Karen Barnhart, APRN-CNP

Nurse Practitioner

Internal Medicine

Make an appointment

614-685-3333
Accepting new patients

Conditions and expertise

  • Osteoporosis
  • Endocrinology
  • Thyroid Diseases
  • Diabetes Mellitus

Locations

  • Primary Care – General Internal Medicine in Outpatient Care Dublin
  • Endocrinology in Outpatient Care East

View all locations

Academic information

Department: Internal Medicine

About

Gender
Female

Biography

I am a board-certified nurse practitioner specializing in endocrinology at The Ohio State University Wexner Medical Center. I provide care for patients with diabetes, thyroid disorders and osteoporosis. 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.

Conditions and expertise

  • Diabetes Mellitus
  • Endocrinology
  • Osteoporosis
  • Thyroid Diseases

Locations

Primary Care – General Internal Medicine

6700 University Boulevard
4th Floor, Suite 4C
Dublin, OH 43016
614-293-0080

Endocrinology

543 Taylor Ave.
Suite 2026
Columbus, OH 43203
614-685-3333

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

Credentials

Education

Master of Science (MS)
Ohio State University College Of Nursing, Columbus, OH, USA
8/1/2013 - 6/30/2015
Master of Science in Nursing (MSN)
Wright State University, Dayton, OH
8/1/2009 - 12/15/2012

Certification

  • American Academy of Nurse Practitioners-Adult Nurse Practitioner
    7/15/2015

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.

93 Patient Satisfaction Reviews

4.9 out of 5 stars overall
  • Listens carefully
    5.0 stars out of 5
  • Explains thing carefully
    4.9 stars out of 5
  • Talks about my concerns
    4.7 stars out of 5
  • Knows my medical history
    4.8 stars out of 5
  • Gives understandable instructions
    4.9 stars out of 5
  • Time spent together
    5.0 stars out of 5
  • Shows respect
    5.0 stars out of 5

Patient Comments

  • 5.0 stars out of 5 Reviewed on Jun 24, 2026

    This was my first appointment with NP Karen Barnhart (although I've been seeing Dr O'Donnell for 10 years now). This was a follow-up appt for amiodarone induced hyperthyroidism (amiodarone due to AFib). Dr O'Donnell has treated me for this in the past (due to other heart arrhythmias), and this time put me on methimazole. TSH levels have now come back into the normal range.NP Karen Barnhart and I discussed hyperthyroidism, thyroiditis, methimazole and associated side effects. She was very patient with my numerous questions and, as is also the case with Dr O'Donnell appts, I learned a lot. Also during the time leading up to this appointment, I had several OSU MyChart messages with Dr O'Donnell about continuing / discontinuing amiodarone (which my electrophysiologist at Christ Hosp wanted to use for AFib). Dr O'Donnell has always been really great at answering my questions and addressing my concerns using MyChart. Both Dr O'Donnell and NP Barnhart are TOPS !

  • 5.0 stars out of 5 Reviewed on Jun 22, 2026

    She was great very detailed

  • 5.0 stars out of 5 Reviewed on May 21, 2026

    Good explanation of how to get glucose doen

  • 5.0 stars out of 5 Reviewed on May 13, 2026

    She was very knowledgeable and kind.

  • 5.0 stars out of 5 Reviewed on May 08, 2026

    Very good

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