| Business | Phone |
| Mass Billing Inc 987 Main St, Springfield 1103 | (413) 535-2400 |
| Medical Expense Recovery 47 Marquette St, Springfield 1104 | (413) 734-7050 |
| Provost Billing Svc 36 Taber St, Springfield 1118 | (413) 782-2228 |
| Mass Billing Inc 989 Main St, Springfield 1103 | (413) 732-1550 |