| Business | Phone |
| Billing Masters 23361 El Toro Rd # 205, Lake Forest 92630 | (949) 859-5928 |
| Cpc Unlimited 23591 El Toro Rd # 190, Lake Forest 92630 | (949) 716-2450 |
| Creative Billing Svc 23720 El Toro Rd, Lake Forest 92630 | (949) 215-5008 |
| Monox Billing Svc 26816 Vista Ter, Lake Forest 92630 | (949) 588-2190 |
| Physicians Prefered Bill Svc 21602 Vintage Way, Lake Forest 92630 | (949) 454-9909 |