(Bloomberg) —  The biggest overhaul of the U.S. health care system in 50 years has spawned one of the most complex computer projects in the government’s history.

Dubbed the Hub, the $267 million computer system built by a unit of UnitedHealth Group Inc. is one of the most important determiners of whether the Affordable Care Act succeeds. The hub ties together the databases of seven U.S. agencies, ranging from the Internal Revenue Service to the Peace Corps, to determine which Americans can buy medical coverage and get U.S. subsidies through the new government-run insurance exchanges.

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