Mariel McGuiness, MD
Physician, Assistant Professor
Primary Care - Internal Medicine, Pediatrics
Accepting new patients
Conditions and expertise
- Transition to Adult Care
- Autistic Disorder
- Preventive Medicine
- Internal Medicine
- Primary Care
Locations
- Internal Medicine and Pediatrics Hilliard
Academic information
Department: Internal Medicine
About
- Gender
- Female
Biography
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.
Conditions and expertise
- Autistic Disorder
- Internal Medicine
- Preventive Medicine
- Primary Care
- Transition to Adult Care
Locations
Please note: Not all physicians schedule patients at each listed location.
Credentials
Education
- Residency - Internal Medicine/Pediatrics
- Ohio State University Wexner Medical Center, Columbus, OH, United States
7/1/2020 - 6/30/2024 - Doctor of Medicine (MD)
- Ohio State University College of Medicine, Columbus, OH, United States
8/1/2016 - 5/3/2020
Certifications
-
American Board of Pediatrics
10/17/2024 -
American Board of Internal Medicine
8/20/2024
Ratings and 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
Patient Comments
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 11/3/2025, Dr. McGuiness has reported no relationships with companies or entities.
Love our doctor! So knowledgeable and personable. She is truly genuine and a wonderful provider
She's interested in what I had to say, and make recommendations.
Dr. McGuiness was very personalized and empathetic in her care and her recommendations for treatment.
Very easy to talk to and knowledgeable
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.
Everything was good.
Everyone was very professional and nice
Provider was very friendly and attentive to baby's care; offered clear and concise answers to questions; did not rush the appointment
Thorough. Thoughtful. Engaging.
I've been going to doctors that haven't been listening to me for YEARS so it's finally nice to have one that's looking into problems
She was very nice and checked my baby very well
Dr McGuiness was so great and helpful. I've been hesitant to set up care with a new doctor, but in our first appointment she made me feel so comfortable and heard.
Very happy with the care I received
This was my first time with this provider and I had a great experience as she listen and we talked about my ageing issues and concerns.
All good
Everything was amazing.
None. It was all good.
First time meeting, establishing care. Absolutely thought provider was the perfect fit for my care
She was hopeful
She gave me lots of information in a way I could understand and took my problems serious even if they did seem out of norm and gave me good resources to help my concerns.
She is personable, highly motivated to be exceptionally knowledgeable, and thoughtful in her approach to appropriate diagnosis and treatment.
Very good
Dr. McGuiness was delightful and took time to get to know me.
Dr. MccGuiness was very nice, professional and thorough. I would highly recommend her. I would like my wife to see her also!
Good experience as a new patient having issues
She was wonderful very well versed in various treatment plans
Excellent service