Вроде нет, но можно переделать под себя, вот исходник:
function get_category_parents( $id, $link = false, $separator = '/', $nicename = false, $visited = array() ) {
	$chain = '';
	$parent = get_term( $id, 'category' );
	if ( is_wp_error( $parent ) )
		return $parent;
	if ( $nicename )
		$name = $parent->slug;
	else
		$name = $parent->name;
	if ( $parent->parent && ( $parent->parent != $parent->term_id ) && !in_array( $parent->parent, $visited ) ) {
		$visited[] = $parent->parent;
		$chain .= get_category_parents( $parent->parent, $link, $separator, $nicename, $visited );
	}
	if ( $link )
		$chain .= '<a href="' . esc_url( get_category_link( $parent->term_id ) ) . '">'.$name.'</a>' . $separator;
	else
		$chain .= $name.$separator;
	return $chain;
}