| Business | Phone |
| J J & R Med Data Systems Inc 342 Bonnie Cir, Corona 92880 | (951) 737-1359 |
| Bsb Medical Svc Inc 1128 E 6th St, Corona 92879 | (951) 808-9700 |
| Dental Billing Svc 378 Arthur Cir, Corona 92879 | (951) 279-9120 |
| Foothill Billing Solutions Corona 92882 | (951) 898-9070 |
| Medsmart Of So California 1180 Olympic Dr # 108, Corona 92881 | (951) 278-5590 |
| Recombi Inc 321 E 6th St, Corona 92879 | (951) 340-4307 |
| Western Automoated Utilities 3175 Palisades Dr, Corona 92880 | (714) 632-1711 |
| Valley Medical Svc 268 N Lincoln Ave, Corona 92882 | (951) 898-1152 |
| Preferred Billing Svc Po Box 3100, Corona 92878 | (951) 371-6000 |
| Priority One Billing Po Box 78148, Corona 92877 | (951) 245-6137 |