About Me

My focus is on caring for patients with chronic obstructive pulmonary disease (COPD). I also specialize in pulmonary rehabilitation for all patients who suffer from lung disease.

I believe in providing specialized, state-of-the-art and compassionate care to individuals with lung problems. Educating my patients is important to me. I feel very strongly about providing them an opportunity to participate fully in their own care.

Helping individuals make good decisions about their health is fundamental. My goal is to work together to achieve the best quality of life possible for them. Being able to do this makes me passionate about my career.

I love working at Ohio State. As the only academic medical center in central Ohio, we have the opportunity to provide world-class medical care, which includes the latest innovations.

When I'm not working, I like to relax with my family. I also enjoy sports. I'm an Ohio State football fan. As an undergraduate, I was captain of the Brown University tennis team.
  • Rated in the top 10 percent of physicians in the nation for patient satisfaction, 2014, 2015, 2018 and 2019
  • Elected to the Alpha Omega Alpha Medical Honor Society, 1988
  • America's Best Doctors, 2002–present
  • National Institutes of Health (NIH) Study Section “Infections, Reproductive, Asthma and Pulmonary Epidemiology (IRAP),” Member 2009–2013
  • Named to the Castle Connolly list of “Regional Top Doctors,” 2015–2019
  • Best Doctor in America, 2017

Procedures and Conditions I Treat

  • Sleep Disorders
  • Intensive Care
  • Intensive Care Units
  • Pulmonary Medicine
  • Pulmonary Disease, Chronic Obstructive
  • Rehabilitation
  • Pneumonectomy

My Videos

Education and Training

Education History

Medical School

Penn State University, University Park, PA
9/1/1982 - 1/1/1986


Ohio State University Wexner Medical Center, Columbus, OH

1/1/1986 - 1/1/1989


Ohio State University Wexner Medical Center, Columbus, OH

1/1/1989 - 1/1/1992

Board Certifications

American Board of Internal Medicine

American Board of Internal Medicine (Subspecialty: Pulmonary Disease)

American Board of Internal Medicine (Subspecialty: Critical Care Medicine)

Academic Information

My Department

Internal Medicine

My Division

Pulmonary, Allergy, Critical Care and Sleep Medicine


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.

313 Patient Satisfaction Reviews

  • Overall
    4.9 out of 5
  • Explains Things Clearly
    4.9 out of 5
  • Listens Carefully
    4.9 out of 5
  • Gives Understandable Instructions
    4.9 out of 5
  • Knows My Medical History
    4.7 out of 5
  • Shows Respect
    4.9 out of 5
  • Time Spent Together
    4.9 out of 5
  • Reviewed on Jun 05, 2020


  • Reviewed on May 19, 2020

    Dr. Diaz - fantastic! Remember a family member's health problems - approachable.

  • Reviewed on May 08, 2020

    Dr. Diaz is incredible! I can't say enough good things about him.

  • Reviewed on Apr 02, 2020

    I was very pleased with Dr. Diaz. He LISTENED, which was wonderful. We were going to proceed to more testing, but this COVID-19 event resulted in cancellation of my appt. for further tests.

  • Reviewed on Mar 31, 2020

    I would recommend Dr. Diaz to everyone.

  • Reviewed on Mar 17, 2020

    he was very nice and easy to talk with.

  • Reviewed on Mar 04, 2020

    My experiences were all good.

  • Reviewed on Feb 29, 2020

    always listens to your concerns

  • Reviewed on Feb 28, 2020

    I have total confidence in Dr. Diaz. He is the best dr. I have worked with dealing with my lungs.

  • Reviewed on Feb 25, 2020

    Most excellent service.

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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 11/21/2019, Dr. Diaz has reported no relationships with companies or entities.