Exclude a category id from category collection in Magento

Please use the below code for exclude a category id from category collection in Magento

<?php
      $allCategories = Mage::getModel('catalog/category')
                       ->getCollection()
                       ->addAttributeToSelect('*')
                       ->addAttributeToFilter('level',2)
                       ->addAttributeToFilter('entity_id', array('nin' => 69))
                       ->addIsActiveFilter(); 

?>