group-page.php-FIXED CODE

<div class="columns large-8 medium-8">
    <div class="service">
        <div class="service-box">
            <div class="service-body">
            <h2>Diagnostic Test Category</h2>
                <ul class="diagnosis_test">
                    <?php
                        $args = array( 'hide_empty' => false );
                        $terms = get_terms( 'health_category', $args );
                        if ( ! empty( $terms ) && ! is_wp_error( $terms ) ) {
                            $count = count( $terms );
                                $i = 0;
                                $term_list = '';
                                foreach ( $terms as $term ) {
                                    $term_list .= '<li><a href="' . get_term_link( $term ) . '" title="' . sprintf( __( 'View all post filed under %s', 'my_localization_domain' ), $term->name ) . '">' . $term->name . '</a></li>';
                            }
                            echo $term_list;
                    } ?>
                </ul>

            </div>
        </div>
    </div>
</div>