Fall River, MA 02721 (508) 676-3292 Prima CARE Billing P.O. Box 1029 Fall River, MA 02722 (508) 675-7819 Prima CARE is by your side Offices in: Fall River, Dartmouth, Somerset, Swansea, Westport, Tiverton, RI. Web Address www.prima-care.com To access your account from the address above, click the Patient Portal link and.