| Business | Phone |
| Amt Billing 595 E Colorado Blvd, Pasadena 91101 | (626) 583-4922 |
| Catholic Healthcare West 251 S Lake Ave # 700, Pasadena 91101 | (626) 744-2300 |
| Medical Business Concepts 540 S Marengo Ave, Pasadena 91101 | (626) 397-4910 |
| Pasadena Billing Assoc 225 S Lake Ave # 535, Pasadena 91101 | (626) 795-6596 |
| West Coast Physician Svc 1250 E Walnut St # 260, Pasadena 91106 | (626) 793-1148 |
| Fat Cat Data Technology 790 E Colorado Blvd, Pasadena 91101 | (626) 296-6217 |
| Pasadena Professional Billing 301 E Colorado Blvd, Pasadena 91101 | (626) 683-9509 |
| Promed Billing Pasadena 91105 | (626) 441-7306 |
| Accurate Health Alliance Inc 1575 N Lake Ave # 206, Pasadena 91104 | (626) 398-1364 |
| Medical Billing 1748 Oakwood St, Pasadena 91104 | (626) 798-4302 |