The U.S. Department of Health and Human Services has postponed a July 10 in-person meeting of the U.S. Preventive Services Task Force, the 16-member panel that determines which screenings, vaccines and other preventive services must be covered by insurers at no out-of-pocket cost under the Affordable Care Act. An email from Secretary Robert F. Kennedy Jr.’s office informed members that the session would not take place, without providing a reason. Public-health experts said the move raises doubts about the task force’s independence. Kennedy last month dismissed all 17 members of the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices and quickly installed several new appointees who have questioned vaccine safety. The abrupt postponement of the USPSTF meeting has fueled speculation that the secretary may similarly seek to reshape or replace the preventive-care panel. Concerns have intensified since a Supreme Court ruling in June upheld the constitutionality of the task force while confirming that the HHS secretary may hire and fire its members and review its recommendations. More than 100 medical organizations, including the American Medical Association and the American Academy of Pediatrics, have urged the Senate Health, Education, Labor and Pensions Committee to safeguard the panel’s procedures, warning that political interference could restrict patient access to cost-free preventive care and disrupt insurer coverage rules.