Contact Us Pay Your Bill Patient Portal FIND A DOCTOR FIND A SERVICE OR SPECIALITY PATIENTS & VISITORS HOME MCRHC FIND A PHYSICIAN OR PRACTITIONER OUR PROVIDERS FIND A PHYSICIAN OR PRACTITIONER Our Providers Visiting Specialists OUR PROVIDERS FAMILY PHYSICIAN OF THE YEAR RECIPIENT BY THE IOWA ACADEMY OF FAMILY PHYSICIANS (IAFP) 1994 MEMBER: AMERICAN ACADEMY OF FAMILY PHYSICIANS, THE IOWA MEDICAL SOCIETY AND THE AMERICAN MEDICAL ASSOCIATION Dr. Ross graduated from the University of Iowa in 1981 and completed his residency at Broadlawns, Des Moines, Iowa in 1984. Dr. Ross and his wife, Glenda, have four children -Ben, Beth, Rebecca and Kaleb. Dr. Ross' hobbies include family activities and running. Dr. Ross is also a member of Sacred Heart Catholic Church and the Mitchell County Board of Health. Dr. Ross' special interest is in Geriatric Medicine. Dr. Ross was the Family Physician of the Year in 1994. Board Certified Fellow: American Academy of Family Physicians Member: American Academy of Family Physicians, Iowa Osteopathic Medical Association Dr. Nasstrom graduated from Concordia College in Moorhead, MN, and then completed his medical school at Des Moines University in Des Moines, IA. He then completed his residency at Broadlawns, also in Des Moines. Dr. Nasstrom is board certified in Family Medicine. Board Certified Dr. Hargens is a graduate of Iowa State University and holds a medical degree from the University of Iowa. He completed his residency at Mercy Medical Center - North Iowa. Dr. Hargens is board certified in Family Medicine and provides a full scope of family practice health care in the Osage Clinic. Megan Peterson, D.O. Dr. Peterson holds a medical degree from Des Moines University. She completed her residency at Lutheran Hospital in Des Moines, specializing in Family Medicine with a concentration in women's health. Orginally from Osage, Iowa, she see patients of all ages. Board Certified Dr. Branstetter is a graduate of the University of Health Sciences College of Osteopathic Medicine in Kansas City, MO. He completed his residency in general surgery at UPMC-Horizon Hospital in Farrell, PA. Dr. Branstetter has more than 20 years of experience as a general surgeon, performing a variety of procedures from colonoscopies to hysterectomies and carpal tunnel to hernia repair. Member: American Nurse Practitioners Association Advanced Registered Nurse Practitioner, Colleen Byrnes, joined the Mitchell County Regional Health Center provider team in December of 2012. Byrnes is an Osage native, a graduate of the University of Iowa and Winona State University. Prior to joining MCRHC, she was employed by Mayo Health Systems in Austin, MN. Byrnes provides emergency room coverage in addition to her family medical practice at the MCRHC Osage Clinic. Coral Gerdts, DPM Dr. Coral Gerdts, a Mitchell County native and podiatrist at Mitchell County Regional Health Center, has expanded her practice to both Riceville and St. Ansgar. Gerdts is a 1998 graduate of podiatric medicine from the University of Osteopathic Medicine and Health Sciences in De Moines, Iowa. She has been providing podiatry care in Mitchell County since 2010 as a private practice within the MCRHC Specialty Clinic. As of June 2016, Gerdts transitioned from her private practice, joining the MCRHC provider team. Member: National Board of Certification and Recertification for Nurse Anesthetists Tony obtained an Associate of Science in Nursing degree in 1993, followed by a Bachelor of Science in Nursing and Master of Nurse Anesthesia in 2000, both from the Mayo School of Health-Related Sciences. In 2010, Tony received a Doctor of Nurse Anesthesia Practice from Virginia Commonwealth University. Throughout his career, Tony has held a variety of healthcare roles; paramedic, staff registered nurse, teaching and his current role at MCRHC, Certified Registered Nurse Anesthetist. Member: American Association of Nurse Practitioners Julie Potter, an Advanced Registered Nurse Practitioner, joined the Mitchell County Regional Health Center provider team in April 2014. Julie is an Osage native and graduated of Osage Community High School. She obtained a Bachelors of Nursing degree and Masters of Nursing degree from the University of Iowa. Prior to joining the MCRHC team, she had 14 years of clinical experience in nursing, urgent care, primary care and women's health. Member: American Academy of Ophthalmology, Iowa Optometric Association Dr. Roggensack attended the Illinois College of Optometry, graduating in 1986. He completed his residency at West Side Veterans Hospital in Chicago, IL. Dr. John Ferrell, O.D. Dr. Ferrell has more than 20 years of experience as an optometrist. He attended Wartburg College and completed graduate school at the Illinois College of Optometry. He is from Webster City, Iowa. Marcia Rosendahl obtained a Diploma Registered Nurse from Marshalltown Community School of Nursing, a Bachelor of Science in Nursing from the University of Iowa, holds a Master of Science/Family Nurse Practitioner degree from Winona State University, and a Doctorate of Nursing Practice from the University of Minnesota. While providing care in the MCRHC Emergency Room, Marcia also is employed at Austin Medical Center – Mayo Health System, in Austin, MN. Stephanie Taets, an Advanced Registered Nurse Practitioner, joined the Mitchell County Regional Health Center provider team in January 2016, primarily providing health care at the MCRHC Riceville Clinic. Member: American Academy of Physician Assistants, Iowa Physician Assistant Society Holly Voigt, a Physician Assistant, joined Mitchell County Regional Health Center provider team in the spring of 2013, primarily seeing patients in the MCRHC St. Ansgar Clinic. Voigt received her undergraduate degree in 2004 from Luther College in Decorah, IA and following several years of working in transfusion medicine attended the University of South Dakota, graduating in 2011 as a Physician Assistant. Prior to joining the MCRHC provider team, Voigt provided care in the emergency department at Olmstead Medical Center in Rochester, MN. Voigt provides emergency room coverage in addition to her family medical practice with MCRHC. Callie White, ARNP Advanced Registered Nurse Practitioner, Callie White, joined the Mitchell County Regional Health Center provider team in February of 2019. White is a graduate of Northern Oklahoma College, Chamberlain College of Nursing and Allen College. Prior to joining MCRHC, she was employed by Floyd County Medical Center as an RN. White provides emergency room coverage in addition to her family medical practice at the MCRHC St. Ansgar Clinic. Johanna Smalley, ARNP A graduate of Viterbo University with a master's degree in Nursing, Johanna Smalley received certification from Mayo Clinic School of Health Sciences as a family nurse practitioner. She has nursing experience at Mayo Clinic in Rochester, MN and Mercy Medical Center Des Moines. She is from Osage, Iowa. 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