Springfield area

Baystate Franklin Medical Center
Baystate Medical Center
Baystate Noble Hospital
Baystate Wing Hospital
Cooley Dickinson Hospital
Holyoke Medical Center
Mercy Medical Center

Worcester area

Athol Memorial Hospital
Clinton Hospital
Harrington Hospital
HealthAlliance Hospital
Heywood Hospital
Marlborough Hospital
Milford Regional Medical Center
Saint Vincent Hospital
UMASS Memorial Medical Center 

Berkshire County

Berkshire Medical Center
Fairview Hospital
North Adams Regional Hospital Corporation

Connecticut

Connecticut Children's Medical Center (pediatric specialty care only)