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Horizon Health White River

About Us

Mellette County Community Health Center joined Horizon Heatlh Care in 2002 and is dedicated to keeping communities well through affordable, high-quality health care. The name changed to Horizon Health White River when Horizon Health Care became Horizon Health in 2024.

Our Providers

Teresa Marts, MD

  • Family Medicine

Michelle Udelhoven, PA-C

  • Family Medicine


309 East 4th Street
PO Box 281
White River,

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Mon: 8:00 am-1:00 pm| 2:00-5:00 pm
Tues: 8:00 am-1:00 pm | 2:00-5:00 pm
Wed: 8:00 am-12:00 pm| 1:00-5:00 pm
Thurs: 8:00 am-1:00 pm | 2:00-5:00 pm
Fri: 8:00 am-12:00 pm | 1:00-5:00 pm

After Hours:

Connect with a provider after-hours by calling your local Horizon clinic. Calls received after-hours will be handled by an on-call provider, who will guide the caller to the appropriate level of care.

  • If you are deaf, hard-of-hearing or speech disabled, simply dial 711 to be connected for support.
  • For a mental health/psychiatric crisis, please call 811.
  • For emergencies or if you have a serious life-threatening illness, condition, or injury that needs immediate assistance, please call 911.
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