CHICAGO — Moody's Investors Service has revised its outlook to negative from positive on Edward Health Services Corp.'s A2 rating due to challenges posed by its new affiliation with Elmhurst Memorial Healthcare.

The action impacts $244 million of rated debt. Edward is based in the far western suburb of Naperville and Elmhurst is located in the western suburb of Elmhurst. The two formally decided to strike an affiliation in April.

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