Patient Portal. Back to For Patients; Patient Portal Home; Apple Health Contact Form; ... Orthopaedic Surgical Associates, PC. 14 Research Place North Chelmsford, MA 01863 (978) 454-0706 (978) 259-4692 ... Lowell, MA 01854 Call: 978 937 6000 TTY: 978 937 6889. Proud Members of..