The Centers for Medicare & Medicaid Services (CMS) evaluates Medicare Advantage and Part D plans annually using a rigorous 5-star quality rating system. Top-performing national and regional organizations achieving the rare 5-star status include specific contracts managed by Devoted Health, UnitedHealth Group, Kaiser Permanente, Alignment Healthcare, and Elevance Health, alongside select local health maintenance organizations that excel in clinical outcomes, preventive care, and member satisfaction.