| Business | Phone |
| St Mary Physician Billing 209 W Poplar St, Walla Walla 99362 | (509) 522-5815 |
| Oncology Group Billing Svc 14 E Main St 4, Walla Walla 99362 | (509) 525-2220 |
| Medical Data Svc 2316 Eastgate St # 130, Walla Walla 99362 | (509) 529-2610 |
| Mediserv Inc 1111 S 2nd Ave, Walla Walla 99362 | (509) 525-7400 |