Cambridge Health Alliance (CHA) is a healthcare provider in Cambridge, Somerville and Boston's metro-north communities in Massachusetts. CHA offers services including primary care, specialty care, and mental health/substance use services. It includes two acute care hospitals, primary care and specialty practice facilities, and the Cambridge Public Health Department. CHA maintains an affiliation with Beth Israel Deaconess Medical Center in Boston and is a Tufts University School of Medicine and Harvard Medical School teaching affiliate.