Loosening their grip;
<h3>As HMOs' popularity continues to erode, more plans turn to less-restrictive rules. But with costs rising, what's next?</h3><p class="source">Modern Healthcare</p>
<p>It has been two years since UnitedHealth Group essentially ripped up the managed-care rule book by shedding its preapproval requirements and granting doctors final say over how they treat their patients.</p>
