The Great Falls Clinic is excited to announce our new Meditech Expanse Patient Portal. Our Meditech Expanse patient portal is now available with the features you are already accustomed to, including the following: ... Great Falls, MT 59405 406-454-2171 1-800-421-1649. MAILING ADDRESS.Doctors / Providers‧My Clinic Care Patient Portal‧Great Falls Clinic‧Contact Us‧Locations‧Medical Records.