ADOP-153001 Serving His Hometown of Mitchell Dr. Nathan Timmer feels blessed to care for the health needs in his hometown. He thanks his family, staff and community for their steadfast support as he continues his family medicine practice. Schedule an appointment by calling 605-995-7000. Access Avera HEALTH Medical Group 1900 Grassland Drive | Mitchell, SD 57301 ADOP - 153001 Serving His Hometown of Mitchell Dr. Nathan Timmer feels blessed to care for the health needs in his hometown . He thanks his family , staff and community for their steadfast support as he continues his family medicine practice . Schedule an appointment by calling 605-995-7000 . Access Avera HEALTH Medical Group 1900 Grassland Drive | Mitchell , SD 57301