| Business | Phone |
| Billing Solutions Inc 1730 W Cameron Ave # 205, West Covina 91790 | (626) 960-3957 |
| Moreno's Professional Svc 2694 E Garvey Ave S # 119, West Covina 91791 | (626) 480-8384 |
| Advanced Medical Billing 266 S Glendora Ave, West Covina 91790 | (626) 918-7787 |
| Biotech Medical Diagnostics 1323 W Garvey Ave N, West Covina 91790 | (626) 960-8095 |
| Promedata Medical Billing 1619 W Garvey Ave N, West Covina 91790 | (626) 337-1154 |
| Medasys 3168 E Garvey Ave S, West Covina 91791 | (626) 339-7958 |