Mariel McGuiness

Mariel McGuiness, MD

  • Internal Medicine
  • Pediatrics
  • Physician
Accepting new patients

Insurances We Accept

About Me

I am a board-certified internal medicine and pediatrics physician at The Ohio State University Wexner Medical Center. I specialize in primary care for patients across the lifespan, including transition care for adolescents and young adults.

My patients can rely on me for high quality, compassionate care and honest communication in every encounter. I collaborate with a multidisciplinary team of skilled experts to ensure each patient receives personalized care tailored to their unique needs and values.

In addition to my clinical responsibilities, I am passionate about educating and mentoring the next generation of providers. I am an assistant clinical professor of Internal Medicine at The Ohio State University College of Medicine.

Procedures and Conditions I Treat

  • Autistic Disorder
  • Transition to Adult Care
  • Primary Care
  • Internal Medicine
  • Preventive Medicine

Locations Where I Practice

Please note: Not all physicians schedule patients at each listed location.

Education and Training

Education History

Medical School

Ohio State University College of Medicine, Columbus, OH
8/1/2016 - 5/3/2020

Residency

Ohio State University Wexner Medical Center, Columbus, OH
7/1/2020 - 6/30/2024

Board Certifications

American Board of Internal Medicine
8/20/2024

American Board of Pediatrics
10/17/2024

Academic Information

My Department

Internal Medicine

My Division

General Internal Medicine and Geriatrics

Reviews

The overall patient satisfaction rating is an average of all patient responses to the six doctor communication related questions shown below from the Clinician and Group Consumer Assessment of Healthcare Providers and Systems survey. For additional information about the patient satisfaction survey, please visit our Patient Satisfaction Survey page.

The comments are submitted by patients and reflect their view and opinions. The comments are not endorsed by and do not necessarily reflect the views of Ohio State Wexner Medical Center.

86 Patient Satisfaction Reviews

  • Overall
    4.9 out of 5
  • Reviewed on Sep 02, 2025

    Love our doctor! So knowledgeable and personable. She is truly genuine and a wonderful provider

  • Reviewed on Aug 24, 2025

    She's interested in what I had to say, and make recommendations.

  • Reviewed on Aug 03, 2025

    Dr. McGuiness was very personalized and empathetic in her care and her recommendations for treatment.

  • Reviewed on Jul 28, 2025

    Very easy to talk to and knowledgeable

  • Reviewed on Jul 19, 2025

    This was our first appointment with Dr. McGuiness and it was for newborn weight check/ new patient establishment. She instantly realized that we'd also scheduled a new patient visit with our older daughter for the following week, and she seemed genuinely happy to get to treat both kids. She even asked the nurses to schedule the two of them together. In terms of medical knowledge she was open, kind, and smart. Great experience all around.

  • Reviewed on Jun 18, 2025

    Everything was good.

  • Reviewed on May 11, 2025

    Everyone was very professional and nice

  • Reviewed on May 06, 2025

    Provider was very friendly and attentive to baby's care; offered clear and concise answers to questions; did not rush the appointment

Consulting and Related Relationships

At The Ohio State University Wexner Medical Center, we support a faculty member’s research and consulting in collaboration with medical device, research and/or drug companies because a faculty member’s expertise can guide important advancements in the practice of medicine and improve patient care. In order to provide effective management of these relationships, the University requires annual disclosures from all faculty members with external interests related to their University responsibilities.

As of 09/30/2024, Dr. McGuiness has reported no relationships with companies or entities.

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