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How Population Health Is Driving Merger Mania Among Anthem, Cigna and the Rest of the Big Insurers
The Health Care Blog

The nation’s Big 5 health insurers have thrived under the Affordable Care Act, seeing their profits grow and their stock prices soar.

They also continue to dwarf their main sparring partners—hospital systems—in size. Consider that the largest health insurer, United Health Group, has annual revenue of $130 billion, while revenue at the largest hospital system, HCA, is a tick under $37 billion.