Dartmouth-Hitchcock

DHMC

Dartmouth-Hitchcock and GraniteOne Health, an existing group that includes Catholic Medical Center in Manchester, have signed an agreement to combine under a single new healthcare network.

The formal agreement announced Wednesday would combine more than half-a-dozen hospitals across New Hampshire into a single new healthcare network.

The official agreement comes nine months after the groups signed a letter of intent. The deal will need approval from the state Attorney General’s Charitable Trust Unit and Consumer Protection Bureau as well as the Federal Trade Commission.