Many of our primary care practices see patients of all ages, however, some see only adults 18 years or older. These are indicated by an asterisk * Amherst Medical Associates 170 University Drive Amherst, MA 01002 413-549-7080 . Atwood Internal Medicine* 22 Atwood Drive Northampton, MA 01060 Phone: 413- 582-1847 Fax: 413-923-9318.