| Business | Phone |
| Cmcs Inc 1041 S Placentia Ave, Fullerton 92831 | (714) 738-7400 |
| Doctors Billing Co Po Box 5448, Fullerton 92838 | (714) 692-6699 |
| Accurate Medical Billing 700 W Rosslynn Ave, Fullerton 92832 | (909) 484-6043 |
| Financial Debt Recovery 285 Imperial Hwy # 101, Fullerton 92835 | (714) 871-3488 |
| Nch Management Systems Inc 1440 N Harbor Blvd, Fullerton 92835 | (714) 871-7520 |