Groton Medical Associates. 100 Boston Road. Groton, MA 01450. Get Directions. 978-448-4300. 978-448-4040. 2. Emerson Practice Associates. 133 Ornac. Concord, MA 01742. Get Directions. ... - Providers who are "accepting new patients" are able to book new patient appointments within 90 days. "Accepting new patients" is subject to change. Please ....