Accepting new patients

Susan C. Ahern, DO

  • Endocrinology
Average rating: 5.0
| 396 ratings
Thousand Oaks Primary & Specialty Care | 100 Moody Court, Suite 200, Thousand Oaks, CA 91360


Dr. Susan Ahern was born and raised in Orange County, California. She now lives with her husband and children in Ventura County. She completed her Internal Medicine Residency, Internal Medicine Chief Residency, and Endocrinology and Metabolism Fellowship at the University of California, Irvine. She is also board certified in Obesity Medicine by the American Board of Obesity Medicine. Her clinical interests include obesity medicine and is part of an insurance based weight loss program at UCLA called the Program for Reducing Obesity (PRO. Other clinical interests include diabetes mellitus, thyroid conditions including thyroid nodules and thyroid cancer, parathyroid conditions, pituitary conditions, gonadal disorders, and transgender medicine. In her spare, time she enjoys spending time with her husband and two children. Dr. Ahern strives to provide high quality, comprehensive, and evidence based care for her patients.




Medical Board Certifications

Obesity Medicine, American Board of Obesity Medicine, 2020
Endocrinology, Diabetes and Metabolism, American Board of Internal Medicine, 2017
Internal Medicine, American Board of Internal Medicine, 2014


Endocrinology Diabetes & Metabolism, UC Irvine School of Medicine, 2017


Chief Resident, UC Irvine School of Medicine, 2015
Internal Medicine, UC Irvine School of Medicine, 2014


DO, Western University of Health Sciences, 2011


  • LGBTQ ChampionsLGBTQ+ champion
  • Super Doctors® Southern California Rising Stars, 2024
  • Super Doctors® Southern California Rising Stars, 2021
  • Super Doctors® Southern California Rising Stars, 2020
  • See More

Hospital Affiliations

Ronald Reagan UCLA Medical Center


Meet Susan C. Ahern, DO





  1. Purdy AC1, Idriss A, Ahern S, Lin E, Elfenbein DM. Dr. Google: The Readability and Accuracy of Patient Education Websites for Graves’ Disease Treatment. Surgery. 2017 Nov;162(5):1148-1154. doi: 10.1016/j.surg.2017.07.01 Epub 2017 Aug 30. 
  2. Riestenberg C, Ahern S, Shamonki M. Follicle-stimulating hormone receptor autoantibody associated primary ovarian insufficiency successfully treated with corticosteroids: a case report. F S Rep. 2020 Sep 14;1(3):206-208. doi: 10.1016/j.xfre.2020.09.00 PMID: 34223245; PMCID: PMC8244256. 
  3. Wei J, Lei L, Shieh A, Gupta D, Ahern S, Shen N. Program for Reducing Obesity (PRO): An institutional review of an insurance-based weight loss program utilizing shared medical appointments. Obes Sci Pract. 2021 Sep 25;8(3):272-278. doi: 10.1002/osp4.564. PMID: 35664242; PMCID: PMC9159562. 


  1. Ahern S., Synopsis Osteoporosis Lecture by of Stewart Silverman California Chapter AACE meeting on Osteoporosis Drug Holidays published in the California Chapter of the AACE President’s Newsletter in November 2015. 
  2. Ahern S., and Mitchell G. Heraclitus Redux: Clinical Consequences of Licorice Ingestion, Once an Ancient Survival Strategy, Now Linked to Overindulgence in Modern Society. Proceedings of UCLA Health. Volume 22 (2018) 
  3. Rocco, V. And Ahern S., An Interesting Case of Hyperkalemia in a Patient with Normal Renal Function.  Proceedings of UCLA Health Volume 22 (2018) 
  4. Ahern S., Benjamin M, Ilarde A. Plasmacytoma Masquerading as a goiter. A Case Report.  Proceedings of UCLA Health Volume 24 (2020)


  1. Cox S.*, Kujak J, Princenthal R, and Bjelica D. "Skeletal and Extraskeletal Manifestations of Mixed Alpha and Beta Thalassemia”.  Radiology Case Reports (2012) Volume 7 (3) PMID 27326288 (*maiden name) 
  2. Ahern S., Daniels M, and Bhangoo M. LHX3 Deficiency in the United States with Severe Developmental Delay in a Child of Syrian Refugee Parents. Endocrinology Diabetes & Metabolism Case Reports Journal November 2018 DOI: 10.1530/EDM-18-0079                                                                


  1. Ahern S., Nguyen H, Lyou Y, Singh S and Wang PH.  Part 3: Case 56 Type B Insulin Resistance Syndrome.  Atypical Diabetes: Pathophysiology, Clinical Presentations and Treatment Options. 2018 Boris Draznin MD, PHD Editor, ADA publication 


  1. Shira Grock, M.D., Reema Patel, M.D., Susan Ahern D.O. Hormone Therapy for Transgender and Gender- Diverse Patients 


  1. The Program for Reducing Obesity (PRO): Two-Year Weight Loss Outcomes" submitted to Obesity Week 2022 in November 2022


  1. Institutional Review of a Weight Loss Program Utilizing Shared Medical Appointments to Treat Obesity. Obesity Week 2020- Poster 253.  Jeffrey Wei, MD, Albert Shieh, MD, Deepashree Gupta, MD, Susan Ahern, DO, Na Shen, MD  


  • Aetna
  • Anthem Blue Cross
  • Blue Shield of California
  • Centivo
  • Cigna
  • First Health
  • Health Net of California
  • Interplan (part of HealthSmart)
  • L.A. Care
  • MultiPlan
  • UFCM Health System
  • Prime Health Services
  • Private Healthcare Systems (PHCS)
  • 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.


  • Super Doctors® Southern California Rising Stars, 2024
  • Super Doctors® Southern California Rising Stars, 2021
  • Super Doctors® Southern California Rising Stars, 2020
  • Super Doctors® Southern California Rising Stars, 2019