Welcome to InterWest Health – a preferred provider organization
(PPO) serving Montana, Idaho, Washington, North Dakota, South Dakota and Wyoming. InterWest is the
largest, most comprehensive preferred provider network available in the
region, consisting of over 15,000 participating providers. Today, over
170,000 enrollees are covered under health benefit plans that utilize
InterWest's PPO network.
2809 Great Northern Loop Suite 300
Missoula, Montana 59808 (406) 542-1912 Toll
Free (877) 542-1912
Serving Montana, Idaho, Washington, North Dakota, South
Dakota and Wyoming