
+ 9. Options                                             |youcompleteme-options|
   1. The |g:ycm_min_num_of_chars_for_completion| option
   2. The |g:ycm_min_num_identifier_candidate_chars| option
   3. The |g:ycm_auto_trigger| option
@@ -101,7 +104,7 @@ Contents ~
   43. The |g:ycm_use_ultisnips_completer| option
   44. The |g:ycm_goto_buffer_command| option
   45. The |g:ycm_disable_for_files_larger_than_kb| option
- 9. FAQ                                                     |youcompleteme-faq|
+ 10. FAQ                                                    |youcompleteme-faq|
   1. I used to be able to 'import vim' in '.ycm_extra_conf.py', but now can't |import-vim|
   2. On very rare occasions Vim crashes when I tab through the completion menu |youcompleteme-on-very-rare-occasions-vim-crashes-when-i-tab-through-completion-menu|
   3. I get a linker warning regarding |libpython| on Mac when compiling YCM
@@ -1228,9 +1231,9 @@ For example:
   class C {
       void f();
   };
-  
+
   void C::f() {
-  
+
   }
 <
 In the out-of-line definition of 'C::f', the semantic parent is the class 'C',
@@ -1346,6 +1349,35 @@ provides a list of implementations to choose from.
 
 Supported in filetypes: 'cs'
 
+===============================================================================
+                                                      *youcompleteme-functions*
+Functions ~
+
+-------------------------------------------------------------------------------
+The *youcompleteme#GetErrorCount* function
+
+Get the number of YCM Diagnostic errors. If no errors are present, this
+function returns 0.
+
+For example:
+>
+  call youcompleteme#GetErrorCount()
+<
+Both this function and |youcompleteme#GetWarningCount| can be useful when
+integrating YCM with other Vim plugins. For example, a lightline [48] user
+could add a diagnostics section to their statusline which would display the
+number of errors and warnings.
+
+-------------------------------------------------------------------------------
+The *youcompleteme#GetWarningCount* function
+
+Get the number of YCM Diagnostic warnings. If no warnings are present, this
+function returns 0.
+
+For example:
+>
+  call youcompleteme#GetWarningCount()
+<
 ===============================================================================
                                                         *youcompleteme-options*
 Options ~
@@ -2600,5 +2632,6 @@ References ~
 [45] http://www.gnu.org/copyleft/gpl.html
 [46] https://bitdeli.com/free
 [47] https://d2weczhvl823v0.cloudfront.net/Valloric/youcompleteme/trend.png
+[48] https://github.com/itchyny/lightline.vim
 
 vim: ft=help
diff --git a/python/ycm/diagnostic_interface.py b/python/ycm/diagnostic_interface.py
index 52afae28..317c6095 100644
--- a/python/ycm/diagnostic_interface.py
+++ b/python/ycm/diagnostic_interface.py
@@ -43,6 +43,15 @@ class DiagnosticInterface( object ):
       if self._user_options[ 'echo_current_diagnostic' ]:
         self._EchoDiagnosticForLine( line )
 
+
+  def GetErrorCount( self ):
+    return len( self._FilterDiagnostics( _DiagnosticIsError ) )
+
+
+  def GetWarningCount( self ):
+    return len( self._FilterDiagnostics( _DiagnosticIsWarning ) )
+
+
   def UpdateWithNewDiagnostics( self, diags ):
     normalized_diags = [ _NormalizeDiagnostic( x ) for x in diags ]
     self._buffer_number_to_line_to_diags = _ConvertDiagListToDict(
@@ -79,6 +88,16 @@ class DiagnosticInterface( object ):
     self._diag_message_needs_clearing = True
 
 
+  def _FilterDiagnostics( self, predicate ):
+    matched_diags = []
+    line_to_diags = self._buffer_number_to_line_to_diags[
+      vim.current.buffer.number ]
+
+    for diags in line_to_diags.itervalues():
+      matched_diags.extend( filter( predicate, diags ) )
+    return matched_diags
+
+
 def _UpdateSquiggles( buffer_number_to_line_to_diags ):
   vimsupport.ClearYcmSyntaxMatches()
   line_to_diags = buffer_number_to_line_to_diags[ vim.current.buffer.number ]
@@ -209,6 +228,10 @@ def _DiagnosticIsError( diag ):
   return diag[ 'kind' ] == 'ERROR'
 
 
+def _DiagnosticIsWarning( diag ):
+  return diag[ 'kind' ] == 'WARNING'
+
+
 def _NormalizeDiagnostic( diag ):
   def ClampToOne( value ):
     return value if value > 0 else 1
diff --git a/python/ycm/youcompleteme.py b/python/ycm/youcompleteme.py
index 77b81a0a..78544a8c 100644
--- a/python/ycm/youcompleteme.py
+++ b/python/ycm/youcompleteme.py
@@ -451,6 +451,11 @@ class YouCompleteMe( object ):
       return None
     return completion[ "extra_data" ][ "required_namespace_import" ]
 
+  def GetErrorCount( self ):
+    return self._diag_interface.GetErrorCount()
+
+  def GetWarningCount( self ):
+    return self._diag_interface.GetWarningCount()
 
   def DiagnosticsForCurrentFileReady( self ):
     return bool( self._latest_file_parse_request and