Courtney A. O'Brien, DO
Accepting new patients

Courtney A. O'Brien, DO

  • Rheumatology
5.0
247 ratings
183 reviews
Star ratings are displayed only for those physicians who participate in UCLA Health’s patient experience survey program and have received a minimum of 30 survey responses.
Simi Valley Primary & Specialty Care |
2655 1st Street, Suite 380 Simi Valley, CA 93065
805-583-7640
+1 more location
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About

Dr. Courtney O’Brien is a board certified rheumatologist who practices in Simi Valley and Porter Ranch. She provides comprehensive care in general rheumatology with particular clinical interests in musculoskeletal ultrasound, osteoporosis, lupus, vasculitis, and inflammatory arthritis.

Dr. O’Brien earned her medical degree from Nova Southeastern University College of Osteopathic Medicine, where she received additional training in osteopathic manipulative medicine, emphasizing a holistic approach to patient care. Her passion for rheumatology was sparked early in her medical education through volunteer work with children affected by juvenile arthritis. She went on to complete her internal medicine residency at Rush University Medical Center in Chicago and her rheumatology fellowship at UCLA. She is certified in musculoskeletal ultrasound through the USSONAR program and integrates this advanced imaging technique into her clinical evaluations to ensure accurate and thorough diagnostic assessments.

Dr. O’Brien is also dedicated to global health and has participated in numerous medical outreach initiatives throughout Latin America and the Caribbean, delivering care to underserved populations. 

In her leisure time, Dr. O’Brien enjoys a variety of outdoor activities, including hiking, paddle boarding, skiing, roller skating, camping, and beach volleyball.

Languages

English

Education

Medical Board Certifications

Rheumatology, American Board of Internal Medicine, 2022
Internal Medicine, American Board of Internal Medicine, 2020

Fellowship

Rheumatology, University of California, Los Angeles, 2022

Residency

Internal Medicine, Rush University, 2020

Degree

DO, Nova Southeastern University College Of Osteopathic Medicine, 2017

Recognitions

  • Super Doctors® Southern California Rising Stars 2025

Locations

Hospital Affiliations

Ronald Reagan UCLA Medical Center

Medical Services

Rheumatology

Insurance

  • Aetna
  • Anthem Blue Cross
  • Blue Shield of California
  • Centivo
  • Cigna
  • First Health
  • Health Net of California
  • Interplan (part of HealthSmart)
  • Medicare Advantage
  • MultiPlan
  • UFCM Health System
  • Prime Health Services
  • Private Healthcare Systems (PHCS)
  • TRICARE
  • UnitedHealthcare

The list of health care plans above may not be comprehensive and could change. 
Please contact your benefits coordinator or health insurance company directly to verify coverage.

Visit our health insurance information page for more details.

Recognitions

  • Super Doctors® Southern California Rising Stars 2025

Reviews

Overall rating: 5.0
Star ratings are displayed only for those physicians who participate in UCLA Health’s patient experience survey program and have received a minimum of 30 survey responses.
247 total ratings | 183 reviews
5.0
I had a great visit with doctor. She is very thorough and informative . She listens and explains things and treats you with respect. All my questions were answered. I especially appreciated her willingness to listen to me
5.0
Doctor OBrien is amazing. She explains everything in detail and spends real time with me. Im really happy to be her patient and glad that ucla hires great professionals.
5.0
She was excellent, caring and knowledgeable
5.0
Dr OBirienne is a very good Dr. she listened attentively made recommendations ordered lab a referral to Accupuncturist as well as a hand orthopedic Dr. I have great respect for her. She?s empathetic and took time to hear me out. So happy she?s my doctor. I?d recommend her to all my friends. If they need a specialist. Thank you Dr. O?Brianne.
5.0
Very thorough Detail oriented examination I'm confident based on her comments and tests taken during the exam
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