The Food and Drug Administration's guidance on who needs the COVID-19 booster shot has changed, but many insurers will still be covering the costs for enrollees-at least through the end of the year. AHIP (formerly known as America's Health Insurance Plans), the largest U.S. health insurance association, said Tuesday that its members will continue to cover vaccines with no cost-sharing for patients, following recommendations issued by the Centers for Disease Control and Prevention's vaccine advisory committee as of September 1.