Contact Assistant
Corporate Headquarters
Allegiance Benefit Plan Management, Inc.
Missoula, MT 59801
Toll Free: 800-877-1122
Local: 406-721-2222
Allegiance Benefit Plan Management, Inc.
PO Box 21074
Eagan, MN 55121
Toll-Free: 800-877-1122
Fax: 406-523-3111
Allegiance COBRA Services, Inc.
PO Box 2097
Missoula, MT 59806-2097
Toll-Free: 800-259-2738
Fax: 406-523-3131
Allegiance Advantage Reimbursement Accounts
PO Box 4346
Missoula, MT 59806-4346
Toll-Free: 877-424-3570
Automatic Voice Response System available 24/7
Fax: 877-424-3539
Allegiance Care Management
PO Box 2339
Missoula, MT 59806-2339
Case Management
Toll-Free: 877-792-STAR (7827)
Fax: 406-532-1502
Utilization Management
Toll-Free: 800-342-6510
Inpatient Fax: 406-532-1501
Outpatient Fax: 406-532-3513
Allegiance Holiday Closures
| New Year's Day | Thursday, January 1, 2026 |
| Martin Luther King Jr. Day | Monday, January 19, 2026 |
| Memorial Day | Monday, May 25, 2026 |
| Independence Day | Friday, July 3, 2026 |
| Labor Day | Monday, September 7, 2026 |
| Thanksgiving Day | Thursday, November 26, 2026 |
| Day after Thanksgiving | Friday, November 27, 2026 |
| Christmas Day | Friday, December 25, 2026 |