Dr. Courtney Ann O'brien
DO | Rheumatologist | 8+ years Exp
Medicare Enrolled
2655 1st St Ste 380, Simi Valley
California, 93065-1551
805-583-7640 805-583-7641
Maps & DirectionsDr. Courtney Ann O'brien is a Simi Valley, California based rheumatologist with 8 years of experience in Rheumatology. She completed her graduation from Nova Southeastern College Of Osteo Medicine in 2017. She is also affiliated with hospitals like Ronald Reagan Ucla Medical Center and Lac/harbor-ucla Med Center. She accepts the Medicare-approved amount. Patients will not be billed for any more than the Medicare deductible and coinsurance. Active license number of Dr. Courtney Ann O'brien for Rheumatology is 20A18469 in California.
Dr. Courtney Ann O'brien treat joint disease similar to orthopedists but do not perform surgeries. She diagnose and treat diseases of joints, muscle, bones and tendons which includes arthritis, back pain, muscle strains, common athletic injuries and 'collagen' diseases.
Complete Profile:
Dr. Courtney Ann O'brien speciality, credentials, practice address, contact phone number and fax are as below.
Patients can directly walk in or can call on the below given phone number for appointment.
| Specialization: | Rheumatology |
| Credentials: | DO |
| Experience: | 8+ years |
| Medical School Attended: | Nova Southeastern College Of Osteo Medicine |
| Graduation Year: | 2017 |
| Gender: | Female |
| Accepts Medicare Assignment: | Yes |
| Practice Address: | 2655 1st St Ste 380, Simi Valley,
California, 93065-1551 |
| Phone: | 805-583-7640 |
| Fax: | 805-583-7641 |
Professional Identification Codes:
NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS).
NPI details are as mentioned below.
| PAC ID: | 9537430020 |
| Enrollment ID: | I20220616001464 |
| NPI Number: | 1609396514 |
| NPI Enumeration Date: | 21 Jun, 2017 |
| NPI Last Update On: | 29 Jul, 2022 |
Medical Licenses:
Doctors can have one or more medical licenses for different specialities in the same state or different states. Related medical licenses for Dr. Courtney Ann O'brien are as mentioned below.
| License Number | Specialization | State | Status | |
| 20A18469 | Rheumatologist | California | Primary | |
Hospital Affiliation:
Surgeons are affiliated to many hospitals whom they worked with in the past or are presently working with. One surgeon can be affiliated to four to five hospitals at a time.
| Hospital Name (CCN) | State | Hospital Type |
| Ronald Reagan Ucla Medical Center (050262) | Los angeles, CA | Acute Care Hospital |
| Lac/harbor-ucla Med Center (050376) | Torrance, CA | Acute Care Hospital |
Group Practice:
Group practices are practice of medicine by a group of physicians who share their premises and other resources. Following list states all the group name
with which Dr. Courtney Ann O'brien is associated with along with the number of members in that group.
| Organization Name (Group PAC ID) | Members |
| The Regents Of The University Of California (1355248584) | 1018 |
Business Mailing Address:
Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned address.
| Address: | 5767 W Century Blvd Suite 400,
Los Angeles, California |
| Zip: | 90095-5631 |
| Phone Number: | 310-301-8707 |
| Fax Number: | 310-301-8751 |
Patients can reach Dr. Courtney Ann O'brien at
2655 1st St Ste 380, Simi Valley, California or can
call to book an appointment on 805-583-7640.
Comments/ Reviews:
Patients can read all the reviews posted for Dr. Courtney Ann O'brien below. You may also share your own experience like the quality of treatment, behavior, and overall care provided by Dr. Courtney Ann O'brien. It will help others make informed decisions.
** Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 13 October, 2025.