We are currently experiencing intermittent phone line interruptions at St. Anthony Clinic and Iowa Heart Center in Carroll.
Until further notice, please utilize these phone line numbers:
St. Anthony Clinic: 712-794-5250
Iowa Heart Center: 712-794-5002

Internal Medicine

Browse Services

Explore Other Services

Comprehensive Care for Adult Patients

Internists provide personal, patient-centered care that is accessible, coordinated and comprehensive. Our care team specializes in the care of adults, focusing on the prevention and treatment of adult diseases—from routine care of common illnesses and injuries to specialized care for rare or complex diseases and conditions.

Your internist / adult medicine physician will work closely with surgeons and other medical specialists to ensure that your care is coordinated and comprehensive.

Why Choose an Adult Internal Medicine Specialist?

Your internist specializing in adult medicine will act as your primary care physician, providing your annual physicals, as well as the treatment for common colds and flu, and more complex diseases such as diabetes, cancer and heart disease. Your internist will also arrange referral for specialty or surgical care and will provide preoperative evaluation and primary hospital care if needed.
  • Adults
    Internists are trained to care specifically for adults, from young adults to the elderly, which differs from pediatrics (children) and obstetrics/gynecology (women's reproductive health).
  • Internal Organs
    The specialty addresses diseases of the heart, blood, kidneys, lungs, digestive system, and other internal organs.
  • Broad Scope
    Internists manage a wide range of conditions, from acute issues like colds to chronic diseases such as diabetes, cardiovascular disease, and asthma.
  • Complexity
    They are experts in managing complex medical problems, particularly chronic conditions, where multiple organ systems may be involved.

The Role of an Internist

  • Primary Care Provider
    Internists often serve as a patient's main healthcare provider, offering general medical care and wellness visits.
  • Disease Prevention
    They focus on preventive healthcare, including vaccinations and screenings to prevent diseases like heart disease and certain cancers.
  • Care Coordination
    Internists coordinate with specialists (such as cardiologists or oncologists) to ensure comprehensive care for complex cases.
  • Diagnostic Expertise
    Their training provides them with specialized knowledge to solve complex diagnostic problems.

Medical Staff in Internal Medicine

Gregory Sibenaller, DO

Internal Medicine

READ BIO

Latest News

Read More News
  • March 12, 2026
  • Medical Care, Team Highlights

St. Anthony Welcomes Two New Providers to Carroll Clinic

St. Anthony Regional Hospital is pleased to welcome two new providers to the St. Anthony Clinic in Carroll: Greg Sibenaller,…

Read More
  • August 20, 2026
  • The Birth Place

Celebrating Breastfeeding Awareness Month: Lactation Support Beyond Delivery

August marks Breastfeeding Awareness Month, and St. Anthony Regional Hospital wants to remind expectant mothers and families that The Birth…

Read More
  • August 05, 2026
  • Recognition and Awards

St. Anthony Regional Hospital Earns Five-Star Rating for Nurse and Physician Communication

St. Anthony Regional Hospital is one of only 183 hospitals nationwide – and one of eight in Iowa – to…

Read More
  • July 29, 2026
  • Medical Care, Recognition and Awards

A St. Anthony Milestone: Celebrating 1,000-Plus Joint Replacements with the Mako Surgical Robot

St. Anthony Regional Hospital has 1,000 more reasons to celebrate! Michael Dirkx, D.O., and Richard Goding, M.D., have each reached…

Read More
  • July 23, 2026
  • Medical Care, Recognition and Awards

Helmsley Charitable Trust Awards $2 Million to Support PET/CT Scanner Project at St. Anthony

St. Anthony Regional Hospital has received a $2 million grant from The Leona M. and Harry B. Helmsley Charitable Trust…

Read More
  • July 21, 2026
  • Recognition and Awards

St. Anthony Nationally Recognized for Cardiovascular Care and Cardiac Arrest Survival

The American Heart Association presents the Get With The Guidelines® awards for proven dedication to best practices, life-saving care. St….

Read More
Read More News

Search St. Anthony Regional Hospital

St. Anthony News

St. Anthony sends out a quarterly newsletter with current health messages, services, and other educational material. If you would like to be included, fill out form below!