| Business | Phone |
| A & B Billing Svc Po Box 9000, Carlsbad 92018 | (858) 759-8381 |
| B Ruiz Billing Svc 3474 Paseo Ancho, Carlsbad 92009 | (760) 753-3247 |
| California Standards Property Carlsbad 92008 | (760) 476-0510 |
| Electronic Billing Solutions 2796 Loker Ave W # 110, Carlsbad 92008 | (760) 931-8905 |
| Electronic Billing Solutions 785 Grand Ave, Carlsbad 92008 | (760) 730-8905 |