CHICAGO — Michigan-based Trinity Health, one of the nation’s largest Catholic health care systems, will invest up to $150 million over the next five years as part of its acquisition of Mercy Health System if the deal is approved by an Illinois review board.

If the transaction closes, it will be Trinity’s second acquisition of a Chicago-area hospital in a year. The system acquired Loyola University Health System in July 2011. Trinity agreed to invest $400 million through 2018 in Loyola as part of that deal.

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