Photo of Dr. Diana Girnita

Dr. Diana Girnita, MD

Concierge Rheumatology, Irvine, CA

Rheumatologist Oncall

Dr. Diana Girnita is a board-certified rheumatologist who founded Rheumatologist OnCall, a direct-pay medical practice in Irvine, California.

19712 MacArthur Blvd suite 100, Irvine, CA 92612
At a glance
Board certified
Internal Medicine and Rheumatology
Licensed in
CA
Telehealth
Offers virtual visits

Facts on this page last checked September 2026. How we check doctors

About Dr. Girnita

Dr. Diana Girnita is board certified in internal medicine and rheumatology and holds the FACR designation. She earned her medical degree and PhD, both summa cum laude, in Romania. She completed an internal medicine residency at Christ Hospital and a rheumatology fellowship at the University of Cincinnati Medical Center/College of Medicine. Her NIH-funded research at Harvard and the University of Pittsburgh produced 17 peer-reviewed publications in transplant immunology.

In early 2020, she founded Rheumatologist OnCall, a direct-pay medical practice that offers in-person and telehealth visits across an 8-state service area. She was named a Top Doctor in Cincinnati for four consecutive years. She has a YouTube channel with roughly 250,000 subscribers.

There are no gatekeepers, medical assistants, or insurance companies standing between us.
Dr. Diana Girnita

Membership and fees

Fees are not published. Ask the practice.

Education and credentials

Education
Completed Stanford University's Nutrition Science program
Education
Studied mindfulness/meditation with Jon Kabat-Zinn, PhD, founder of the Center for Mindfulness in Medicine, and completed a Mindfulness course from the University of Massachusetts
Education
Medical degree and PhD, both Summa Cum Laude, in Romania, graduating, University of Craiova Faculty of Medicine, 2001
Education
Holds a PhD in immunology and transplant immunology
Residency
Internal medicine, Christ Hospital in Cincinnati, Ohio, from 2011 to 2014
Fellowship
Rheumatology, University of Cincinnati Medical Center/College of Medicine from 2014 to 2016
Fellowship
Conducted NIH-funded postdoctoral research in transplant immunology at Harvard University and the University of Pittsburgh's Thomas Starzl Transplantation Institute, producing 17 peer-reviewed publications in transplant immunology
Board certified
Both Internal Medicine and Rheumatology, American Board of Internal Medicine
License
California A167653 Verify with the Medical Board of California
NPI
1922378116

Hospital and practice affiliations

Volunteer assistant professorUniversity of Cincinnati Medical Center

Location

19712 MacArthur Blvd suite 100, Irvine, CA 92612
Rheumatologist Oncall practice page
Directions

Recognition and research

Awards

Was named a 'Top Doctor' in Cincinnati/Ohio by Cincy Magazine for multiple consecutive years (cited as four consecutive years, and elsewhere as 2017-2020).

Publications

Wrote an article for Medscape in which she says she first used the term 'direct specialty care' in print.
Co-authored the peer-reviewed case report 'Sjogren's Syndrome Presenting with Solely Cutaneous Features' (Centala, Park, Girnita), published in Diagnostics, July 2021.
Co-authored 'When Chest Pain Reveals More: A Case of Hydrochlorothiazide-Induced Systemic Lupus Erythematosus' (Sosenko, Pasula, Brahmamdam, Girnita), The American Journal of Case Reports, 2019.
Co-authored 'When Should a Patient with Statin-Induced Myopathy Be Re-challenged? A Case of Necrotizing Autoimmune Myopathy' (Obreja, Sequeira, Girnita), Case Reports in Rheumatology, 2018.

Teaching and research roles

Volunteer assistant professor
University of Cincinnati Medical Center, continuing to be involved in research and teaching
Founded Rheumatologist OnCall, a direct-pay telemedicine rheumatology practice, in early 2020; the practice describes itself as the first direct-pay telemedicine company in rheumatology in the United States.

Media and books

Has been profiled by The New York Times (2023 magazine feature, 'The Moral Crisis of America's Doctors').
Hosts a YouTube channel providing arthritis and autoimmune-disease education, reported at roughly 35 million views and 250,000 subscribers.
Authored the book 'Thriving with Rheumatoid Arthritis: Your Science-Backed Guide to Conquering RA.'
Authored 'The Complete Gout Management and Nutrition Guide: Empowering Strategies for Better Health.'
Authored the 'Rheumatoid Arthritis Journal: Pain Assessment Diary to Track Mood, Pain, Symptoms, Exercise, Sleep and Much More.'

Patient reviews

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Questions patients ask

Is Dr. Girnita board certified?

Yes. Dr. Girnita is board certified in both Internal Medicine and Rheumatology.

Where did Dr. Girnita train?

Dr. Girnita earned her medical degree and PhD, both Summa Cum Laude, in Romania, graduating from the University of Craiova Faculty of Medicine in 2001. Dr. Girnita completed an internal medicine residency at Christ Hospital in Cincinnati, Ohio, from 2011 to 2014.

Where is Dr. Girnita's office?

Dr. Girnita sees patients at Rheumatologist Oncall, 19712 MacArthur Blvd suite 100, Irvine, CA 92612.

Does Dr. Girnita offer telehealth?

Yes. Dr. Girnita offers telehealth (virtual) visits.

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