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Physician Directory

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 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.

Mindy Murray, ARNP, PMHNP-BC


Mindy earned her associate degree in Nursing from North Iowa Area Community College. She continued her education at the University of Iowa, where she received her bachelor’s degree in Nursing and went on to complete her Master of Science Degree in Nursing at Allen College. She is certified as a psychiatric-mental health nurse practitioner.

Prior to joining the Mason City Clinic Psychiatry Department, Mindy worked with geriatric and long-term care patients and was an adjunct nursing instructor at NIACC. Her passion is caring for adults and providing education for their loved ones.

In her free time, Mindy enjoys reading, hiking, cheering on her favorite sports teams with her family, golfing with her husband and vacationing in Florida.

Michelle Plunkett, ARNP

Michele received her undergraduate degree from University of Iowa and her master’s in Nursing Sciences from Allen College in Waterloo, Iowa. She is certified by the American Association of Nurse Practitioners and a member of Sigma Theta Tau Honors Nursing Society.

Michele brings over 20 years of registered nurse experience in acute care, intensive care and in the Cardiac Stepdown Unit.

In her free time, she enjoys spending time with her family, traveling and practicing her culinary skills.



Colombia Ptacek, ARNP

Colombia Ptacek earned her Bachelor of Science degree in Nursing and her Master of Arts degree as a family nurse practitioner from Allen College in Waterloo, IA. She is certified by the American Nurses Credentialing Center.

Colombia looks forward to providing care to those who live in the community as well as the surrounding area.

In her free time, Colombia enjoys spending time with family, cooking and going to the theater.

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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