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One of the least-known but most important aspects of the Affordable Care Act is the Medical Loss Ratio:

The Affordable Care Act (ACA) includes several provisions that change the way private health insurance is regulated in an effort to provide better value to consumers and increase transparency. One such provision – the Medical Loss Ratio (or MLR) requirement – limits the portion of premium dollars health insurers may spend on administration, marketing, and profits. Under health care reform, health insurers must publicly report the portion of premium dollars spent on health care and quality improvement and other activities in each state they operate. Insurers failing to meet the applicable MLR standard must pay rebates to consumers beginning in 2012.