Family Practice

Dr. Preston Sereg, Family Medicine Physician serves the Mahaska Health community as a Family Medicine Physician. Dr. Sereg was born and raised in Oskaloosa and has worked in healthcare for the past 9 years. Dr. Sereg chose to practice at Mahaska Health because he wanted to take part in and give back to the community…

Family Medicine & Weight Loss Specialist

  Dr. Trish Millner – Family Medicine & Weight Loss Specialist, joins the Mahaska Health Community after 9 years of training, teaching and working in healthcare. Dr. Millner is fellowship trained in high-risk Obstetrics and provides a range of family practice and women’s health services for patients. Dr. Millner chose to become a physician at…

Mark Zacharjasz, MD

Hospice Medical Director, Family Medicine, Hospice Care

Dr. Mark Zacharjasz serves as Mahaska Health Hospice Medical Director and believes in offering his patients the best possible treatments and advice while upholding their values and autonomy. He accomplishes this by understanding each patient as a whole through the context of their life. Dr. Zacharjasz is passionate about helping patients and their families through…

Alyssa Zacharjasz, DPM

Alyssa Zacharjasz, DPM, AACFAS, FACFAOM, has been serving with Mahaska Health since 2018. She is a small town Iowa native and has always wanted to practice medicine in a rural setting. Alyssa attended the University of Iowa as well as Des Moines University before completing a rigorous surgical residency program at St. Mary’s Medical Center…

Ophthalmology

Dr. Ryan Vincent and Dr. Reid Turner are at Mahaska Health every 3rd Thursday. To schedule an appointment, call Wolfe Eye Clinic at 515.232.2450. Specialty Ophthalmology Board Status American Board of Ophthalmology Professional Associations American Academy of Ophthalmology American Glaucoma Society Association for Research in Vision and Ophthalmology Education University of Colorado, Denver School of…