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Cooley Dickinson Hospital is part of MGH

Cooley Dickinson Hospital in Northampton officially became part of Massachusetts General Hospital in Boston on Monday when the hospitals completed their merger.

They have been collaborating for four years on cancer care and other clinical programs. Their plan to expand that partnership into a full acquisition, with Mass. General becoming sole corporate owner of Cooley Dickinson, went forward after the state’s new Health Policy Commission decided not to launch a cost-and- market-impact review.

That followed an agreement between Mass. General’s owner, Boston-based Partners HealthCare System, and Attorney General Martha Coakley that required the Northampton hospital to continue to negotiate separate contracts with health insurers for five years.

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On Monday, the parties said they would seek to lower costs through group purchasing and centralized training.

Robert Weisman