We Want to Hear From You. Please fill out our Customer Feedback Survey and tell us about your MedStar experience. Worcester, MA 508-799-0004 Leominster, MA 978-466-1444 Fitchburg, MA 978-466-1444 Northampton, MA 413-587-0010 Billing Department MedStar Ambulance, Inc. P.O. Box 986525 … Continue reading Contact