Dec 14, 2021 · Valley Medical Group can be contacted through each of our offices listed below. AMHERST MEDICAL CENTER EASTHAMPTON HEALTH CENTER 31 Hall Drive Amherst, MA 01002 Phone (413) 256-8561 Fax 1-866-644-0869 Office Hours: Monday-Friday, 8am-5pm Closed Saturday and Sunday Full service laboratory on site. Hours are Monday–Friday, 8am–5pm.