U.S. spending on health care grew 3.9% in 2011, marking the third straight year of record-low growth, the Centers for Medicare & Medicaid Services reported today in Health Affairs. Growth in spending for hospital care slowed to 4.3% from 4.9% in 2010, due to slower growth in hospital prices, use of hospital services and Medicaid spending for hospital care, CMS said. Spending for physician and clinical services accelerated, to 4.3% from 3.1% in 2010. Medicare spending increased 6.2%, up from 4.3% in 2010, while Medicare enrollment increased 2.5% as the first baby boomers became eligible for the program. Spending for private health insurance increased 3.8%, up from 3.4% in 2010, while out-of-pocket spending increased 2.8%.