Patient portal login Locations: Click on a location for contact information: Longmeadow. South Hadley. Springfield. Billing and Administrative Office. Main Office . 3455 Main Street, Suite C Springfield, MA 01107 Phone (413) 794-8484 Fax (413) 794-8477. Longmeadow - Located in the Baystate Health & Wellness Building . 21 Dwight Road, Suite 201.