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John M. Gilbert, MD
Practice accepting new patients.

John M. Gilbert, MD

(714) 446-5640
Primary Specialties
  • Endocrinology
    (Board Certified)
  • Endocrinology Metabolic and Hormonal Imbalances
    (Board Certified)
Secondary Specialties
  • Internal Medicine
    (Board Certified)
Medical Groups & Affiliations
  • St. Jude Affiliated Physician
  • St. Jude Heritage Medical Group
  • Additional Languages Spoken

Primary Office

100 East Valencia Mesa Drive
Suite 105
Fullerton, CA 92835
(714) 446-5640
(714) 446-5468
Recommend this Physician
4.7 out of 5 (227 Ratings | 42 Comments)


Dr Gilbert is easy to talk to but sometimes doesn't hear me and help me with answers
Excellent dr. gave me a recommendation for a good primary care dr. ordered tests etc.
I saw Dr. Gilbert for a specific long term condition. It needs to be observed and Dr. Gilbert does a good job keeping control over it. 3 days before my visit I was struck with an unrelated pain that really was outside the area of why I am seeing Dr. Gilbert. I was not able to get an appointment with my general practitioner, but Dr. Gilbert took excellent care of this issue, as he checked my records and prescribed the medication that I needed to address the new condition. In addition, he also addressed the purpose of my originally planned visit.
I needed a referral for a colonoscopy and did not receive it after appt. Extra step to call office to do so. *Dr. Gilbert is awesome!!
He's always very respectful and informative. He's been my indocronoligst for over 20 years and that's what I keep going to hom!
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Physician Bio

A love of teaching and a desire to help people live happier and healthier lives inspired me to become a physician. I care for the person as well as the disease, and my work in clinical research trials ensures patients have access to the newest treatment options. Over the years I have found that successful treatment is a result of working in partnership with my patients. Together, we can prevent a variety of conditions and related complications, as well as achieve a healthier lifestyle.

To further advance the treatment of endocrine disorders, I serve as Medical Director of Clinical Trials at St. Jude Heritage Healthcare, speak nationally on the latest innovations, and participate on St. Jude Medical Center’s committee to improve diabetes care.


  • Medical School:
    Downstate Medical School
  • Internship:
    St. Mary's Hospital
  • Residency:
    St. Mary's Hospital
  • Fellowship:
    State University of New York at Stonybrook
  • Board Certified in Internal Medicine
  • Board Certified in Endocrinology
  • Board Certified in Endocrinology Metabolic and Hormonal Imbalances

Areas of Interest

Adrenal Disorders, Diabetes, Hyperlipidemia, Hypertension (High Blood Pressure), lipid management, Menopause, Metabolism, Obesity, Osteoporosis, Weight Management, Thyroid, Adrenal and Pituitary Disorders, Sex Hormone Disorders, Hypogonadism, Hypoglycemia, Hypercalcemia, Hypocalcemia, Hyperparathyroidism, Acromegly, Cushing's Syndrome

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