Avera Medical Group Sibley

Family Medicine, Osteopathic Manipulative Therapy · 4 Providers

Average Rating of all Office Providers

Office Providers

Dr. Gregory Kosters, DO

Dr. Gregory Kosters, DO

Osteopathic Manipulative Therapy

Tasha Mosier, ARNP

Tasha Mosier, ARNP

Nursing (Nurse Practitioner)

Dr. Mary Rosman, DO

Dr. Mary Rosman, DO

Geriatric Medicine


Office Provider Reviews


based on the average of 12 provider reviews for Avera Medical Group Sibley

Review of Dr. Kosters


Complete disappointment. This doctors bed side manor is well below expectations of a real doctor. His diagnosis of my fathers stroke was not a stroke but a reaction to pain medication. A misdiagnosis such as this can cause someone to lose their life. He needs to have his medical license revoked. Do not by any means use this self called doctor for anything.
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Learn About Avera Medical Group Sibley

23 Procedures

  • Abscess Or Cyst Drainage Or Aspiration
  • Abscess Or Fluid Incision And Drainage
  • Anemia And Iron Deficiency Screening
  • Arterial Blood Gas Test (Abg)
  • Cholesterol Screening
  • Diabetes Screening
  • Electrocardiogram (Ekg)
  • Fecal Occult Blood Test For Colorectal Cancer
  • Hepatitis Screening
  • Liver Function Test
  • Osteoporosis Screening
  • Pregnancy Test
  • Prostate Cancer Screening
  • Pulmonary Function Test
  • Rapid Flu Test
  • Rh Incompatibility Screening
  • Sexually Transmitted Infections Screening
  • Smoking Cessation Counseling
  • Syphilis Screening
  • Thyroid Screening
  • Trichomoniasis Screening
  • Vaginosis Screening
  • Wellness Examination


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Avera Medical Group Sibley accepts 9 insurance carriers

  • Aetna
  • Altius Health Plans
  • Blue Cross Blue Shield
  • Cigna
  • First Health (Coventry Health Care)
  • HAP Insurance
  • Humana
  • MultiPlan
  • Wellmark Blue Cross and Blue Shield
*Please verify this information when scheduling an appointment.