Health insurers across the country have been proposing particularly high premium rate increases for 2026 Affordable Care Act (ACA) marketplace plans, according to two health policy research organizations. The range of requested rate changes varied from cost reductions, as low as -10 percent, to price hikes as high a 59 percent, while the average proposal was an increase between 12 to 27 percent, says data from the 'Health System Tracker' put together by the Peterson Center on Healthcare and KFF.