A health insurer is about to celebrate the completion of an office that supports its mail-order prescription drug service.

Humana Inc., Louisville, Ky., will be opening a RightSource Customer Care Call Center Monday in Tempe, Ariz., the company says.

The center, which now employs 370, eventually will employ 450 people, according to Humana.

Humana’s RightSource unit provides prescription drugs for 600,000 members of Humana Medicare and commercial health plans, the company says.

Humana reports that it also is preparing to open a direct marketing service call center in Phoenix.