diff -u b/src/Form/RegcodeOperationsForm.php b/src/Form/RegcodeOperationsForm.php
--- b/src/Form/RegcodeOperationsForm.php
+++ b/src/Form/RegcodeOperationsForm.php
@@ -149,10 +149,18 @@
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
-    if (empty($form_state->getValue('count'))
+    $count = $form_state->getValue('count');
+    $regcode = $form_state->getValue('regcode');
+    if (empty($count)
       && $form_state->getValue('operation') === 'delete_uses') {
       $form_state->setErrorByName('count', $this->t('Count of items should not be empty'));
     }
+    if (!empty($regcode)) {
+      $code = regcode_load_single($regcode);
+      if ($code->maxuses < $count) {
+        $form_state->setErrorByName('count', $this->t('Count of items should not be bigger than max usage'));
+      }
+    }
   }
 
   /**