| Business | Phone |
| Doctors' Financial Management 630 S Glassell St # 100, Orange 92866 | (714) 771-1060 |
| Advanced Medical Billing Svc 1549 N Fern St, Orange 92867 | (714) 633-8785 |
| Billing Savi 770 W Town And Country Rd, Orange 92868 | (714) 648-0977 |
| Orange Hills Billing Svc 1242 E Walnut Ave, Orange 92867 | (714) 744-6108 |