Allegiance Benefit Plan Management is a Missoula, Montana-based third-party administrator (TPA) of self-funded employee health plans, founded in 1981 as Intermountain Administrators and renamed in 2003. Since 2008 it has been a wholly owned subsidiary of Connecticut General Life Insurance Company, part of The Cigna Group, and it administers benefits, reimbursement accounts, COBRA and care management for about half a million plan members nationwide.