Valley Medical Greenfield Ma Portal. Health (8 days ago) Valley Medical Greenfield Patient Portal University. Health (3 days ago) Valley Medical Group Primary Care. University Details: GREENFIELD HEALTH CENTER. 329 Conway Street Greenfield, MA 01301 Phone (855) 460-0573 Fax 1-866-644-0871 Office Hours: Monday-Friday, 8am-6pm Saturday Urgent Care, 10am-1pm Full service laboratory on site..