Massachusetts General Hospital completes its acquisition of Cooley Dickinson Hospital

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

The two hospitals have been collaborating for the past 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 last month not to launch a cost and market impact review.

That followed an agreement between Mass. General’s owner, Boston-based Partners HealthCare System, and state Attorney General Martha Coakley’s office that required the Northampton hospital to continue to negotiate separate contracts with health insurers for the next five years. In a statement Monday, the parties said they would seek to lower costs through group purchasing and centralized employee training.

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