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Physician Directory

Andrea Jeffries, ARNP


Andrea received her Associates degree in nursing from North Iowa Community College in Mason City, IA. She went on to complete her Bachelors of Science in Nursing at Chamberlain College of Nursing in St. Louis, MO and earned her Masters of Science degree in nursing from Maryville University in St. Louis, MO.



Kate Froehner, ARNP


Kate Froehner graduated from Luther College in Decorah, Iowa with her bachelor’s in nursing and went on to receive her master’s degree in family nurse practitioner program at Allen College in Waterloo, Iowa.

Prior to joining the Mason City Clinic Psychiatry department in August of 2016 Kate studied community health abroad and was actively involved in the ACE SAP free clinic in Waterloo.

In her free time Kate enjoys spending time with her family at the lake, reading, cycling and participating in competitive runs.

Lark Trygstad, MA, ARNP-C

GI/Internal Med

Lark Trygstad earned her Bachelor of Science degree in Nursing from the University of Iowa College of Nursing in Iowa City, and her Master of Arts degree in Nursing from the College of St. Catherine in St. Paul, Minnesota.

A staff member of the Mason City Clinic since 2001, Lark is a Geriatric Nurse Practitioner in the Internal Medicine Department and handles Capsule Endoscopy procedures for visualization of the small bowel. She has a tremendous amount of experience in geriatric healthcare and has credentialing by the American Nurses Association as a Gerontological Nurse Practitioner. Lark is a member of the American Society of Geriatrics and Sigma Theta Tau, the International Nursing Honor Society and American Nurses Association.

Taylor Stille, ARNP


Taylor graduated from the University of Iowa with a Bachelor of Arts in Psychology and went on to receive her Bachelor of Science in Nursing from the College of St. Scholastica in Duluth, MN. She obtained her Doctorate in Nursing from the University of Iowa and is currently board-certified and prepared in both Family Practice-General Medicine and Psychiatric Mental Health. She is a member of the NeuroScience Educational Institute.

Taylor joined the Mason City Clinic Psychiatry department in July of 2017.

Outside the office loves spending time were her husband and children, boating in Clear Lake, exercising, and traveling.

Our Mission

Why more patients choose Mason City Clinic for all their specialized health needs

World-class care, close to home. That’s what people want. That’s what Mason City Clinic delivers. Mason City Clinic’s well-educated, highly credentialed and experienced physicians bring the latest technology and leading-edge procedures.

During the past 25 years, we have helped hundreds of thousands of people throughout the North Central Iowa region. Many of our doctors have Iowa and local ties to go with outstanding reputations in their respective fields. Each physician is supported by caring, helpful staff.

Patient Reviews

Our patients say it Best

"No more sour grapes about knee pain for me."

“I injured my knee as a teenager and had surgery. Then, as I got older, the pain returned and began affecting my routine and overall enjoyment of life. My doctor referred me to Darron Jones, MD, an orthopedic surgeon. After a thorough exam, he said...
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Welcome to Mason City Clinic

In The Media

Radio Podcasts

Mason City Clinic Physicians discuss a variety of patient medical and health issues with Timothy Flemming on monthly KGLO 1300 AM Radio Show

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TV Segments

See Mason City Clinic specialist physicians and staff and their patients featured in a variety of health and medical television segments.

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News Articles

Read patient testimonials and other news about how Mason City Clinic is impacting the lives of northern Iowans through specialty medical care.

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Video Gallery

Get to know our MCC physicians and providers up close and personal with these informative videos. Learn more about their areas of specialization and the many benefits they bring to their patients in Mason City and beyond.

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