Umpqua Health is the parent company of Umpqua Health Alliance, one of 16 Oregon coordinated care organizations serving the Or ... egon Health Plan. The Roseburg-based company and its subsidiaries are focused on expanding access, improving care, and reducing unnecessary costs across the clinical space for more than 26,000 Douglas County residents on the Oregon Health Plan and close to 10,000 more individuals with Medicare, private insurance or Exchange coverage. read more